WO2020129786A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2020129786A1 WO2020129786A1 PCT/JP2019/048561 JP2019048561W WO2020129786A1 WO 2020129786 A1 WO2020129786 A1 WO 2020129786A1 JP 2019048561 W JP2019048561 W JP 2019048561W WO 2020129786 A1 WO2020129786 A1 WO 2020129786A1
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- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/08—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind
- H01L27/085—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only
- H01L27/088—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate
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- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
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- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- H01L21/823487—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type with a particular manufacturing method of vertical transistor structures, i.e. with channel vertical to the substrate surface
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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Definitions
- the present disclosure relates to a semiconductor device, and particularly to a chip size package type semiconductor device.
- Patent Document 1 a semiconductor device mounted on a mounting board and switching between a conducting state and a non-conducting state of a current path in the mounting board.
- the current path through which a large current flows on the mounting board is designed to reduce the conduction resistance. Therefore, it is desired that the semiconductor device mounted on the mounting substrate, which switches between the conductive state and the non-conductive state of the current path through which the large current flows, has characteristics suitable for reducing the conduction resistance of the current path.
- an object of the present disclosure is to provide a semiconductor device having characteristics suitable for reducing the conduction resistance of a current path in a mounting board to be mounted.
- a semiconductor device is a chip size package type semiconductor device capable of face-down mounting, and includes a semiconductor layer, a metal layer formed in contact with a back surface of the semiconductor layer, and the semiconductor.
- a first vertical MOS transistor formed in a first region of the layer, and a first vertical MOS transistor formed in a second region of the semiconductor layer adjacent to the first region in plan view of the semiconductor layer.
- Two vertical MOS transistors, the semiconductor layer has a semiconductor substrate, and each of the first vertical MOS transistor and the second vertical MOS transistor has a surface of the semiconductor layer.
- the plurality of first source pads between the first side parallel to the direction and closest to the first side, and between the boundary between the first region and the second region in the first direction.
- the second gate pad is arranged between the second side and the second side that is parallel and closest to the first direction, and The semiconductor device is arranged such that the plurality of second source pads are not sandwiched between the boundary and the boundary in the first direction.
- the semiconductor device According to the semiconductor device according to one aspect of the present disclosure, it is possible to provide a semiconductor device having characteristics suitable for reducing the conduction resistance of the current path in the mounting board to be mounted.
- FIG. 1 is a sectional view showing an example of the structure of the semiconductor device according to the embodiment.
- FIG. 2A is a top view showing an example of an electrode configuration of the semiconductor device according to the exemplary embodiment.
- FIG. 2B is a cross-sectional view showing a main current flowing through the semiconductor device according to the embodiment.
- FIG. 3 is a circuit diagram showing an application example of the semiconductor device according to the embodiment to a charge/discharge circuit.
- FIG. 4A is a schematic diagram Part 1 showing the relationship between the semiconductor device according to the embodiment, the printed wiring board according to the embodiment, and the wiring pattern on the printed wiring board.
- FIG. 4B is a schematic diagram 2 showing the relationship between the semiconductor device according to the embodiment, the printed wiring board according to the embodiment, and the wiring pattern on the printed wiring board.
- FIG. 5A is a schematic diagram 1 showing the relationship between the semiconductor device according to the first comparative example, the printed wiring board according to the first comparative example, and the wiring pattern on the printed wiring board.
- FIG. 5B is a second schematic diagram showing the relationship between the semiconductor device according to the first comparative example, the printed wiring board according to the first comparative example, and the wiring pattern on the printed wiring board.
- FIG. 6A is a schematic diagram showing how a current flows through the printed wiring board according to the embodiment.
- FIG. 6B is a schematic diagram showing how a current flows in the printed wiring board according to the second comparative example.
- FIG. 7A is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 7B is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 7C is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 7D is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 7E is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 7F is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 7G is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 8A is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 8B is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 8C is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 8D is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 9A is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 9B is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 10 is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 11 is a circuit diagram showing an example of the semiconductor device according to the embodiment.
- FIG. 12 is a cross-sectional view showing an example of the structure of the semiconductor device according to the embodiment.
- FIG. 13 is a top perspective view of the bidirectional Zener diode according to the embodiment.
- FIG. 14 is a cross-sectional view of the bidirectional Zener diode according to the embodiment.
- FIG. 15 is a schematic diagram showing a typical path of a surge current flowing through the semiconductor device according to the embodiment.
- FIG. 16 is a cross-sectional view showing a state where the semiconductor device according to the embodiment is warped.
- FIG. 17 is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 18A is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 18B is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 18C is a schematic diagram showing an arrangement example of source electrodes of the semiconductor device according to the first embodiment.
- FIG. 18D is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 18E is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 19 is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 20A is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- FIG. 20B is a schematic diagram showing an arrangement example of electrode pads of the semiconductor device according to the first embodiment.
- the semiconductor device according to the embodiment is a chip size package (CSP) type semiconductor device in which two vertical MOS (Metal Oxide Semiconductor) transistors are formed on a semiconductor substrate and face down mounting is possible.
- the two vertical MOS transistors are power transistors, and are so-called trench MOS FETs (Field Effect Transistors).
- FIG. 1 is a sectional view showing an example of the structure of a semiconductor device 1 according to an embodiment.
- FIG. 2A is a top view showing an example of the electrode configuration of the semiconductor device 1.
- FIG. 2B is a cross-sectional view showing the main current flowing through the semiconductor device 1.
- the main current is the main component of the current flowing in the circuit, is the current flowing in the designed direction of the designed current path, and excludes leakage current and surge current.
- the semiconductor device 1 when captured inside the semiconductor device 1, it means a current flowing through a path indicated by a bidirectional arrow in FIG. 2B.
- the semiconductor device 1 is viewed in a plan view, the inside of the semiconductor device 1 is horizontally oriented.
- a flowing current that is, a current flowing horizontally in the metal layer 30 or the semiconductor substrate 32 in FIG. 2B.
- FIG. 4B when the printed wiring board 50 including the mounted semiconductor device 1 and the wiring patterns 51 to 53 are seen in a plan view, it means a current flowing from left to right or right to left.
- 1 and 2B show a cross section taken along the line II of FIG. 2A.
- the semiconductor device 1 includes a semiconductor layer 40, a metal layer 30, and a first vertical MOS transistor 10 (hereinafter, referred to as a first vertical MOS transistor 10 formed in a first region A1 in the semiconductor layer 40).
- Transistor 10 and a second vertical MOS transistor 20 (hereinafter also referred to as “transistor 20") formed in the second region A2 in the semiconductor layer 40.
- the first region A1 and the second region A2 are adjacent to each other in a plan view of the semiconductor layer 40.
- the semiconductor layer 40 is configured by stacking a semiconductor substrate 32 and a low concentration impurity layer 33.
- the semiconductor substrate 32 is arranged on the back surface side of the semiconductor layer 40 and is made of silicon containing impurities of the first conductivity type.
- the low-concentration impurity layer 33 is disposed on the front surface side of the semiconductor layer 40 and is formed in contact with the semiconductor substrate 32.
- the low-concentration impurity layer 33 has a first-conductivity-type impurity concentration lower than that of the semiconductor substrate 32. Including.
- the low-concentration impurity layer 33 may be formed on the semiconductor substrate 32 by epitaxial growth, for example.
- the metal layer 30 is formed in contact with the back surface side of the semiconductor layer 40 and is made of silver (Ag) or copper (Cu).
- the metal layer 30 may contain a small amount of an element other than the metal mixed as an impurity in the manufacturing process of the metal material. Further, the metal layer 30 may or may not be formed on the entire back surface side of the semiconductor layer 40.
- the transistor 10 is bonded to the surface of the semiconductor layer 40 (that is, the surface of the low-concentration impurity layer 33) to the mounting substrate via a bonding material during face-down mounting. It has a plurality of (here, six) first source pads 111 (here, first source pads 111a, 111b, 111c, 111d, 111e, and 111f) and a first gate pad 119.
- the transistor 20 includes a plurality of (six in this case) second electrodes that are bonded to the surface of the semiconductor layer 40 (that is, the surface of the low-concentration impurity layer 33) to the mounting substrate via a bonding material during face-down mounting.
- Source pad 121 here, second source pads 121a, 121b, 121c, 121d, 121e, and 121f
- a second gate pad 129 here, second gate pad 129.
- the semiconductor layer 40 has a rectangular shape in a plan view, and the transistor 10 and the transistor 20 are arranged in the first direction in the first direction.
- the main current flows in the direction.
- the semiconductor layer 40 has one long side 91 and the other long side 92 parallel to the first direction, and one short side 93 and the other short side in the direction orthogonal to the first direction in a plan view. It is assumed to be rectangular with sides 94. That is, here, the semiconductor layer 40 is assumed to have a rectangular shape with the long side in the first direction.
- a center line 90 is a line that bisects the rectangular semiconductor layer 40 in the first direction in a plan view of the semiconductor layer 40. Therefore, the center line 90 is a straight line in the direction orthogonal to the first direction in the plan view of the semiconductor layer 40. As will be described later, when the semiconductor device 1 is mounted face down on the printed wiring board, the center line 90 is located at a position (clearance) where the wiring pattern is once cut off on the printed wiring board in a plan view of the semiconductor layer 40. It will almost match.
- the boundary 90C is a boundary between the first area A1 and the second area A2.
- the boundary 90C divides the semiconductor layer 40 into two equal areas in a plan view of the semiconductor layer 40, but is not necessarily a straight line. In a plan view of the semiconductor layer 40, the center line 90 and the boundary 90C may or may not match.
- the first gate pad 119 has a plurality of first gate pads 119 between one long side 91 and the boundary 90C in the first direction in a plan view of the semiconductor layer 40.
- the source pad 111 of No. 1 is arranged so as not to be sandwiched even in part.
- the plurality of first source pads 111 include a plurality of substantially rectangular-shaped ones (here, all the first source pads 111) in a plan view of the semiconductor layer 40.
- the source pads 111 each have a longitudinal direction parallel to the one long side 91 and the other long side 92, and are arranged in a stripe shape.
- the second gate pad 129 has a plurality of second source pads 121 between the other long side 92 and the boundary 90C in the first direction in the plan view of the semiconductor layer 40. It is arranged so that it will not be pinched even by parts.
- the plurality of second source pads 121 include a plurality of substantially rectangular-shaped ones (here, all the second source pads 121) in a plan view of the semiconductor layer 40, and the plurality of substantially rectangular-shaped second source pads 121.
- the source pads 121 each have a longitudinal direction parallel to one long side 91 and the other long side 92, and are arranged in a stripe shape.
- the number of the first gate pads 119 and the number of the second gate pads 129 are not necessarily limited to one illustrated in FIG. 2A, and may be two or more. I do not care. Further, each of the first gate pad 119 and the second gate pad 129 may have a substantially circular shape as illustrated in FIG. 2A, or may not have a substantially circular shape.
- the number of the plurality of first source pads 111 and the number of the plurality of second source pads 121 are not necessarily limited to the six illustrated in FIG. 2A, and other than six. It may be plural.
- the plurality of substantially rectangular first source pads 111 are not limited to the arrangement as shown in FIG. 2A, and are parallel to one short side 93 and the other short side 94, and may be arranged in a stripe shape.
- the plurality of substantially rectangular second source pads 121 are not limited to the arrangement as shown in FIG. 2A, and are parallel to one short side 93 and the other short side 94, and are arranged in a stripe shape. May be.
- a first body region 18 containing impurities of a second conductivity type different from the first conductivity type is formed in the first body region 18.
- a first source region 14 containing a first conductivity type impurity, a first gate conductor 15, and a first gate insulating film 16 are formed in the first body region 18.
- the first source electrode 11 includes a portion 12 and a portion 13, and the portion 12 is connected to the first source region 14 and the first body region 18 via the portion 13.
- the first gate conductor 15 is electrically connected to the first gate pad 119.
- the portion 12 of the first source electrode 11 is a layer that is joined to solder during reflow in face-down mounting, and as a non-limiting example, a metal material containing any one or more of nickel, titanium, tungsten, and palladium. May be composed of The surface of the portion 12 may be plated with gold or the like.
- the portion 13 of the first source electrode 11 is a layer that connects the portion 12 and the semiconductor layer 40, and as a non-limiting example, is made of a metal material containing at least one of aluminum, copper, gold, and silver. It may be configured.
- a second body region 28 containing an impurity of the second conductivity type is formed in the second region A2 of the low concentration impurity layer 33.
- a second source region 24 containing an impurity of the first conductivity type is formed in the second body region 28 .
- the second source electrode 21 is composed of a portion 22 and a portion 23, and the portion 22 is connected to the second source region 24 and the second body region 28 via the portion 23.
- the second gate conductor 25 is electrically connected to the second gate pad 129.
- the portion 22 of the second source electrode 21 is a layer that is joined to solder during reflow in face-down mounting, and as a non-limiting example, a metal material containing one or more of nickel, titanium, tungsten, and palladium. May be composed of The surface of the portion 22 may be plated with gold or the like.
- the portion 23 of the second source electrode 21 is a layer that connects the portion 22 and the semiconductor layer 40, and as a non-limiting example, is a metal material containing one or more of aluminum, copper, gold, and silver. It may be configured.
- the low-concentration impurity layer 33 and the semiconductor substrate 32 function as a common drain region in which the first drain region of the transistor 10 and the second drain region of the transistor 20 are shared. To do.
- the semiconductor device 1 has a bidirectional path from the first source electrode 11 to the second source electrode 21 via the first drain region, the metal layer 30, and the second drain region. Is the main current path.
- the first body region 18 is covered with an interlayer insulating layer 34 having an opening, and the first source electrode 11 connected to the first source region 14 through the opening of the interlayer insulating layer 34. Is provided.
- the interlayer insulating layer 34 and the portion 13 of the first source electrode are covered with a passivation layer 35 having an opening, and the portion 12 connected to the portion 13 of the first source electrode through the opening of the passivation layer 35 is provided. ..
- the second body region 28 is covered with an interlayer insulating layer 34 having an opening, and a portion 23 of the second source electrode 21 connected to the second source region 24 is provided through the opening of the interlayer insulating layer 34.
- the interlayer insulating layer 34 and the portion 23 of the second source electrode are covered with a passivation layer 35 having an opening, and a portion 22 connected to the portion 23 of the second source electrode through the opening of the passivation layer 35 is provided. ..
- the plurality of first source pads 111 and the plurality of second source pads 121 are regions in which the first source electrode 11 and the second source electrode 21 are partially exposed on the surface of the semiconductor device 1, respectively. Refers to the so-called terminal part.
- the first gate pad 119 and the second gate pad 129 are respectively the first gate electrode 19 (not shown in FIGS. 1, 2A, and 2B; see FIG. 3 described later) and the first gate electrode 19 respectively.
- the second gate electrode 29 (not shown in FIGS. 1, 2A, and 2B; see FIG. 3, which will be described later) indicates a region that is partially exposed on the surface of the semiconductor device 1, that is, a so-called terminal portion.
- the source pad and the gate pad are collectively referred to as "electrode pad”.
- each structure in the semiconductor device 1 is that the thickness of the semiconductor layer 40 is 10-90 ⁇ m, the thickness of the metal layer 30 is 10-90 ⁇ m, the interlayer insulating layer 34 and the passivation layer. The sum of the thicknesses of 35 is 3-13 ⁇ m.
- the semiconductor device 1 for example, assuming that the first conductivity type is N type and the second conductivity type is P type, the first source region 14, the second source region 24, the semiconductor substrate 32, and the low concentration impurity layer 33 are The first body region 18 and the second body region 28 may be N-type semiconductors and may be P-type semiconductors.
- the first conductivity type is P-type and the second conductivity type is N-type
- the first source region 14, the second source region 24, the semiconductor substrate 32, and the low-concentration impurity layer. 33 may be a P-type semiconductor
- the first body region 18 and the second body region 28 may be an N-type semiconductor.
- the conduction operation of the semiconductor device 1 will be described in the case where the transistors 10 and 20 are so-called N-channel transistors in which the first conductivity type is N type and the second conductivity type is P type.
- a high voltage is applied to the first source electrode 11 and a low voltage is applied to the second source electrode 21, and the second gate electrode 29 (second gate conductor 25
- a voltage higher than the threshold value is applied to ()
- a conduction channel is formed in the second body region 28 near the second gate insulating film 26.
- the first source electrode 11-first body region 18-low-concentration impurity layer 33-semiconductor substrate 32-metal layer 30-semiconductor substrate 32-low-concentration impurity layer 33-second body region 28 is formed.
- the main current flows through the path of the conductive channel-the second source region 24-the second source electrode 21 to bring the semiconductor device 1 into the conductive state.
- This main current path there is a PN junction on the contact surface between the first body region 18 and the low-concentration impurity layer 33, which functions as a body diode. Further, since this main current mainly flows through the metal layer 30, by thickening the metal layer 30, the cross-sectional area of the main current path is expanded, and the on-resistance of the semiconductor device 1 can be reduced.
- This conductive state is a state corresponding to charging in FIG. 3 described later.
- a high voltage is applied to the second source electrode 21 and a low voltage is applied to the first source electrode 11, and the first gate electrode 19 (the first source electrode 11 is used as a reference).
- a voltage higher than the threshold value is applied to the gate conductor 15
- a conduction channel is formed in the first body region 18 near the first gate insulating film 16.
- the second source electrode 21, the second body region 28, the low concentration impurity layer 33, the semiconductor substrate 32, the metal layer 30, the semiconductor substrate 32, the low concentration impurity layer 33, and the first body region 18 are formed.
- the main current flows through the path of the conductive channel, the first source region 14 and the first source electrode 11 to bring the semiconductor device 1 into the conductive state.
- this main current path there is a PN junction on the contact surface between the second body region 28 and the low-concentration impurity layer 33, which functions as a body diode.
- This conductive state corresponds to the discharge in FIG. 3 described later.
- FIG. 3 is a circuit diagram showing an application example of the semiconductor device 1 to a charging/discharging circuit used in a lithium-ion battery pack such as a smartphone or a tablet.
- the semiconductor device 1 includes a discharge operation from the battery 3 to the load 4 and a load from the load 4 to the battery 4 according to a control signal given from the control IC 2 to the first gate electrode 19 and the second gate electrode 29.
- the charging operation to 3 is controlled.
- the ON resistance of the semiconductor device 1 is an example because of restrictions on shortening the charging time and realizing rapid charging.
- a 20V withstand voltage specification 2.2 to 2.4 m ⁇ or less is required.
- the semiconductor device 1 is used by being mounted face down on a printed wiring board which is a mounting board.
- FIGS. 4A and 4B show the relationship between the semiconductor device 1, the printed wiring board 50, and the wiring patterns 51 to 53 arranged on the printed wiring board 50 when the semiconductor device 1 is mounted on the printed wiring board 50. It is a schematic diagram.
- the first transistor and the second transistor are referred to as FET1 and FET2, respectively.
- Wiring patterns 51 to 53 are arranged on the printed wiring board 50 based on an arbitrary design. However, in charging/discharging of a smart phone, a tablet, etc. in which a lithium ion battery pack is mainly used, the discharging operation from the battery and the battery are performed. In order to control the charging operation to the ON/OFF of the current, the wiring patterns 51 to 53 arranged on the printed wiring board 50 sandwich the clearance (separation) 54 so that the semiconductor device 1 bridges the clearance 54. To be implemented. In FIG. 4B, the wiring patterns 51 and 53 sandwich the clearance 54 at the center position in the figure.
- each of the plurality of first source pads 111a to 111f and the plurality of first mounting source pads 511a to 511a to Each of 511f is joined via a conductive joining material such as solder.
- the plurality of first mounting source pads 511a to 511f may be simply referred to as “a plurality of first mounting source pads 511”.
- each of the plurality of second source pads 121a to 121f and each of the plurality of second mounted source pads 521a to 521f arranged on the wiring pattern 53 corresponding thereto are It is joined via a conductive joining material such as solder.
- the plurality of second mounting source pads 521a to 521f may be simply referred to as "a plurality of second mounting source pads 521".
- solder is used as the conductive bonding material.
- solder is used as a joining material, reflow mounting is performed and heat treatment at about 250° C. is performed.
- the main current flowing through the wiring patterns 51 and 53 on the printed wiring board 50 is assumed to flow from left to right in FIG. 4B (corresponding to charging in FIG. 3). 4B and FIG. 3 will be described.
- the main current is schematically shown by a white arrow.
- the wiring connecting the battery 3 and the first source electrode 11 of the semiconductor device 1 corresponds to the wiring pattern 51 of FIG. 4B.
- the wiring pattern 51 is connected to the first source electrode 11 via the plurality of first mounting source pads 511, the solder, and the plurality of first source pads 111.
- the wiring connecting from the control IC 2 to the first gate electrode 19 (second gate electrode 29) of the semiconductor device 1 in FIG. 3 corresponds to the wiring pattern 52 of FIG. 4B.
- the wiring pattern 52 passes through the first mounting gate pad 519 (second mounting gate pad 529), the solder, the first gate pad 119 (second gate pad 129), and then the first gate electrode 19 ( It is connected to the second gate electrode 29).
- the wiring connecting the second source electrode 21 of the semiconductor device 1 to the load 4 corresponds to the wiring pattern 53 of FIG. 4B.
- the wiring pattern 53 is connected to the load 4 from the second source electrode 21 via the plurality of second source pads 121, the solder, and the plurality of second mounting source pads 521.
- the printed wiring board 50 on which the semiconductor device 1 is mounted and the wiring patterns 51 to 53.
- the semiconductor device 1 is mounted so as to bridge the wiring patterns 51 and 53 that sandwich the clearance 54.
- the main current path of the semiconductor device 1 is opened and current flows in the wiring patterns 51 and 53 on the printed wiring board 50.
- the semiconductor device 1 becomes functionally the same as a resistor and a heating element. Therefore, in applications such as those used in lithium-ion battery packs for smartphones, tablets, etc. that are expected to remain on for a long time, the conduction resistance of the main current path of the circuit can be reduced. It is important from the viewpoint of low power consumption of the circuit and improvement of heat dissipation. For this reason, it is desirable to prevent intervening resistors from interfering with the main current path of the circuit.
- the resistance of the entire circuit including the semiconductor device 1 at the time of conduction is referred to as conduction resistance
- the resistance limited to the internal resistance of the semiconductor device 1 in the ON state is referred to as ON resistance.
- the power line is a straight line having almost the same width as the wiring patterns 51 and 53 when the current flows through the wiring patterns 51 and 53, and the current exceeds the clearance 54 (in the semiconductor device 1).
- the semiconductor device 1 becomes a straight line having a width substantially the same as the short side length (side length parallel to the direction orthogonal to the main current flowing direction).
- it is necessary to design the power line as wide as possible and to avoid placing obstacles such as resistors in the power line as much as possible.
- the transistor 10 (or the first region A1) and the transistor 20 (or the second region A2) are adjacent to each other in a plan view in the direction in which the main current flows. It is desirable to design the device in Therefore, the boundary 90C is a direction substantially orthogonal to the direction in which the main current flows, and even if the boundary 90C does not completely coincide with the center line 90, there are many overlapping portions.
- FIGS. 5A and 5B show the semiconductor device according to the first comparative example and the first comparative example when the semiconductor device according to the first comparative example is mounted on the printed wiring board according to the first comparative example. It is a schematic diagram which shows the relationship with the printed wiring board which concerns, and the wiring patterns 1051 and 1053 arrange
- the transistor 1010 (or the first region A1001) and the transistor 1020 (or the first region A1001) are arranged in a direction orthogonal to the direction of the main current flowing from left to right. 2A, the current flowing from the left in the wiring pattern 1051 is orthogonal to once in the semiconductor device according to the first comparative example, as shown in FIG. 5B.
- the wiring pattern 1053 bends in the direction and flows again, and the direction of the wiring pattern 1053 is changed again by 90°.
- FIG. 4B in the case of FIG.
- the width of the wiring pattern 1051 and 1053 must be formed by dividing the limited width of the printed wiring board according to the first comparative example into two. That is, the width of the power line cannot be increased sufficiently. Therefore, it is desirable that the transistor 10 (or the first area A1) and the transistor 20 (or the second area A2) are adjacent to each other in the direction in which the main current flows in a plan view.
- the point that the resistor is not arranged in the power line as much as possible is the main point of the present disclosure, and the semiconductor device 1 and the semiconductor device according to the second comparative example are compared with each other with reference to FIGS. The effect of No. 1 will be described.
- the second comparative example is a typical one of the conventional examples.
- FIG. 6A is a schematic diagram showing how a main current flows through a printed wiring board 50 on which the semiconductor device 1 is mounted.
- the main current flowing through the wiring patterns 51 and 53 on the printed wiring board 50 flows from left to right in FIG. 6A.
- FIG. 6B is a schematic diagram showing how a main current flows in a printed wiring board according to a second comparative example in which a semiconductor device according to the second comparative example is mounted.
- the main current flowing through the wiring patterns 1151 and 1153 on the printed circuit board according to the second comparative example flows from left to right in FIG. 6B.
- the semiconductor device 1 and the semiconductor device according to the second comparative example have the same chip size.
- the first gate pad 119 and the second gate pad 129 are arranged near one long side 91 and the other long side 92, respectively.
- the first gate pad 1119 and the second gate pad 1129 are respectively located at the center of one short side 1193 and the other short side 1194 in a plan view of the semiconductor layer. The difference is that they are located in the vicinity.
- the total area of the plurality of first source pads 111 and the total area of the plurality of first source pads 1111 are equal to each other, and the plurality of second source pads The total area of 121 and the total area of the plurality of second source pads 1121 are equal. Therefore, the difference in the total area of the plurality of source pads between the semiconductor device 1 and the semiconductor device according to the second comparative example does not affect the on-resistance. Other than that, there are no structural differences or differences that affect the device functions or characteristics.
- the gate electrode (or gate pad) of the semiconductor device 1 and the semiconductor device according to the second comparative example (hereinafter, when they are not distinguished from each other, they are also simply referred to as “semiconductor device”) and the vicinity thereof
- the region is provided with a control function of passing a current through the main current path in the semiconductor device.
- the main current path the active region (in the broken line in FIG. 1 in the semiconductor device 1)
- the region must be regarded as a conduction failure region that erodes the main current path (active region (inside the broken line in FIG. 1 in the semiconductor device 1)) as a control function portion. That is, the gate electrode and the region in the vicinity thereof are indispensable regions for the function of the semiconductor device, but on the other hand, they are regions which are desired to be reduced in order to reduce the on-resistance.
- the first gate pad 1119 and the second gate pad 1129 have power levels. It is located in the center of the line and is an obstacle to continuity.
- the main current flowing in the entire width of the wiring pattern 1151 from the left side of the drawing shows that the first gate pad 1119 has a power line width less than that of the power line. Because it is centrally located, the flow is disrupted to avoid this (see Figure 6B).
- the divided main current merges in the vicinity of the center of the semiconductor device according to the second comparative example, but the second gate pad 1129 is arranged in the center of the width of the power line, and thus the divided main current flows again. , I will go to the right side of the drawing.
- the first gate pad 119 and the second gate pad 129 are arranged closer to the end of the power line, which is less likely to be an obstacle to conduction.
- the main current flowing in the entire width of the wiring pattern 51 from the left of the drawing is that the first gate pad 119 and the second gate pad 129 are at the end of the power line.
- the flow is not disrupted due to the fact that it is located closer to (see FIG. 6A).
- the main current flows from the left side to the right side of the drawing without being disturbed at all, except for the limitation of the width of the short side of the semiconductor device 1, while keeping the flow roughly.
- the semiconductor device 1 is less effective in hindering the flow of the main current than the semiconductor device according to the second comparative example, and is more effective in suppressing an increase in conduction resistance. ..
- first gate pad 119 and the second gate pad 129 are near the end of the power line means that the first gate pad 119 and the second gate pad 129 are the first gate pad of the semiconductor device 1, respectively.
- the plurality of first source pads 111 and the plurality of second source pads 121 are arranged between the one long side 91 and the other long side 92 that are parallel to the direction without being partially sandwiched. Refers to.
- the first gate pad 119 is not only close to the end of the power line, but also the plurality of other first sources are formed between the first gate pad 119 and the boundary 90C in the first direction.
- the pads 111 are arranged so as not to sandwich them.
- the second gate pad 129 is not only close to the end of the power line, but also the second source pad 121 is not sandwiched between the second gate pad 129 and the boundary 90C in the first direction. It is located in. That is, in the plan view of the semiconductor device 1, each of the first gate pad 119 and the second gate pad 129 is arranged near the boundary 90C. With such an arrangement, the effect of impeding the linear flow of the main current is geometrically less than that in the case where the gate pad is arranged at another position. Therefore, the effect of suppressing an increase in conduction resistance can be obtained.
- the inventor obtained the above findings by earnestly examining and conducting experiments. Then, based on the above knowledge, the present invention has arrived at a semiconductor device 1 that is effective in reducing the conduction resistance throughout the circuit.
- the semiconductor device 1 is a chip size package type semiconductor device capable of face-down mounting, and includes a semiconductor layer, a metal layer formed in contact with the back surface of the semiconductor layer, and a first semiconductor layer in the semiconductor layer.
- a first vertical MOS transistor formed in a region and a second vertical MOS transistor formed in a second region adjacent to the first region in the semiconductor layer in a plan view of the semiconductor layer.
- the semiconductor layer has a semiconductor substrate, and each of the first vertical MOS transistor and the second vertical MOS transistor is mounted face down on the surface of the semiconductor layer.
- the semiconductor layer functions as a common drain region of the vertical MOS transistor and the second vertical MOS transistor, the semiconductor layer has a rectangular shape in the plan view, and the first vertical MOS transistor and the second vertical MOS transistor are provided.
- MOS transistors are arranged in the first direction, a main current flows in the first direction, and the first gate pad is parallel to and closest to the first direction among the four sides of the semiconductor layer.
- a part of the plurality of first source pads is sandwiched between the first side and the boundary between the first region and the second region in the first direction.
- the second gate pad is arranged so as not to exist between the second side which is parallel to and closest to the first direction among the four sides of the semiconductor layer, and the first direction.
- the plurality of second source pads are arranged so as not to be partially sandwiched between the boundary and the boundary.
- the first gate pad 119 and the second gate pad 129 which are main-current control function portions, which become obstacles in the power line, are located near the end of the power line. Since the main current is not divided and flows, it is effective in suppressing an increase in conduction resistance.
- first gate pad 119 and the second gate pad 129 are respectively arranged in the vicinity of the boundary 90C, the action of impeding the linear flow of the main current as compared with the case where the gate pads are provided at other positions Is geometrically less, and there is less risk of unnecessarily increasing conduction resistance.
- 7A to 7G, 8A to 8D, 9A, and 9B are schematic diagrams showing an example of the arrangement of electrode pads that satisfy the conditions of the semiconductor device 1 having the above configuration.
- the semiconductor layer 40 may have a substantially square shape.
- the terms long side and short side do not hold in the semiconductor layer 40, but the first direction, which is the direction in which the transistor 10 (or the first area A1) and the transistor 20 (or the second area A2) are aligned, And the relationship with the arrangement of the electrode pads of the semiconductor device 1 will be described using the expression "direction orthogonal to the first direction".
- the semiconductor device 1 may be configured such that the second side is a side facing the first side. preferable.
- the main current of the semiconductor device 1 has bidirectional paths, if the transistor 10 and the transistor 20 are arranged in line-symmetrical or point-symmetrical electrode pads, the conduction characteristics in the forward and reverse directions of the main current and The above configuration is preferable because it is possible to obtain the effect that the heat generation characteristics are less likely to be biased. For example, if a lithium-ion battery pack such as a smart phone or a tablet is equipped with a circuit that uses the semiconductor device 1, it is not necessary to make any special handling difference in both charging and discharging.
- the first gate pad 119 and the second gate pad 129 which are the main current control function portions, are arranged in the vicinity of the center line 90 (in particular, immediately above the center line). It is also possible to do.
- the main current path active region, inside the broken line in FIG. 1 is originally formed. Since the unfilled region can be used as a region for arranging the gate pad, the rate of erosion of the active region can be suppressed as compared with the case where the gate pad is arranged at other positions. The effect makes it possible to reduce the on-resistance. Further, the effect of suppressing heat generation by reducing the on-resistance can be expected.
- the semiconductor device 1 having the above configuration there is an effect of further reducing the on-resistance of the semiconductor device 1.
- a slightly wider space is provided in the boundary 90C between the first area A1 and the second area A2. It is natural to design an empty arrangement.
- the semiconductor device 1 having the above-described configuration since the space where nothing is originally provided is effectively used to provide the gate pad, the area that the source pad can occupy is different. It will increase in parts. Therefore, the total area of the plurality of first source pads 111 and the plurality of second source pads 121 can be increased accordingly. That is, the effect of reducing the on-resistance can be enjoyed.
- the plurality of first source pads 111 and the plurality of second source pads 121 may be further divided into a plurality in the longitudinal direction.
- the effect of reducing problems such as solder squeeze out during mounting is improved.
- the effect of facilitating the penetration of the underfill material described later can be obtained.
- the total area of the plurality of first source pads 111 and the total area of the plurality of second source pads 121 is excessively reduced, the side effect of increasing the on-resistance appears. Therefore, whether or not to divide the plurality of first source pads 111 and the plurality of second source pads 121 into a plurality of pieces in the longitudinal direction is a trade-off relationship between reduction of on-resistance and reduction of mounting defects.
- FIGS. 7A to 7D show an example of a configuration in which the boundary 90C is present at a position that does not coincide with the center line 90, the position of the boundary 90C is not limited to that shown in FIGS. 7A to 7D. It is not necessary to be limited to the position of.
- first gate pads 119 and second gate pads 129 there may be a plurality of first gate pads 119 and second gate pads 129, respectively.
- One or more first gate pads 119 two first gate pads 119A and first gate pads 119B in FIG. 7D
- one or more second gate pads 129 in FIG. 7D, Each of the second gate pad 129A and the second gate pad 129B.
- the plurality of first gate pads 119 are respectively provided between the first gate pad 119 and a side of the semiconductor layer 40 parallel to the first direction, or in the first direction. It is important to dispose a plurality of first source pads 111 so as not to be sandwiched between the first source pad 111 and the boundary 90C, but it is disposed so as to sandwich other first gate pads 119. It doesn't matter.
- the plurality of second gate pads 129 are respectively provided between the sides of the semiconductor layer 40 parallel to the first direction or the first gate pads 129. It is important that a plurality of second source pads 121 are not sandwiched between the second source pads 121 and the boundary 90C in the direction, but other second gate pads 129 are sandwiched. It may be arranged.
- each of the plurality of first source pads 111 and the plurality of second source pads 121 is not limited to a substantially rectangular shape, and may be a substantially circular group as shown in FIG. 7E. However, it is desirable that each group is arranged in a band shape in the first direction.
- the band-shaped arrangement means that the object is arranged within a certain width in a certain direction.
- each source pad is a group having a substantially circular shape as shown in FIG. 7E, each group is referred to as a first source pad 111a or the like.
- the shape of the source pad may be a group having a substantially circular shape.
- the first gate pad and the second gate pad are respectively defined by the center line that bisects the semiconductor layer in the first direction. It is preferably arranged so as to come into contact with the center line.
- the semiconductor device 1 having the above configuration is illustrated in FIG. 7B, for example.
- the first local region 191 is, for example, compared to the first local region 291 of the semiconductor device 1 shown in FIG. 8D.
- the symmetry between the case of considering the flow of the main current from the transistor 10 side to the transistor 20 side and the case of considering the flow of the main current from the transistor 20 side to the transistor 10 side is higher.
- the second local region 192 is closer to the transistor 20 than the second local region 292 of the semiconductor device 1 illustrated in FIG.
- the symmetry between the case where the main current flows to the side and the case where the main current flows from the transistor 20 side to the transistor 10 side is higher.
- the flow of the main current of the semiconductor device 1 when the semiconductor device 1 is locally captured is blocked by the first gate pad 119 and the second gate pad 129.
- the symmetry of the influence can be further enhanced.
- the rate at which the gate electrode erodes the active region can be further suppressed, it is expected that this effect will reduce conduction resistance and further suppress heat generation. Further, since the interval where nothing is originally provided can be used more effectively in the vicinity of the boundary 90C between the first region A1 and the second region A2, the plurality of first source pads 111 and the plurality of second source pads 111 are provided. The total area of the source pad 121 can be further increased. That is, the effect of reducing the on-resistance can be further enjoyed.
- the second side may be the same side as the first side.
- the semiconductor device 1 With such a configuration, in the semiconductor device 1, the first gate pad 119 that is a control function portion of the transistor 10 and the second gate pad 129 that is a control function portion of the transistor 20 are provided at one place. Can be aggregated. At this time, since the control system can be collectively arranged on one side even in the wiring pattern on the printed circuit board, the semiconductor device 1 having the above configuration can contribute to increasing the degree of freedom in circuit design.
- the inventor must enhance the effect of reducing the on-resistance of the semiconductor device 1 by arranging the first gate pad 119 and the second gate pad 129 so that the following two conditions are satisfied.
- the idea is that the control function part that becomes an obstacle to the main current path is (1) brought close to the end of the power line, and (2) dedicated to the part where the effective region is not originally provided.
- the first gate pad 119 and the second gate pad 129 which are the main current control function portions, are provided in the vicinity of the center line 90 (particularly right above the center line 90). This is because it becomes possible to arrange them.
- the main current path active region, shown in FIG.
- the area where the (inside the broken line) is not formed can be used somewhat as the area for arranging the gate pad, so that the ratio of erosion of the active area can be suppressed as compared with the case where the gate pad is arranged at other positions. ..
- the effect makes it possible to reduce the on-resistance. Further, the effect of suppressing heat generation by reducing the on-resistance can be expected.
- the position shown in FIG. 7A when the center of the first gate pad 119 and the center of the second gate pad 129 are both located on the center line 90, the position shown in FIG. More preferably, the first gate pad 119 and the second gate pad 129 are arranged at positions not contacting the center line 90.
- a surge for the transistor 10 is generated in the region 901 belonging to the first region A1.
- a third vertical MOS transistor for bypassing the current (hereinafter, also referred to as “transistor 60”) is arranged, and a fourth vertical transistor for bypassing the surge current to the transistor 20 is provided in a region 902 belonging to the second region A2. It is preferable to dispose a MOS transistor (hereinafter, also referred to as “transistor 70”).
- the semiconductor device 1 is further formed in the second region and a third vertical MOS transistor for bypassing a surge current with respect to the first vertical MOS transistor, which is formed in the first region.
- a fourth vertical MOS transistor for bypassing a surge current with respect to the second vertical MOS transistor, the third vertical MOS transistor and the fourth vertical MOS transistor in the plan view. It is preferable that each of the transistors is arranged between the first gate pad and the second gate pad.
- FIG. 11 is a circuit diagram showing an example of the semiconductor device 1 having the above configuration.
- FIG. 11 shows a first bidirectional Zener diode ZD1 and a second bidirectional Zener diode ZD2 which are not shown in FIG.
- FIG. 12 is a sectional view showing an example of the structure of the semiconductor device 1 having the above configuration.
- FIG. 12 shows a cross section taken along line AA of FIG.
- the transistor 60 for bypassing the surge current with respect to the transistor 10 formed in the first region A1 and the second region A2 are formed.
- a transistor 70 for bypassing a surge current with respect to the transistor 20 is formed.
- each of the transistor 60 and the transistor 70 is arranged so that at least a part thereof is sandwiched between the first gate pad 119 and the second gate pad 129, as shown in FIG. The reason will be described later.
- a third body region 1018 containing an impurity of the second conductivity type is formed in the region 901 belonging to the first region A1.
- a third source region 1014 containing an impurity of the first conductivity type, a third gate conductor 1015, and a third gate insulating film 1016 are formed in the third body region 1018.
- the third gate conductor 1015 is electrically connected to the portion 13 of the first source electrode 11.
- the fourth body region 2018 containing the impurity of the second conductivity type is formed in the region 902 belonging to the second region A2.
- a fourth source region 2014 containing an impurity of the first conductivity type, a fourth gate conductor 2015, and a fourth gate insulating film 2016 are formed in the fourth body region 2018.
- the fourth gate conductor 2015 is electrically connected to the portion 23 of the second source electrode 21.
- the low-concentration impurity layer 33 and the semiconductor substrate 32 serve as a first drain region of the transistor 10, a second drain region of the transistor 20, a third drain region of the transistor 60, and ,
- the fourth drain region of the transistor 70 is shared and functions as a common drain region.
- FIG. 13 is a top perspective view of the first bidirectional Zener diode ZD1 (second bidirectional Zener diode ZD2)
- FIG. 14 is a cross-sectional view taken along the plane B0-B1 shown in FIG.
- the first bidirectional Zener diode ZD1 includes a layer 171A, a layer 173A, and a layer 175A that are polysilicon layers of the first conductivity type and are arranged side by side in the horizontal direction. It is composed of a layer 172A and a layer 174A which are two conductivity type polysilicon layers.
- An interlayer insulating layer 34 is formed over the layers 171A to 175A, the layer 171A is the first source electrode 11 through the connection portion 176A, and the layer 175A is the first gate electrode through the connection portion 177A. 19 are connected to each other.
- the second bidirectional Zener diode ZD2 has the same structure as the first bidirectional Zener diode ZD1.
- the layer 171B is the second source electrode 21 via the connecting portion 176B, and the layer 175B is the connecting portion.
- the second gate electrode 29 is in contact with each other via 177B.
- the transistor 60 and the transistor 70 will be described below.
- the transistors 60 and 70 are designed so that the parasitic bipolar transistor, which is naturally provided in the structure of the device, can be easily turned on as compared with the transistors 10 and 20 that form the main current path.
- the occupation area ratio (in plan view) of the source region and the body region, which are alternately installed in the transistor 10 and the transistor 20 and the transistor 60 and the transistor 70 in a form orthogonal to the direction in which the gate conductor extends Change.
- the parasitic bipolar transistor can be more easily turned on as the proportion of the source region appearing is larger than that of the body region. If the parasitic bipolar transistor is easily turned on, the surge current easily flows through the parasitic bipolar transistor. Therefore, it is possible to manipulate the path of the surge current by providing a transistor that is easily turned on.
- the transistor 60 in which the parasitic bipolar transistor is easily turned on When the transistor 60 in which the parasitic bipolar transistor is easily turned on is installed in the region 901 belonging to the first region A1, when a surge current flows from the plurality of second source pads 121 of the transistor 20 to the first region A1, Before reaching the transistor 10, the surge current passes through the transistor 60 provided near the boundary 90C first. Further, since the transistor 60 has a structure in which the parasitic bipolar transistor is more easily turned on than the transistor 10, the surge current is discharged through the parasitic bipolar transistor of the transistor 60. Therefore, the transistor 10 forming the main current path is less likely to be destroyed due to conduction of the surge current, and the possibility that the main function of the semiconductor device 1 is lost can be reduced. 11 and 15 show typical paths through which surge current flows.
- the transistor 70 in which the parasitic bipolar transistor is easily turned on is installed in the region 902 belonging to the second region A2, a surge current flows from the plurality of first source pads 111 of the transistor 10 to the second region A2. In that case, the surge current passes through the transistor 70 provided near the boundary 90C before reaching the transistor 20. Further, since the transistor 70 has a structure in which the parasitic bipolar transistor is more easily turned on than the transistor 20, the surge current is discharged through the parasitic bipolar transistor of the transistor 70. Therefore, the transistor 20 forming the main current path is less likely to be destroyed due to conduction of the surge current, and the possibility of losing the main function of the semiconductor device 1 can be reduced.
- the semiconductor device 1 having the above-described configuration, it is possible to prevent the surge current from flowing to the transistor 10 and the transistor 20, so that it is possible to improve the ESD resistance.
- the semiconductor device 1 corresponds to the portion having the highest resistance when the entire circuit in the conductive state is captured. Further, the semiconductor device 1 in the conductive state also generates heat due to the magnitude of the ON resistance, and it is necessary to suppress the heat generation as much as possible and efficiently dissipate the heat.
- the total area of the plurality of first source pads 111 and the plurality of second source pads 121 is large. This is because if the area of contact of the solder is large, the main current path is expanded and the generated heat can be dissipated through the solder. Therefore, in the semiconductor device 1, in the plan view, at least a part of the plurality of first source pads and at least a part of the plurality of second source pads are the first gate pad and the first gate pad. It is useful to be arranged so as to be sandwiched between the two gate pads.
- the thin film of the semiconductor layer 40 which is the resistance component of the main current flowing in the vertical direction in FIG. 2B. It can be mentioned.
- thickening the metal layer 30, which is the common drain electrode is also useful for reducing the on-resistance. That is, in the semiconductor device 1, thinning the semiconductor layer 40 and thickening the metal layer 30 is effective in reducing the on-resistance.
- the semiconductor device 1 is generated at high temperature due to the difference in the physical properties such as the thermal expansion coefficient and the Young's modulus between the semiconductor and the metal. It is known that the warp increases.
- the warpage that occurs in the semiconductor device 1 mainly occurs in a high temperature environment when a heat treatment of about 250° C. is performed in solder reflow mounting.
- the metal layer 30 is mounted face down so as to face away from the printed circuit board.
- the metal layer 30 expands more than the semiconductor layer 40 at high temperature, the metal layer 30 faces away from the printed circuit board. Warpage occurs in a convex shape.
- solder sticking out As shown in FIG. 16, when the semiconductor device 1 is warped, it is not convenient for mounting the semiconductor device 1. In the vicinity of the center of the semiconductor device 1 which corresponds to the convex portion, there is a possibility that solder will be insufficient and joint failure (insufficient solder distribution) may occur, but in the outer peripheral region of the semiconductor device 1 where the warp increases the force pressed in the direction of the printed wiring board, There is a phenomenon in which the solder sticks out from the area where it should normally fit (solder sticking out).
- a plurality of first structures are required in order to reduce device resistance (thin film thickness of the semiconductor layer 40 and thick film thickness of the metal layer 30) to reduce ON resistance. This can be dealt with by optimizing the arrangement of the source pad 111 and the plurality of second source pads 121. As a result of earnest studies and experiments, the inventor has obtained some improvement results as follows.
- the semiconductor layer has a rectangular shape having a long side in the first direction, and each of the plurality of first source pads, and Each of the plurality of second source pads has a substantially rectangular shape whose longitudinal direction is parallel to the first direction, the plurality of first source pads are arranged in a stripe shape, and the plurality of second source pads are arranged.
- the source pads may be arranged in stripes.
- the warp of the semiconductor device 1 that appears at high temperature in reflow mounting is a warp that curves in a direction parallel to the long side of the semiconductor layer 40. ..
- the solder is squeezed into the mounting substrate side more strongly than the central portion of the semiconductor device 1, as schematically shown in FIG. Be done.
- each of the plurality of first source pads 111 and each of the plurality of second source pads 121 having the above-described shapes are arranged as described above, they are close to the two short sides of the semiconductor layer 40.
- the solder pressed in the region can flow toward the central portion (near the boundary 90C) of the semiconductor device 1 along the long side of the semiconductor layer 40.
- the semiconductor layer has a rectangular shape having a long side in a direction orthogonal to the first direction, and the plurality of first sources are provided.
- Each of the pads and each of the plurality of second source pads has a substantially rectangular shape whose longitudinal direction is orthogonal to the first direction, and the plurality of first source pads are arranged in a stripe shape.
- the plurality of second source pads may be arranged in a stripe shape.
- the warp of the semiconductor device 1 that appears at high temperature during reflow mounting is curved in a direction parallel to the long side of the semiconductor layer 40. It will be warped.
- the semiconductor device 1 By configuring the semiconductor device 1 as described above, when the semiconductor layer 40 has a rectangular shape having a long side in a direction orthogonal to the first direction, warpage of the semiconductor device 1 that appears at high temperature in reflow mounting is mounted. It is possible to reduce the effect on defects.
- the boundary 90C is in the direction orthogonal to the first direction, one of the plurality of first source pads 111 and one of the plurality of second source pads 121 are provided on one side of the semiconductor layer 40.
- the source pad may be long in the longitudinal direction from the vicinity of the short side to the vicinity of the other short side along the long side of the semiconductor layer 40 to a length substantially equal to the length of the long side.
- each of the first vertical MOS transistor and the second vertical MOS transistor is provided under the plurality of first source pads.
- a first source electrode connected to the plurality of first source pads, and a second source electrode connected to the plurality of second source pads below the plurality of second source pads.
- the side length of the semiconductor layer in the first direction is less than twice the side length in the direction orthogonal to the first direction, and the first source electrode and the second
- Each of the source electrodes has a substantially rectangular shape, and the longitudinal direction of each of the plurality of first source pads and each of the plurality of second source pads is the same as the long side direction of the first source electrode.
- the plurality of first source pads may be arranged in a stripe shape, and the plurality of second source pads may be arranged in a stripe shape.
- FIG. 18C shows the arrangement of the first source electrode 11 and the second source electrode 21 provided in the semiconductor device 1 when the semiconductor device 1 is viewed in plan.
- the first source electrode 11 and the second source electrode 21 occupy most areas of the first region A1 and the second region A2, respectively, and are arranged in a substantially rectangular shape.
- the first source electrode 11 is orthogonal to the first direction.
- the length of the side in the rotating direction is larger than the length of the side in the first direction.
- all of the plurality of first source pads 111 have a substantially rectangular shape, and the longitudinal direction thereof is set.
- the semiconductor layer 40 in the second source electrode 21, since the length of the side in the direction orthogonal to the first direction is larger than the length of the side in the first direction, all of the plurality of second source pads 121 are substantially rectangular.
- the semiconductor layers are respectively formed in the first direction in the first direction and the second source pads in the first direction. It may be arranged such that it is divided into two in the vicinity of a region that is divided in two in the orthogonal direction.
- the solder strongly pressed to the printed wiring board side in the region close to the two short sides of the semiconductor layer 40 has a region where the electrode pad is not formed near the center of the semiconductor device 1. It is possible that it will flow toward and eventually come out. Defects such as solder squeeze out may cause a loss of device function, such as short-circuiting between the plurality of first source pads 111 and the plurality of second source pads 121, where they should not be electrically connected. It should be prevented because it has properties.
- the solder strongly pressed to the printed wiring board side in the regions near the two short sides of the first source electrode 11 and the second source electrode 21 is It is conceivable that the source electrode 11 and the second source electrode 21 flow toward the region where the electrode pad is not formed in the vicinity of the centers in the long side direction, and eventually flow out. Defects such as solder squeeze out may cause a loss of device function, such as short-circuiting between the plurality of first source pads 111 and the plurality of second source pads 121, where they should not be electrically connected. It should be prevented because it has properties.
- the on-resistance may be adversely affected.
- the semiconductor layer has a substantially square shape, and each of the plurality of first source pads and the plurality of second sources is formed.
- Each of the pads may have a substantially rectangular shape whose longitudinal direction is a direction radially extending from the center of the semiconductor layer.
- the warp of the semiconductor device 1 that appears at high temperature during reflow mounting has a curved shape that is point-symmetric with respect to the center of the semiconductor device 1. Since neither the long side nor the short side exists in the semiconductor layer 40, it does not occur that the semiconductor layer 40 is biased in either direction. In such a case, in order to prevent mounting defects such as insufficient solder distribution and solder squeeze out, it is effective to arrange all the source pads so as to have a radial direction with the center of the semiconductor device 1 as a base point. ..
- an underfill is injected into a gap between the mounting substrate and the semiconductor device 1 when mounting face down to mount the mounting substrate. It is considered to perform processing so that water does not enter the gap between the semiconductor device 1 and the semiconductor device 1.
- the measure is to inject the underfill material into the gap between the mounting substrate and the semiconductor device 1 after first performing the mounting normally. There are many.
- the underfill material has a certain viscosity, if the gap is small, it is possible that the penetration of the underfill material does not proceed sufficiently to the required filling degree.
- the phenomenon of penetration is not limited to the height between the mounting substrate and the semiconductor device 1 (that is, the height of the solder, the amount of warpage of the semiconductor device 1, etc.), and the underfill material to be penetrated is two-dimensionally You must also verify that you can get around the entire required area while avoiding or wrapping around the barrier solder.
- the plurality of first source pads 111 and the plurality of second source pads 121 have a substantially rectangular shape having a longitudinal direction as shown in FIGS. 7A to 7D, 7F, 7G, 8A to 8D, and 9A. If the shape is elliptical, the underfill may not fully penetrate into the deep space, and may result in insufficient underfill penetration. To deal with such a problem, it is effective to finely separate the plurality of first source pads 111 and the plurality of second source pads 121 to increase the number of voids into which the underfill material easily penetrates.
- the plurality of first source pads have a substantially circular shape, and the first direction and the direction orthogonal to the direction are
- the plurality of second source pads which are arranged at equal intervals in a matrix having a row direction and a column direction, respectively, have a substantially circular shape, and the first direction and a direction orthogonal to the direction are respectively defined. It may be arranged at equal intervals in a matrix in the row direction and the column direction.
- voids are regularly provided between the plurality of first source pads 111 and between the plurality of second source pads 121, so that the underfill material penetrates. Will also be easier. However, since the on-resistance depends on the total area of the source pad, the on-resistance increases more than necessary if too many voids are provided.
- the plurality of first source pads have a substantially circular shape, and the first direction and the direction orthogonal to the direction are
- Each of the plurality of second source pads is arranged in a zigzag pattern having a row direction and a column direction at equal intervals, and the plurality of second source pads have a substantially circular shape, and the first direction and a direction orthogonal to the direction are respectively defined.
- the rows may be arranged in a staggered pattern in the row direction and the columns may be arranged at equal intervals.
- the state in which the plurality of source pads are arranged in a staggered manner at equal intervals means that the plurality of source pads are arranged in a matrix in equal intervals and an odd row (or an even row). ), the position of each source pad is shifted by 1/2 interval in the row direction.
- voids are regularly provided between the plurality of first source pads 111 and between the plurality of second source pads 121, so that the underfill material penetrates. Will also be easier. However, since the on-resistance depends on the total area of the source pad, the on-resistance increases more than necessary if too many voids are provided.
- the semiconductor device according to the present invention can be widely used as a chip size package type semiconductor device.
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Abstract
Description
[1.半導体装置の構造]
以下、実施の形態に係る半導体装置の構造について説明する。実施の形態に係る半導体装置は、半導体基板に2つの縦型MOS(Metal Oxide Semiconductor)トランジスタを形成した、フェイスダウン実装が可能なチップサイズパッケージ(Chip Size Package:CSP)型の半導体デバイスである。上記2つの縦型MOSトランジスタは、パワートランジスタであり、いわゆる、トレンチMOS型FET(Field Effect Transistor)である。
半導体装置1において、例えば、第1導電型をN型、第2導電型をP型として、第1のソース領域14、第2のソース領域24、半導体基板32、および、低濃度不純物層33はN型半導体であり、かつ、第1のボディ領域18および第2のボディ領域28はP型半導体であってもよい。
図3は、半導体装置1の、スマートホン、タブレット等のリチウムイオン電池パックで用いられる充放電回路への応用例を示す回路図である。この応用例において、半導体装置1は、制御IC2から、第1のゲート電極19および第2のゲート電極29に与えられる制御信号に応じて、電池3から負荷4への放電動作および負荷4から電池3への充電動作を制御する。このようにスマートホン、タブレット等のリチウムイオン電池パックで用いられる充放電回路として、半導体装置1が適用される場合、充電時間短縮や急速充電実現の制約から、半導体装置1のオン抵抗は、一例として、20V耐圧仕様として、2.2~2.4mΩ以下が求められる。
ところで半導体装置1は、実装基板であるプリント配線基板上にフェイスダウンで実装されて使用される。
2 制御IC
3 電池
4 負荷
10 トランジスタ(第1の縦型MOSトランジスタ)
11 第1のソース電極
12、13、22、23 部分
14 第1のソース領域
15 第1のゲート導体
16 第1のゲート絶縁膜
18 第1のボディ領域
20 トランジスタ(第2の縦型MOSトランジスタ)
21 第2のソース電極
24 第2のソース領域
25 第2のゲート導体
26 第2のゲート絶縁膜
28 第2のボディ領域
30 金属層
32 半導体基板
33 低濃度不純物層
34 層間絶縁層
35 パッシベーション層
40 半導体層
50 プリント配線基板(実装基板)
51、52、53、1051、1053、1151、1153 配線パターン
54 クリアランス
60 トランジスタ(第3の縦型MOSトランジスタ)
70 トランジスタ(第4の縦型MOSトランジスタ)
90 中央線
90C 境界
91 一方の長辺
92 他方の長辺
93 一方の短辺
94 他方の短辺
111、111a、111b、111c、111d、111e、111f、1111 第1のソースパッド
119、119A,119B 第1のゲートパッド
121、121a、121b、121c、121d、121e、121f、1121 第2のソースパッド
129、129A、129B 第2のゲートパッド
171A、171B、172A、172B、173A、173B、174A、174B、175A、175B 層
176A、176B、177A、177B 接続部
191、291 第1の局所領域
192、292 第2の局所領域
511、511a、511b、511c、511d、511e、511f 第1の実装ソースパッド
519 第1の実装ゲートパッド
521、521a、521b、521c、521d、521e、521f 第2の実装ソースパッド
529 第2の実装ゲートパッド
901、902 領域
1014 第3のソース領域
1015 第3のゲート導体
1016 第3のゲート絶縁膜
1018 第3のボディ領域
2014 第4のソース領域
2015 第4のゲート導体
2016 第4のゲート絶縁膜
2018 第4のボディ領域
A1、A1001 第1の領域
A2、A1002 第2の領域
ZD1 第1の双方向ツェナーダイオード
ZD2 第2の双方向ツェナーダイオード
Claims (13)
- フェイスダウン実装が可能なチップサイズパッケージ型の半導体装置であって、
半導体層と、前記半導体層の裏面に接触して形成された金属層と、前記半導体層内の第1の領域に形成された第1の縦型MOSトランジスタと、前記半導体層の平面視において、前記半導体層内で前記第1の領域に隣接した第2の領域に形成された第2の縦型MOSトランジスタと、を有し、
前記半導体層は、半導体基板を有し、
前記第1の縦型MOSトランジスタと前記第2の縦型MOSトランジスタとのそれぞれは、前記半導体層の表面に、前記フェイスダウン実装時に実装基板に接合される、複数の第1のソースパッドおよび第1のゲートパッドと、複数の第2のソースパッドおよび第2のゲートパッドとを有し、
前記半導体基板は、前記第1の縦型MOSトランジスタおよび前記第2の縦型MOSトランジスタの共通ドレイン領域として機能し、
前記平面視において、
前記半導体層は矩形形状であり、
前記第1の縦型MOSトランジスタと前記第2の縦型MOSトランジスタとが第1の方向に並び、前記第1の方向に主電流が流れ、
前記第1のゲートパッドは、前記半導体層の4つの辺のうち、前記第1の方向に平行かつ最近接する第1の辺との間に、および、前記第1の方向における前記第1の領域と前記第2の領域との境界との間に、前記複数の第1のソースパッドが一部でも挟まれないように配置され、
前記第2のゲートパッドは、前記半導体層の4つの辺のうち、前記第1の方向に平行かつ最近接する第2の辺との間に、および、前記第1の方向における前記境界との間に、前記複数の第2のソースパッドが一部でも挟まれないように配置された、
半導体装置。 - 前記第2の辺は前記第1の辺と対向する辺である、
請求項1に記載の半導体装置。 - 前記平面視において、前記半導体層を、前記第1の方向に二等分する中央線に対して、前記第1のゲートパッドおよび前記第2のゲートパッドは、それぞれ前記中央線に接触するように配置された、
請求項2に記載の半導体装置。 - 前記第2の辺は前記第1の辺と同一の辺である、
請求項1に記載の半導体装置。 - 前記平面視において、前記境界は、クランク状である、
請求項1に記載の半導体装置。 - さらに、前記第1の領域に形成された、前記第1の縦型MOSトランジスタに対するサージ電流迂回用の第3の縦型MOSトランジスタと、前記第2の領域に形成された、前記第2の縦型MOSトランジスタに対するサージ電流迂回用の第4の縦型MOSトランジスタと、を有し、
前記平面視において、前記第3の縦型MOSトランジスタと前記第4の縦型MOSトランジスタとのそれぞれは、前記第1のゲートパッドと前記第2のゲートパッドとの間に配置された、
請求項2に記載の半導体装置。 - 前記平面視において、前記複数の第1のソースパッドの少なくとも一部と、前記複数の第2のソースパッドの少なくとも一部とは、前記第1のゲートパッドと前記第2のゲートパッドとの間に挟まれるように配置された、
請求項3に記載の半導体装置。 - 前記平面視において、
前記半導体層は、前記第1の方向を長辺とする長方形状であり、
前記複数の第1のソースパッドのそれぞれ、および、前記複数の第2のソースパッドのそれぞれは、長手方向が前記第1の方向と平行な略長方形状であり、
前記複数の第1のソースパッドは、ストライプ状に配置され、
前記複数の第2のソースパッドは、ストライプ状に配置された、
請求項1に記載の半導体装置。 - さらに、前記第1の縦型MOSトランジスタと前記第2の縦型MOSトランジスタとのそれぞれは、前記複数の第1のソースパッドの下に前記複数の第1のソースパッドに接続された第1のソース電極と前記複数の第2のソースパッドの下に前記複数の第2のソースパッドに接続された第2のソース電極と、を有し、
前記平面視において、
前記半導体層の前記第1の方向の辺長は、前記第1の方向と直交する方向の辺長の2倍未満であり、
前記第1のソース電極および前記第2のソース電極は、それぞれ略長方形状であり、
前記複数の第1のソースパッドのそれぞれ、および、前記複数の第2のソースパッドのそれぞれは、長手方向が前記第1のソース電極の長辺方向と平行な略長方形状であり、
前記複数の第1のソースパッドは、ストライプ状に配置され、
前記複数の第2のソースパッドは、ストライプ状に配置された、
請求項1に記載の半導体装置。 - 前記複数の第1のソースパッドのそれぞれおよび前記複数の第2のソースパッドのそれぞれは、前記半導体層を前記第1の方向と直交する方向で二分する領域の近傍で2分割されて配置された、
請求項9に記載の半導体装置。 - 前記平面視において、
前記半導体層は、略正方形状であり、
前記複数の第1のソースパッドのそれぞれ、および、前記複数の第2のソースパッドのそれぞれは、長手方向が前記半導体層の中心から放射状に伸びる方向となる略長方形状である、
請求項1に記載の半導体装置。 - 前記平面視において、
前記複数の第1のソースパッドは、略円形状であり、前記第1の方向と当該方向に直交する方向とを、それぞれ行方向と列方向とする行列状に、等間隔に配置され、
前記複数の第2のソースパッドは、略円形状であり、前記第1の方向と当該方向に直交する方向とを、それぞれ行方向と列方向とする行列状に、等間隔に配置された、
請求項1に記載の半導体装置。 - 前記平面視において、
前記複数の第1のソースパッドは、略円形状であり、前記第1の方向と当該方向に直交する方向とを、それぞれ行方向と列方向とする千鳥状に、等間隔に配置され、
前記複数の第2のソースパッドは、略円形状であり、前記第1の方向と当該方向に直交する方向とを、それぞれ行方向と列方向とする千鳥状に、等間隔に配置された、
請求項1に記載の半導体装置。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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JP2020526654A JP6775872B1 (ja) | 2018-12-19 | 2019-12-11 | 半導体装置 |
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TWI761740B (zh) * | 2018-12-19 | 2022-04-21 | 日商新唐科技日本股份有限公司 | 半導體裝置 |
TWI776413B (zh) * | 2021-03-05 | 2022-09-01 | 全宇昕科技股份有限公司 | 複合型功率元件 |
KR102434890B1 (ko) * | 2021-09-17 | 2022-08-22 | 누보톤 테크놀로지 재팬 가부시키가이샤 | 반도체 장치 |
WO2023062906A1 (ja) * | 2021-10-15 | 2023-04-20 | ヌヴォトンテクノロジージャパン株式会社 | 半導体装置 |
JP7233629B1 (ja) * | 2021-10-15 | 2023-03-06 | ヌヴォトンテクノロジージャパン株式会社 | 半導体装置 |
CN118176592A (zh) * | 2021-11-05 | 2024-06-11 | 罗姆股份有限公司 | 半导体装置 |
CN117413361A (zh) * | 2022-07-22 | 2024-01-16 | 新唐科技日本株式会社 | 半导体装置 |
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- 2019-12-11 JP JP2020526654A patent/JP6775872B1/ja active Active
- 2019-12-11 KR KR1020217003544A patent/KR102306576B1/ko active IP Right Grant
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KR102306576B1 (ko) | 2021-09-29 |
JP7038778B2 (ja) | 2022-03-18 |
KR20210016094A (ko) | 2021-02-10 |
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US11171234B2 (en) | 2021-11-09 |
TWI747754B (zh) | 2021-11-21 |
KR102308044B1 (ko) | 2021-10-01 |
CN113314527B (zh) | 2022-05-03 |
CN111684608A (zh) | 2020-09-18 |
CN111684608B (zh) | 2021-05-04 |
JP6775872B1 (ja) | 2020-10-28 |
JP2021005732A (ja) | 2021-01-14 |
CN113314527A (zh) | 2021-08-27 |
JPWO2020129786A1 (ja) | 2021-02-15 |
TWI761740B (zh) | 2022-04-21 |
TW202123473A (zh) | 2021-06-16 |
TW202105744A (zh) | 2021-02-01 |
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