CN115525087A - Quick response low dropout regulator - Google Patents

Quick response low dropout regulator Download PDF

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Publication number
CN115525087A
CN115525087A CN202210320088.XA CN202210320088A CN115525087A CN 115525087 A CN115525087 A CN 115525087A CN 202210320088 A CN202210320088 A CN 202210320088A CN 115525087 A CN115525087 A CN 115525087A
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coupled
mos tube
triode
transient
circuit
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CN115525087B (en
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杨全
黄允隆
朱赞嘉
谷申
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Nanjing Zhilingxin Technology Co ltd
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Nanjing Zhilingxin Technology Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

The invention relates to a quick response low dropout regulator, which comprises an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a Miller capacitor and a transient enhancing circuit, wherein the Miller capacitor is arranged between the inverting end and the output end of the operational amplifier; the transient enhancement circuit comprises a transient boost circuit and a transient pull-down circuit. The invention provides a corresponding transient enhancement mode aiming at different output states of the low dropout regulator, effectively stabilizes the voltage and realizes the purpose of quick response; meanwhile, the circuit integration level is high, the circuit structure is simple, and the power consumption is further reduced.

Description

Quick response low dropout regulator
Technical Field
The invention relates to the technical field of Low Dropout regulators (LDOs), in particular to a quick-response Low-Dropout Regulator.
Background
An LDO is a linear regulator that uses a transistor or Field Effect Transistor (FET) operating in its saturation region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. Because the LDO circuit adopts PMOS as the output adjusting tube, increases the one-level common source inverting amplification, has higher output impedance for the position of output pole can be along with load change, and circuit stability is not high, and the LDO is a closed loop system, and stability is not high can directly lead to output voltage oscillation and can not use.
The current LDO often has a complex circuit structure design or cannot be accurately adjusted in order to achieve the purpose of rapidly responding to a stable voltage, so that the output voltage still oscillates, or the integration level is low and the power consumption is large.
Disclosure of Invention
In order to solve the above problems, the present invention provides a fast response low dropout regulator, which provides a circuit structure for solving the oscillation condition of an output voltage by sampling the voltage at an output side, for example, when the output voltage is too high, the output voltage is pulled down, and when the output voltage is too low, the output voltage is boosted, and meanwhile, the circuit structure design is simple, the integration level is high, and the power consumption is small.
The invention relates to a quick-response low-dropout linear regulator, which comprises an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a Miller capacitor and a transient enhancement circuit, wherein the Miller capacitor is arranged between the input end of the buffer and the output end of the regulator, the buffer is arranged between the output end of the operational amplifier and the grid electrode of the adjusting tube, a middle node of the feedback resistor group is coupled with the in-phase end of the operational amplifier, and the transient enhancement circuit is arranged between the grid electrode of the adjusting tube and the output end of the regulator; the transient enhancement circuit comprises a transient boost circuit and a transient pull-down circuit.
Further, the transient enhancement circuit further comprises a non-action circuit.
Further, the transient boost circuit comprises: one end of the first current source is coupled with the power supply, the other end of the first current source is coupled with the first MOS tube and the second MOS tube, the first MOS tube and the third MOS tube are coupled and then grounded, and the second MOS tube and the fourth MOS tube are coupled and then grounded; the grid electrode of the first MOS tube is connected with a sampling voltage; the grid electrode of the third MOS tube and the grid electrode of the fourth MOS tube are coupled and are coupled with the source electrode of the first MOS tube; one end of the second current source is coupled with the power supply, the second triode and the fifth triode, and the other end of the second current source is coupled with the first triode; the first triode is coupled with the third triode and then grounded, and the second triode is coupled with the fourth triode and then grounded; the base electrode of the second triode is coupled with the base electrode of the fifth triode and is connected with the emitting electrode of the fifth triode; and an emitter of the fifth triode outputs a transient boost signal through a resistor, and the transient boost signal is provided for the adjusting tube.
Further, the transient pull-down circuit comprises: one end of the third current source is coupled with the power supply, the other end of the third current source is coupled with the fifth MOS tube and the sixth MOS tube, the fifth MOS tube and the seventh MOS tube are coupled and then grounded, and the sixth MOS tube and the eighth MOS tube are coupled and then grounded; the grid electrode of the fifth MOS tube is connected with the sampling voltage; the grid electrode of the seventh MOS tube is coupled with the grid electrode of the eighth MOS tube and is coupled with the source electrode of the fifth MOS tube; one end of the fourth current source is coupled with the power supply, the other end of the fourth current source is connected with the first resistor and the second resistor, the first resistor is coupled with the fifth triode and then grounded, and the second resistor is coupled with the sixth triode and then grounded; the base electrode of the fifth triode is coupled with the grid electrode of the sixth MOS tube and is coupled with the source electrode of the sixth MOS tube; the base electrode of the sixth triode is connected with a reference voltage, and a transient pull-down signal is output by the common end of the second resistor and the collector electrode of the sixth triode and is provided for the adjusting tube.
Furthermore, the low dropout regulator further comprises a load capacitor and a load resistor, wherein the load capacitor and the load resistor are connected in parallel at two ends of the feedback resistor group and are grounded.
Further, the non-action circuit is a normally open switch circuit.
Furthermore, when the output voltage of the low dropout regulator is too high, the transient pull-down circuit reduces the gate-source voltage of the regulating tube and reduces the output overshoot.
Furthermore, when the output voltage of the low dropout regulator is too low, the transient boost circuit enables the gate-source voltage of the regulating tube to be increased, and the output voltage drop is reduced.
Furthermore, the transient enhancement circuit is connected with a reference voltage and an input voltage, and the reference voltage and the input voltage at the inverting terminal of the operational amplifier are the same reference voltage.
Further, the transient enhancement circuit does not include a deactivation circuit
The invention has the following technical effects:
1. the transient boost circuit and the transient pull-down circuit respectively reduce or increase the gate-source voltage of the adjusting tube aiming at the conditions of the reduction and the overshoot of the output voltage of the voltage stabilizer, thereby quickly reducing the influence caused by output oscillation.
2. The Miller capacitor is not directly coupled with the grid electrode of the adjusting tube, but is isolated by the buffer, so that the stability of the circuit output is further improved.
Drawings
FIG. 1 is a circuit diagram of a fast response low dropout linear regulator of the present invention;
FIG. 2 is a schematic diagram of a transient boost circuit of the fast response low dropout linear regulator of the present invention;
FIG. 3 is a schematic diagram of a transient pull-down circuit of the fast response low dropout linear regulator of the present invention.
Detailed Description
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element such as a layer, region or substrate is referred to as being "on" or "extending" over "another element, it can be directly on or extend directly over the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or extending "directly onto" another element, there are no intervening elements present. It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
Relative terms, such as "below" or "above", "above" or "below" or "horizontal" or "vertical", may be used herein to describe the plumbing of one element, layer or region to another. As shown in the figures, it will be understood that these terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention is described below with reference to flowchart illustrations and/or block diagrams of methods, systems and computer program products according to embodiments of the invention. It will be understood that some blocks of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be stored or embodied in a microcontroller, microprocessor, digital Signal Processor (DSP), field Programmable Gate Array (FPGA), state machine, programmable Logic Controller (PLC) or other processing circuitry, general purpose computer, or special purpose computer. Use of a computer or other programmable data processing apparatus (e.g., a production machine) to create a means or block diagram for implementing the function/act specified in the flowchart and/or block diagram block or blocks by means of instructions executed by the processor of the computer or other programmable data processing apparatus.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means. The functions/acts specified in the flowchart and/or block diagram are implemented.
The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus are possible. Other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. It should be understood that the functions/acts noted in the blocks may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Although some of the figures include arrows on communication paths to show the primary direction of communication, it is to be understood that communication may occur in the opposite direction to the depicted arrows.
The specific implementation process of the invention is as follows:
as shown in fig. 1, the present invention relates to a fast response low dropout regulator, which includes an operational amplifier, a buffer, an adjusting tube, a feedback resistor set, a miller capacitor, and a transient boost circuit, wherein the miller capacitor is disposed between an input terminal of the buffer and an output terminal of the regulator, the buffer is disposed between an output terminal of the operational amplifier and a gate of the adjusting tube, a middle node of the feedback resistor set is coupled to a non-inverting terminal of the operational amplifier, and the transient boost circuit is disposed between the gate of the adjusting tube and the output terminal of the regulator; the transient enhancement circuit comprises a transient boost circuit and a transient pull-down circuit.
Preferably, the transient enhancement circuit further comprises a deactivation circuit.
Preferably, as shown in fig. 2, the transient boost circuit includes: a first current source I1, the first current source I 1 One end of (1) and a power supply V CC The other end of the first MOS tube M1 is coupled with the second MOS tube M2, the first MOS tube M1 is coupled with the third MOS tube M2 and then grounded, and the second MOS tube M2 is coupled with the fourth MOS tube M4 and then grounded; the grid electrode of the first MOS tube M1 is connected with a sampling voltage S; the grid electrode of the third MOS transistor M3 and the grid electrode of the fourth MOS transistor M4 are coupled and are coupled with the source electrode(s) of the first MOS transistor M1; a second current source I 2 Said second current source I 2 One end connected to a power supply V CC The second triode J2 and the fifth triode J5 are coupled, and the other end of the second triode J2 is coupled with the first triode J1; the first triode J1 is coupled with the third triode J3 and then grounded, and the second triode J2 is coupled with the fourth triode J4 and then grounded; a base of the second triode J2 and the fifth triodeThe base electrode (b) of the tube J5 is coupled and connected with the emitter electrode (e) of the fifth triode J5; the emitter (e) of the fifth triode J5 passes through a resistor R P1 And outputting a transient boost signal, wherein the transient boost signal is provided for the regulating pipe MP.
Preferably, as shown in fig. 3, the transient pull-down circuit includes: a third current source I 3 Said third current source I 3 One end connected to a power supply V CC The other end of the first MOS transistor is coupled with a fifth MOS transistor M5 and a sixth MOS transistor M6, the fifth MOS transistor M5 and a seventh MOS transistor M7 are coupled and then grounded, and the sixth MOS transistor M6 and an eighth MOS transistor M8 are coupled and then grounded; the grid (g) of the fifth MOS tube M5 is connected with the sampling voltage S; the gate (g) of the seventh MOS transistor M7 and the gate (g) of the eighth MOS transistor M8 are coupled and are coupled to the source(s) of the fifth MOS transistor M5; a fourth current source I 4 Said fourth current source I 4 Is connected to a power supply V CC Coupled to the other end of the first resistor R 1 And a second resistor R 2 Connected to said first resistor R 1 A fifth triode J5, a second resistor R and a third resistor R 2 The sixth triode J6 is coupled and then grounded; a base (b) of the fifth triode J5 is coupled with a gate (g) of the sixth MOS transistor M6 and is coupled with a source(s) of the sixth MOS transistor J6; the base electrode (b) of the sixth triode J6 is connected with a reference voltage V B Said second resistance R 2 And the common end of the collector (c) of the sixth triode J6 outputs a transient pull-down signal, and the transient pull-down signal is provided for the adjusting tube MP.
Preferably, the low dropout regulator further comprises a load capacitor C L And a load resistance R L Said load capacitance C L And a load resistance R L Connected in parallel to a feedback resistor group (R) f1 And R f2 ) Both ends are grounded.
Preferably, the immobilizer circuit is a normally open switch circuit.
Preferably, when the output voltage of the low dropout regulator is too high, the transient pull-down circuit reduces the gate-source voltage of the regulating tube, and reduces the output overshoot.
Preferably, when the output voltage of the low dropout regulator is too low, the transient boost circuit increases the gate-source voltage of the regulating tube, so as to reduce the output voltage drop.
Preferably, the transient enhancement circuit is connected to a reference voltage and an input voltage, and the reference voltage and the input voltage at the inverting terminal of the operational amplifier are the same reference voltage.
Preferably, the transient enhancement circuit does not include a deactivation circuit.
In summary, the low dropout regulator with fast response is provided with the transient boost circuit, when the output voltage of the low dropout regulator is too high, the transient pull-down circuit reduces the gate-source voltage of the regulating tube, and reduces the output overshoot; when the output voltage of the low dropout linear regulator is too low, the transient boost circuit enables the grid source voltage of the adjusting tube to be increased, and the output voltage drop is reduced, so that the oscillation output by the low dropout linear regulator is quickly responded, and the Miller capacitor is isolated by the buffer and then connected with the grid electrode of the adjusting tube, so that the stability of circuit output is further improved.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art who read the present application can make various modifications or alterations of the present invention by referring to the above-mentioned embodiments within the scope of the claims of the present application.

Claims (10)

1. A quick response low dropout regulator is characterized by comprising an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a Miller capacitor and a transient enhancement circuit, wherein the Miller capacitor is arranged between the input end of the buffer and the output end of the regulator, the buffer is arranged between the output end of the operational amplifier and the grid electrode of the adjusting tube, the middle node of the feedback resistor group is coupled with the in-phase end of the operational amplifier, and the transient enhancement circuit is arranged between the grid electrode of the adjusting tube and the output end of the regulator; the transient enhancement circuit comprises a transient boost circuit and a transient pull-down circuit.
2. The fast response low dropout linear regulator of claim 1 wherein said transient enhancement circuit further comprises a deactivation circuit.
3. The fast response low dropout linear regulator of claim 1 wherein said transient boost circuit comprises: one end of the first current source is coupled with a power supply, the other end of the first current source is coupled with the first MOS tube and the second MOS tube, the first MOS tube and the third MOS tube are coupled and then grounded, and the second MOS tube and the fourth MOS tube are coupled and then grounded; the grid electrode of the first MOS tube is connected with a sampling voltage; the grid electrode of the third MOS tube and the grid electrode of the fourth MOS tube are coupled and are coupled with the source electrode of the first MOS tube; one end of the second current source is coupled with the power supply, the second triode and the fifth triode, and the other end of the second current source is coupled with the first triode; the first triode is coupled with the third triode and then grounded, and the second triode is coupled with the fourth triode and then grounded; the base electrode of the second triode is coupled with the base electrode of the fifth triode and is connected with the emitting electrode of the fifth triode; and an emitter of the fifth triode outputs a transient boost signal through a resistor, and the transient boost signal is provided for the adjusting tube.
4. The fast response low dropout linear regulator of claim 1 wherein said transient pull-down circuit comprises: one end of the third current source is coupled with the power supply, the other end of the third current source is coupled with the fifth MOS tube and the sixth MOS tube, the fifth MOS tube and the seventh MOS tube are coupled and then grounded, and the sixth MOS tube and the eighth MOS tube are coupled and then grounded; the grid electrode of the fifth MOS tube is connected with the sampling voltage; the grid electrode of the seventh MOS tube is coupled with the grid electrode of the eighth MOS tube and is coupled with the source electrode of the fifth MOS tube; one end of the fourth current source is coupled with the power supply, the other end of the fourth current source is connected with the first resistor and the second resistor, the first resistor is coupled with the fifth triode and then grounded, and the second resistor is coupled with the sixth triode and then grounded; the base electrode of the fifth triode is coupled with the grid electrode of the sixth MOS tube and is coupled with the source electrode of the sixth MOS tube; the base electrode of the sixth triode is connected with a reference voltage, and the common end of the second resistor and the collector electrode of the sixth triode outputs a transient pull-down signal which is provided for the adjusting tube.
5. The fast response low dropout regulator according to any one of claims 1-4, further comprising a load capacitor and a load resistor connected in parallel across the feedback resistor bank and connected to ground.
6. The fast response low dropout regulator of claim 2 wherein the inactive circuit is a normally-on switching circuit.
7. The fast response low dropout regulator according to claim 4, wherein when the output voltage of the low dropout regulator is too high, the transient pull-down circuit decreases the gate-source voltage of the regulating transistor to reduce the output overshoot.
8. The fast response low dropout regulator according to claim 3, wherein when the output voltage of the low dropout regulator is too low, the transient boost circuit increases the gate-source voltage of the regulating transistor to reduce the output voltage drop.
9. The fast response low dropout regulator of any one of claims 1-4 wherein said transient enhancement circuit is connected to a reference voltage and an input voltage, said reference voltage being the same reference voltage as the input voltage at the inverting terminal of said operational amplifier.
10. The fast response low dropout linear regulator of claim 1 wherein the transient enhancement circuit does not include a deactivation circuit.
CN202210320088.XA 2022-03-29 2022-03-29 Quick response low dropout linear voltage regulator Active CN115525087B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103744462A (en) * 2013-10-22 2014-04-23 中山大学 Low-power-consumption transient-response enhanced low-dropout linear regulator and regulating method thereof
CN105116955A (en) * 2015-10-09 2015-12-02 东南大学 Transient enhancement circuit applied to full-integration LDO
CN111857230A (en) * 2020-08-11 2020-10-30 上海艾为电子技术股份有限公司 Linear regulator and electronic device
WO2022041011A1 (en) * 2020-08-26 2022-03-03 华为技术有限公司 Transient boost circuit for ldo, chip system and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103744462A (en) * 2013-10-22 2014-04-23 中山大学 Low-power-consumption transient-response enhanced low-dropout linear regulator and regulating method thereof
CN105116955A (en) * 2015-10-09 2015-12-02 东南大学 Transient enhancement circuit applied to full-integration LDO
CN111857230A (en) * 2020-08-11 2020-10-30 上海艾为电子技术股份有限公司 Linear regulator and electronic device
WO2022041011A1 (en) * 2020-08-26 2022-03-03 华为技术有限公司 Transient boost circuit for ldo, chip system and device

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