CN117555384B - Low dropout linear voltage regulator and electronic equipment - Google Patents
Low dropout linear voltage regulator and electronic equipment Download PDFInfo
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- CN117555384B CN117555384B CN202410048371.0A CN202410048371A CN117555384B CN 117555384 B CN117555384 B CN 117555384B CN 202410048371 A CN202410048371 A CN 202410048371A CN 117555384 B CN117555384 B CN 117555384B
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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
- G05F1/561—Voltage to current converters
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- 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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Abstract
The application relates to a low dropout linear voltage regulator and electronic equipment, include: and the first output end of the soft start circuit is connected with the inverting input end of the linear amplification circuit, the second output end of the soft start circuit is connected with the non-inverting input end of the linear amplification circuit, the first input end of the soft start circuit is connected with the input voltage signal, the second input end of the soft start circuit is connected with the feedback output end of the linear amplification circuit, the differential pressure of the first voltage of the first output end and the second voltage of the second output end is controlled to be a fixed value, and the first voltage and the second voltage are amplified according to the feedback voltage of the feedback output end of the linear amplification circuit until the feedback voltage reaches the reference voltage. The low-dropout linear voltage regulator can realize synchronous rising of voltages of two input ends of an error amplifier in a linear amplifying circuit, has a fixed voltage difference in the rising process, and ensures that the low-dropout linear voltage regulator can accurately control the starting speed.
Description
Technical Field
The present disclosure relates to electronic circuits, and particularly to a low dropout linear regulator and an electronic device.
Background
With the rapid development of related technical fields such as communication, artificial intelligence and the like and the increasing demands of people on electronic products, the rapid development of related integrated circuit chips is greatly driven. Particularly in the field of portable electronic devices such as mobile phones, digital cameras, palm computers and the like, along with the continuous development of power supply technology, power supplies gradually develop to miniaturization and digitalization, so that the use of power supply chips is more and more widespread. LDO (low dropout regulator) low dropout linear voltage regulator is widely applied to the fields of mobile electronic equipment and Internet due to the advantages of low noise, low cost, simple circuit structure and the like.
In the starting process of the LDO, the power tube can generate large surge current which is many times larger than the maximum load current output by the LDO under the stable condition due to the large size of the power tube, so that related components are easily damaged, and even the LDO chip is burnt. Therefore, in the power supply design and application fields, the soft start circuit adjusts the voltage or current in the power supply circuit through the negative feedback principle, and the soft start circuit is an important method and a necessary means for solving the problem of overshoot and surge of output in the power supply power-on stage.
Although the soft start circuit can prevent the overshoot of the inductor current or the output voltage, in the start stage of the switching power supply, the reference signal of one input end of the error amplifier is usually slowly raised in the prior art, so that the stable rise of the output voltage is realized to reduce the damage of the surge current, and the voltage difference between the voltages of the two input ends of the error amplifier cannot be kept to be stable rise, so that the start speed of the error amplifier cannot be accurately controlled in the start process.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a low dropout linear regulator and an electronic device that can provide a stable voltage difference between two input voltages of an error amplifier, so that the two input voltages of the error amplifier can be raised synchronously, and the starting speed can be estimated accurately during the starting process.
In a first aspect, the present application provides a low dropout linear regulator comprising:
a linear amplifying circuit;
and the first output end of the soft start circuit is connected with the inverting input end of the linear amplifying circuit, the second output end of the soft start circuit is connected with the non-inverting input end of the linear amplifying circuit, the first input end of the soft start circuit is connected with an input voltage signal, the second input end of the soft start circuit is connected with the feedback output end of the linear amplifying circuit, the soft start circuit is used for controlling the differential pressure of the first voltage of the first output end and the second voltage of the second output end to be a fixed value, and amplifying the first voltage and the second voltage according to the feedback voltage of the feedback output end of the linear amplifying circuit until the feedback voltage reaches a reference voltage.
In one embodiment, the soft start circuit includes:
the first soft-start sub-circuit is characterized in that a first input end is connected with the input voltage signal, and a first output end is connected with an inverting input end of the linear amplifying circuit and used for generating the first voltage;
and the second input end of the second soft-start sub-circuit is connected with the feedback output end of the linear amplifying circuit, and the second output end of the second soft-start sub-circuit is connected with the non-inverting input end of the linear amplifying circuit and is used for generating the second voltage.
In one embodiment, the first soft-promoter circuit comprises: a first current source I1, a resistor R1 and a triode Q3,
one end of the resistor R1 is connected with the first current source I1, the other end of the resistor R1 is connected with the emitter of the triode Q3, the base electrode of the triode Q3 is connected with the feedback output end of the linear amplifying circuit, and the collector electrode of the triode Q3 is connected with the public ground.
In one embodiment, the second soft-promoter circuit comprises a second current source I2 and a triode Q4,
the emitter of the triode Q4 is connected with the second current source I2, the base electrode of the triode Q4 is connected with the feedback output end of the linear amplifying circuit, and the collector of the triode Q4 is connected with the collector of the triode Q3.
In one embodiment, the first soft-promoter circuit further comprises: the transistor NMOS1 is provided with a transistor,
the gate of the transistor NMOS1 is connected with a digital control signal, the source of the transistor NMOS1 is connected with the base electrode of the triode Q3, and the drain of the transistor NMOS1 is connected with the base electrode of the triode Q4.
In one embodiment, the linear amplifying circuit comprises an error amplifier EA, a power tube MP, a divider resistor RF1 and a divider resistor RF2,
the grid electrode of the power tube MP is connected with the output end of the error amplifier, the source electrode of the power tube MP is connected with a voltage source, the drain electrode of the power tube MP is connected with one end of the voltage dividing resistor RF1, the other end of the voltage dividing resistor RF1 is connected with one end of the voltage dividing resistor RF2, and the other end of the voltage dividing resistor RF2 is connected with a public ground.
In one embodiment, the soft start circuit further includes a triode Q5, a base electrode of the triode Q5 is connected to the input voltage signal, an emitter electrode of the triode Q5 is connected to the inverting input terminal of the error amplifier EA, and a collector electrode of the triode Q5 is connected to the common ground.
In one embodiment, the soft start circuit further comprises a trigger start circuit for generating a trigger enable signal to start the soft start circuit.
In one embodiment, the trigger-start circuit comprises a transistor PMOS1, a triode Q2, a resistor R0, a capacitor C0 and a third current source I0,
the grid electrode of the transistor PMOS1 is connected with a digital control signal, the source electrode of the transistor PMOS1 is connected with the third current source I0, and the drain electrode of the transistor PMOS1 is connected with the collector electrode and the base electrode of the triode Q1 and the base electrode of the triode Q2; the collector electrode of the triode Q2 is connected with a voltage source; the emitter of the triode Q1 is connected with one end of the resistor R0, and the other end of the resistor R0 is connected with a common ground; the emitter of the triode Q2 is connected with one end of the capacitor C0, and the other end of the capacitor C0 is connected with the public ground.
In a second aspect, the present application also provides an electronic device. The apparatus comprises a low dropout linear regulator as described in the first aspect above.
According to the low-dropout linear voltage regulator and the electronic equipment, the first output end of the soft start circuit is connected with the front soft start circuit of the linear amplification circuit, the second output end of the soft start circuit is connected with the in-phase input end of the linear amplification circuit, the first input end of the soft start circuit is connected with an input voltage signal, the second input end of the soft start circuit is connected with the feedback output end of the linear amplification circuit, the voltage difference between the first voltage of the first output end and the second voltage of the second output end is controlled to be a fixed value, the first voltage and the second voltage are amplified according to the feedback voltage of the feedback output end of the linear amplification circuit until the feedback voltage reaches a reference voltage, synchronous rising of the voltages of the two input ends of the error amplifier in the linear amplification circuit can be achieved, and the fixed voltage difference is achieved in the rising process, so that the low-dropout linear voltage regulator can accurately control the starting speed.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a block diagram of a low dropout linear regulator in one embodiment;
FIG. 2 is a circuit diagram of a low dropout linear regulator in one embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. And it is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to the drawings without inventive effort.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element. 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" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
In one embodiment, as shown in fig. 1, a block diagram of a low dropout linear regulator is provided, comprising a linear amplifying circuit 10 and a soft start circuit 20.
The first output end out1 of the soft start circuit 20 is connected to the inverting input end of the linear amplifying circuit 10, the second output end out2 is connected to the non-inverting input end of the linear amplifying circuit 10, the first input end in1 is connected to the input voltage signal Vref, the second input end in2 is connected to the feedback output end of the linear amplifying circuit 10, and is used for controlling the voltage difference between the first voltage of the first output end and the second voltage of the second output end to be a fixed value, and amplifying the first voltage and the second voltage according to the feedback voltage signal Vfb of the feedback output end of the linear amplifying circuit 10 until the feedback voltage signal Vfb reaches the reference voltage.
In the low dropout linear regulator, the first output terminal out1 of the soft start circuit is connected to the inverting input terminal of the linear amplifying circuit 10 before the linear amplifying circuit, the second output terminal out2 of the soft start circuit is connected to the non-inverting input terminal of the linear amplifying circuit, the first input terminal in1 of the soft start circuit is connected to the input voltage signal, the second input terminal in2 of the soft start circuit is connected to the feedback output terminal of the linear amplifying circuit 10, the differential voltage between the first voltage of the first output terminal and the second voltage of the second output terminal is controlled to be a fixed value, the first voltage and the second voltage are amplified according to the feedback voltage of the feedback output terminal of the linear amplifying circuit 10 until the feedback voltage reaches the reference voltage, the problem that the surge current damages components in the low dropout linear regulator in the prior art is solved, and the synchronous rising of the voltages of the two input terminals of the error amplifier in the linear amplifying circuit and the rising process can be realized, so that the low dropout linear regulator can accurately control the starting speed.
Optionally, the low dropout linear regulator further comprises a digital control module for generating a digital control signal to control on and off of a transistor in the low dropout linear regulator.
As shown in fig. 2, a circuit diagram of a low dropout linear regulator is provided.
In one embodiment, as shown in FIG. 2, the soft start circuit 20 includes a first soft start sub-circuit and a second soft start sub-circuit.
The first input terminal in1 of the first soft-start sub-circuit is connected to the input voltage signal Vref, and the first output terminal out1 is connected to the inverting input terminal of the linear amplifying circuit 10 for generating the first voltage Vref.
Specifically, the first soft-promoter circuit includes a first current source I1, a resistor R1, and a transistor Q3. One end of the resistor R1 is connected with the first current source I1, the other end of the resistor R1 is connected with the emitter of the triode Q3, the base electrode of the triode Q3 is connected with the feedback output end of the linear amplifying circuit 10, and the collector electrode of the triode Q3 is connected with the public ground.
Further, the first soft-promoter circuit further comprises a transistor NMOS1. The gate of the transistor NMOS1 is connected with a digital control signal, the source of the transistor NMOS1 is connected with the base electrode of the triode Q3, and the drain of the transistor NMOS1 is connected with the base electrode of the triode Q4.
The second input terminal in2 of the second soft-start sub-circuit is connected to the feedback output terminal of the linear amplifying circuit 10, and the second output terminal out2 is connected to the non-inverting input terminal of the linear amplifying circuit 10, for generating the second voltage VFB.
Specifically, the second soft-promoter circuit includes a second current source I2 and a transistor Q4. The emitter of the triode Q4 is connected with the second current source I2, the base of the triode Q4 is connected with the feedback output end of the linear amplifying circuit 10, and the collector of the triode Q4 is connected with the collector of the triode Q3.
The first current source I1 and the second current source I2 provide currents of equal magnitude.
In this embodiment, a fixed voltage difference between the first voltage VREF and the second voltage VFB during the increasing process is achieved through the resistor R1 in the first soft-start sub-circuit and the current I1 provided by the first current source flowing through the resistor R1. The starting time of the low dropout linear voltage regulator can be precisely controlled by utilizing the fixed voltage difference.
In one embodiment, as shown in fig. 2, the linear amplifying circuit 10 includes an error amplifier EA, a power transistor MP, a voltage dividing resistor RF1, and a voltage dividing resistor RF2.
The grid electrode of the power tube MP is connected with the output end of the error amplifier EA, the source electrode of the power tube MP is connected with a voltage source VDD, the drain electrode of the power tube MP is connected with one end of the voltage dividing resistor RF1, the other end of the voltage dividing resistor RF1 is connected with one end of the voltage dividing resistor RF2, and the other end of the voltage dividing resistor RF2 is connected with a public ground.
Further, the linear amplifying circuit 10 further includes a resistor Rout and a capacitor Cout, where the resistor Rout is connected in parallel with the capacitor Cout and then between the drain of the power tube MP and the common ground, and is used as an output load for outputting the voltage signal Vout.
In one embodiment, the soft start circuit 20 further includes a transistor Q5, a base of the transistor Q5 is connected to the input voltage signal Vref, an emitter of the transistor Q5 is connected to the inverting input terminal of the error amplifier EA, and a collector of the transistor Q5 is connected to the common ground.
In the present embodiment, the linear amplification of the input to the output of the voltage signal of the low dropout linear regulator is realized by the error amplifier EA, the power transistor MP, and two voltage dividing resistors.
In one embodiment, the soft start circuit 20 further includes a trigger start circuit for generating a trigger enable signal to start the soft start circuit. While the soft start circuit 20 is slowly time-delay started.
The trigger starting circuit comprises a transistor PMOS1, a triode Q2, a resistor R0, a capacitor C0 and a third current source I0.
The grid electrode of the transistor PMOS1 is connected with a digital control signal, the source electrode of the transistor PMOS1 is connected with the third current source I0, and the drain electrode of the transistor PMOS1 is connected with the collector electrode and the base electrode of the triode Q1 and the base electrode of the triode Q2; the collector electrode of the triode Q2 is connected with a voltage source; the emitter of the triode Q1 is connected with one end of the resistor R0, and the other end of the resistor R0 is connected with a common ground; the emitter of the triode Q2 is connected with one end of the capacitor C0, and the other end of the capacitor C0 is connected with the public ground.
In this embodiment, when the low dropout regulator is connected to a voltage source, a capacitor C0 in the trigger start circuit is triggered to perform charging control, so as to generate a trigger enable signal to start the soft start circuit of the low dropout regulator.
In one embodiment, a soft start control method of a low dropout linear regulator is provided, which is applied to the low dropout linear regulator shown in fig. 2, and specifically includes the following steps:
the circuit of the low dropout linear regulator shown in fig. 2 is powered on, and the digital control signal S0 and the digital control signal S1 are both low level signals, so that the transistor PMOS1 is turned on, the transistor NMOS1 is turned off, and the third current source I0 provides current to the transistor Q1, and the transistor Q1 is turned on. Because triode Q1 and triode Q2 are current mirror structure, therefore triode Q2 switches on, charges capacitor C0, produces and triggers the enabling signal and makes triode Q3's base potential rise, and the circuit begins work. Wherein the value of the base potential rise of transistor Q3 is determined by resistor R0.
Then, the digital control signal S0 and the digital control signal S1 are both high level signals, so that the transistor PMOS1 is turned off and the transistor NMOS1 is turned on. At this time, the base potential of the transistor Q4 is equal to the base potential of the transistor Q3, and the potential of the inverting input terminal of the error amplifier is higher than the potential of the non-inverting input terminal by a fixed voltage value, that is, a fixed voltage difference exists between the first voltage VREF and the second voltage VFB, and the magnitude of the voltage difference is determined by the resistor R1 and the current I1 flowing through the resistor R1.
Because of the fixed voltage difference, the feedback voltage Vfb at the feedback output end of the linear amplifying circuit is always increased until the feedback voltage Vfb is increased to the set reference voltage, the digital control signal S0 is a high-level signal, the digital control signal S1 is a low-level signal, the triode Q4 and the triode Q5 are conducted at the moment, the first soft-start sub-circuit is closed, the loop steady state of the linear amplifying circuit is established, and the feedback voltage Vfb is equal to the input signal voltage Vref.
In this embodiment, the states of the transistor PMOS1 and the transistor NMOS1 are controlled to control the on and off of the first soft-start circuit, and the voltage difference between the inverting input terminal and the non-inverting input terminal of the linear amplifying circuit is controlled to be a fixed value by using the resistor R1 and the first current source I1, so that the problem of damage to components caused by surge current in the low-dropout linear regulator in the prior art is solved, and meanwhile, the starting time of the low-dropout linear regulator is accurately controlled.
Based on the same inventive concept, the embodiments of the present application further provide an electronic device for implementing the low dropout linear regulator according to the above-mentioned embodiments, where the implementation scheme of the solution provided by using the low dropout linear regulator is similar to the implementation scheme described in the above-mentioned embodiments.
In one embodiment, an electronic device is provided, which includes the low dropout linear regulator described in the above embodiments, and other electronic components such as integrated circuits, transistors, and transistors. Including an electronic computer, a robot controlled by an electronic computer, a numerical control or programmed control system, etc. Such as electronic watches, smart phones, telephones, televisions, video cameras, radio recorders, combination boxes, compact discs, computers, gaming machines, mobile communication products, and the like.
In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments without conflict. For the sake of brevity, all of the possible combinations of the features of the above embodiments are not described, however, the scope of the description should be considered as if there are no contradictions between the combinations of the features.
It should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus having the benefit of this disclosure, such alterations would not be construed as having the benefit of this disclosure.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (8)
1. A low dropout linear regulator, comprising:
a linear amplifying circuit;
the first output end of the soft start circuit is connected with the inverting input end of the linear amplifying circuit, the second output end of the soft start circuit is connected with the non-inverting input end of the linear amplifying circuit, the first input end of the soft start circuit is connected with an input voltage signal, the second input end of the soft start circuit is connected with the feedback output end of the linear amplifying circuit, the soft start circuit is used for controlling the voltage difference between the first voltage of the first output end and the second voltage of the second output end to be a fixed value, and amplifying the first voltage and the second voltage according to the feedback voltage of the feedback output end of the linear amplifying circuit until the feedback voltage reaches a reference voltage;
the soft start circuit comprises a trigger start circuit, the trigger start circuit comprises a transistor PMOS1, a triode Q2, a resistor R0, a capacitor C0 and a third current source I0, the grid electrode of the transistor PMOS1 is connected with a digital control signal, the source electrode of the transistor PMOS1 is connected with the third current source I0, and the drain electrode of the transistor PMOS1 is connected with the collector electrode and the base electrode of the triode Q1 and the base electrode of the triode Q2; the collector electrode of the triode Q2 is connected with a voltage source; the emitter of the triode Q1 is connected with one end of the resistor R0, and the other end of the resistor R0 is connected with a common ground; the emitter of the triode Q2 is connected with one end of the capacitor C0, the other end of the capacitor C0 is connected with the public ground, and the trigger starting circuit is used for generating a trigger enabling signal to start the soft starting circuit.
2. The low dropout linear regulator according to claim 1, wherein said soft start circuit comprises:
the first soft-start sub-circuit is characterized in that a first input end is connected with the input voltage signal, and a first output end is connected with an inverting input end of the linear amplifying circuit and used for generating the first voltage;
and the second input end of the second soft-start sub-circuit is connected with the feedback output end of the linear amplifying circuit, and the second output end of the second soft-start sub-circuit is connected with the non-inverting input end of the linear amplifying circuit and is used for generating the second voltage.
3. The low dropout linear regulator according to claim 2, wherein said first soft starter circuit comprises: a first current source I1, a resistor R1 and a triode Q3,
one end of the resistor R1 is connected with the first current source I1, the other end of the resistor R1 is connected with the emitter of the triode Q3, the base electrode of the triode Q3 is connected with the feedback output end of the linear amplifying circuit, and the collector electrode of the triode Q3 is connected with the public ground.
4. The low dropout linear regulator according to claim 3, wherein said second soft starter circuit comprises a second current source I2 and a transistor Q4,
the emitter of the triode Q4 is connected with the second current source I2, the base electrode of the triode Q4 is connected with the feedback output end of the linear amplifying circuit, and the collector of the triode Q4 is connected with the collector of the triode Q3.
5. The low dropout linear regulator according to claim 4, wherein said first soft start subcircuit further comprises: the transistor NMOS1 is provided with a transistor,
the gate of the transistor NMOS1 is connected with a digital control signal, the source of the transistor NMOS1 is connected with the base electrode of the triode Q3, and the drain of the transistor NMOS1 is connected with the base electrode of the triode Q4.
6. The low dropout linear regulator according to claim 1, wherein said linear amplifying circuit comprises an error amplifier EA, a power tube MP, a voltage dividing resistor RF1 and a voltage dividing resistor RF2,
the grid electrode of the power tube MP is connected with the output end of the error amplifier, the source electrode of the power tube MP is connected with a voltage source, the drain electrode of the power tube MP is connected with one end of the voltage dividing resistor RF1, the other end of the voltage dividing resistor RF1 is connected with one end of the voltage dividing resistor RF2, and the other end of the voltage dividing resistor RF2 is connected with a public ground.
7. The low dropout linear regulator according to claim 6, wherein said soft start circuit further comprises a transistor Q5, a base of said transistor Q5 being connected to said input voltage signal, an emitter of said transistor Q5 being connected to an inverting input of said error amplifier EA, and a collector of said transistor Q5 being connected to said common ground.
8. An electronic device comprising the low dropout linear regulator according to any one of claims 1 to 7.
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| CN202410048371.0A CN117555384B (en) | 2024-01-12 | 2024-01-12 | Low dropout linear voltage regulator and electronic equipment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704005A (en) * | 2017-09-29 | 2018-02-16 | 湖南国科微电子股份有限公司 | Negative voltage linear stable |
| CN209327893U (en) * | 2017-11-14 | 2019-08-30 | 半导体组件工业公司 | Low-dropout regulator with soft starting circuit |
| CN113359930A (en) * | 2021-07-23 | 2021-09-07 | 上海艾为电子技术股份有限公司 | Linear regulator, soft start method, and electronic device |
| CN115167596A (en) * | 2022-07-22 | 2022-10-11 | 湘潭大学 | Novel sectional compensation band gap reference circuit |
| CN115333367A (en) * | 2022-08-25 | 2022-11-11 | 骏盈半导体(上海)有限公司 | Voltage conversion circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8638575B2 (en) * | 2010-08-11 | 2014-01-28 | Fairchild Semiconductor Corporation | High voltage startup circuit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704005A (en) * | 2017-09-29 | 2018-02-16 | 湖南国科微电子股份有限公司 | Negative voltage linear stable |
| CN209327893U (en) * | 2017-11-14 | 2019-08-30 | 半导体组件工业公司 | Low-dropout regulator with soft starting circuit |
| CN113359930A (en) * | 2021-07-23 | 2021-09-07 | 上海艾为电子技术股份有限公司 | Linear regulator, soft start method, and electronic device |
| CN115167596A (en) * | 2022-07-22 | 2022-10-11 | 湘潭大学 | Novel sectional compensation band gap reference circuit |
| CN115333367A (en) * | 2022-08-25 | 2022-11-11 | 骏盈半导体(上海)有限公司 | Voltage conversion circuit |
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| CN117555384A (en) | 2024-02-13 |
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