Linear voltage regulator circuits and electronic devices incorporating them

Abstract

This application provides a linear voltage regulator circuit and an electronic device having the same. The linear voltage regulator circuit includes an input power supply, a first current mirror module, a drive path, a regulated output path, and a current limiting module. The input power supply provides an input voltage. The first current mirror module has a power input terminal, a drive output terminal, and a voltage output terminal. The power input terminal is coupled to the input power supply to receive the input voltage. The drive path has a drive input terminal and a ground terminal. The current limiting module is coupled to the drive path. By raising the voltage of the drive output terminal when the input voltage is lower than or equal to a set value of the regulated voltage, the voltage difference between the power input terminal and the drive output terminal of the first current mirror module is reduced, so that the transistor coupled to the drive path in the first current mirror module operates in the linear region, thereby reducing the current in the drive path and helping to reduce the static power consumption of the linear voltage regulator circuit.

Description

Technical Field

[0001] The disclosed embodiments of this application relate to the field of voltage management technology, and more specifically, to a linear voltage regulator circuit and an electronic device having the same. Background Technology

[0002] A linear voltage regulator circuit keeps the output voltage stable near the reference voltage by making the output voltage follow the reference voltage.

[0003] A linear voltage regulator circuit includes a driver stage and an output stage. The output stage is used to generate the output voltage. The driver stage current and the output stage current are mirror images of each other under normal operating conditions, and the driver stage current is less than the output stage current. However, when the input voltage of the output stage is less than the set voltage of the output voltage, the driver stage current will increase, resulting in increased static power consumption.

[0004] Therefore, how to reduce the static power consumption of linear voltage regulator circuits has become an urgent problem to be solved. Utility Model Content

[0005] According to embodiments of this application, this application proposes a linear voltage regulator circuit and an electronic device having the same, to reduce the static power consumption of the linear voltage regulator circuit.

[0006] According to one aspect of this application, a linear voltage regulator circuit is disclosed, including an input power supply, a first current mirror module, a drive path, a regulated output path, and a current limiting module. The input power supply is used to provide an input voltage. The first current mirror module has a power input terminal, a drive output terminal, and a voltage output terminal. The power input terminal is coupled to the input power supply to receive the input voltage. The drive path has a drive input terminal and a ground terminal. The drive input terminal is coupled to the drive output terminal, and the ground terminal is grounded. The regulated output path has a regulated input terminal and a regulated output terminal. The regulated input terminal is coupled to the voltage output terminal, and the regulated output terminal is used to connect to a load to provide a stable voltage to the load. The current limiting module is coupled to the drive path. The current limiting module is configured to raise the voltage of the drive output terminal when the input voltage is lower than or equal to a set value of the stable voltage, and to lower the voltage of the drive output terminal when the input voltage is higher than the set value of the stable voltage.

[0007] According to a second aspect of this application, an electronic device is disclosed, including the linear voltage regulator circuit described in the first aspect above.

[0008] In the above scheme, the linear voltage regulator circuit includes an input power supply, a first current mirror module, a drive path, a regulated output path, and a current limiting module. The input power supply provides the input voltage. The first current mirror module has a power input terminal, a drive output terminal, and a voltage output terminal. The power input terminal is coupled to the input power supply to receive the input voltage. The drive path has a drive input terminal and a ground terminal. The drive input terminal is coupled to the drive output terminal, and the ground terminal is grounded. The regulated output path has a regulated input terminal and a regulated output terminal. The regulated input terminal is coupled to the voltage output terminal, and the regulated output terminal is used to connect to the load to provide a stable voltage to the load. The current limiting module is coupled to the drive path. The current limiting module is configured to raise the voltage of the drive output terminal when the input voltage is lower than or equal to a set value of the stable voltage, and to lower the voltage of the drive output terminal when the input voltage is higher than the set value of the stable voltage. By increasing the voltage at the drive output terminal when the input voltage is lower than or equal to the set value of the stable voltage through the current limiting module, the voltage difference between the power input terminal and the drive output terminal of the first mirror current module is reduced, so that the transistor coupled to the drive path in the first mirror current module operates in the linear region, thereby reducing the current in the drive path, which is beneficial to reducing the static power consumption of the linear voltage regulator circuit. Attached Figure Description

[0009] The present application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

[0010] Figure 1 This is a schematic diagram of the framework of a linear voltage regulator circuit in one embodiment of this application;

[0011] Figure 2 This is a schematic diagram of the circuit structure of a traditional linear voltage regulator;

[0012] Figure 3 This is a partial schematic diagram of the linear voltage regulator circuit in another embodiment of this application;

[0013] Figure 4 This is a partial schematic diagram of the linear voltage regulator circuit in another embodiment of this application;

[0014] Figure 5 This is a schematic diagram of the linear voltage regulator circuit in yet another embodiment of this application;

[0015] Figure 6 This is a schematic diagram of the linear voltage regulator circuit in yet another embodiment of this application;

[0016] Figure 7 This is a schematic diagram of the linear voltage regulator circuit in yet another embodiment of this application;

[0017] Figure 8 This is a schematic diagram of the framework of an embodiment of an electronic device according to this application;

[0018] Figure 9 This is a schematic diagram showing the relationship between the static current and the input voltage of a linear voltage regulator circuit according to an embodiment of this application. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless otherwise clearly indicated above. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0021] It should be understood that the term "and / or" used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] It should be understood that the terms "comprising," "including," or any other variations used herein are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in every place in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Please refer to Figure 1 An embodiment of this application provides a linear voltage regulator circuit 100 including an input power supply 110, a first current mirror module 120, a drive path 1L, a regulated output path 2L, and a current limiting module 130. The input power supply 110 provides an input voltage. The first current mirror module 120 has a power input terminal 120a, a drive output terminal 120b, and a voltage output terminal 120c. The power input terminal 120a is coupled to the input power supply 110 to receive the input voltage. The drive path 1L has a drive input terminal 1La and a ground terminal 1Lb. The drive input terminal 1La is coupled to the drive output terminal 120a. b. Grounding terminal 1Lb is grounded; the regulated output path 2L has a regulated input terminal 2La and a regulated output terminal 2Lb; the regulated input terminal 2La is coupled to the voltage output terminal 120c, and the regulated output terminal 2Lb is used to connect to the load to provide a stable voltage to the load; the current limiting module 130 is coupled to the drive path 1L; wherein the current limiting module 130 is configured to raise the voltage of the drive output terminal 120b when the input voltage is lower than or equal to the set value of the stable voltage, and to lower the voltage of the drive output terminal 120b when the input voltage is higher than the set value of the stable voltage.

[0025] Please refer to Figure 2 In a conventional linear regulator, there is typically a differential amplifier stage 210, a driver stage 220, and an output stage 230. The output stage 230 generates a stable output voltage to power the load. Both the driver stage 220 and the output stage 230 contain transistors M22 and M21 (e.g., metal-oxide-semiconductor field-effect transistors), which form a current mirror circuit. The driver stage 220 includes a driver circuit 221 coupled to the drain of transistor M22. The driver circuit 221 is driven by an error amplifier EA, which compares the feedback voltage with a reference voltage VREF and drives the driver circuit 221 to generate a stable output voltage VOUT in the output stage 230. The feedback voltage is derived from the output voltage VOUT.

[0026] exist Figure 2In the circuit shown, the gates of transistors M21 and M22 are interconnected, and the sources of both transistors are connected to the input voltage VIN. When the input voltage VIN is relatively high, the source-drain voltage difference between the two transistors is high, and both transistors M21 and M22 operate in the saturation region. The currents are mirror images of each other according to their size ratio, that is, the drain current I21 of transistor M21 is N times the drain current I22 of transistor M22 (I22=I21 / N). When VIN≤VOSET (VOSET is the set value of the output voltage VOUT, that is, the voltage value that the output voltage VOUT should reach when the linear regulator is working normally), the VOUT received at the input of the error amplifier EA is lower than the reference voltage VREF. The drive circuit 221 can pull down the gate voltages of transistors M21 and M22 to the maximum extent to maximize the output capability, that is, increase the output voltage VOUT. At this time, the gate-source voltage difference of transistors M21 and M22 is very large. Transistor M21 enters the linear region, while transistor M22 remains in the saturation region. The current in transistor M21 follows the linear region current formula:

[0027] ,in, The constant represents the electron mobility of the PMOS transistor. Here, VGS represents the width-to-length ratio of transistor M21, VTH represents the gate-source voltage drop, VDS21 represents the threshold voltage, and VDS21 represents the drain-source voltage drop of transistor M21. The current in transistor M22 follows the saturation formula. >> ,in, The aspect ratio of transistor M22 is such that when transistor M22 is operating in the saturation region, its drain current I22 is much greater than 1 / N times the drain current I21 of transistor M21, resulting in a surge in static power consumption, which is not conducive to the design of low-power linear regulators.

[0028] Please refer to the linear voltage regulator circuit 100 provided in this application. Figure 1The linear voltage regulator circuit 100 includes an input power supply 110, a first current mirror module 120, a drive path 1L, a regulated output path 2L, and a current limiting module 130. The input power supply 110 provides the input voltage. The first current mirror module 120 has a power input terminal 120a, a drive output terminal 120b, and a voltage output terminal 120c. The power input terminal 120a is coupled to the input power supply 110 to receive the input voltage. The drive path 1L has a drive input terminal 1La and a ground terminal 1Lb. The drive input terminal 1La is coupled to the drive output terminal 120b, and the ground terminal 1Lb is connected to the drive path 2L. 1Lb is grounded; the regulated output path 2L has a regulated input terminal 2La and a regulated output terminal 2Lb; the regulated input terminal 2La is coupled to the voltage output terminal 120c, and the regulated output terminal 2Lb is used to connect to the load to provide a stable voltage to the load; a current limiting module 130 is coupled to the drive path 1L; wherein, the current limiting module 130 is configured to increase the voltage of the drive output terminal 120b when the input voltage is lower than or equal to the set value of the stable voltage, and to decrease the voltage of the drive output terminal 120b when the input voltage is higher than the set value of the stable voltage. By increasing the voltage of the drive output terminal 120b when the input voltage is lower than or equal to the set value of the stable voltage, the voltage difference between the power input terminal 120a and the drive output terminal 120b of the first mirror current module 120 is reduced, so that the transistor in the first mirror current module 120 coupled to the drive path 1L operates in the linear region, thereby reducing the current in the drive path 1L, which is beneficial to reducing the static power consumption of the linear voltage regulator circuit 100.

[0029] The first mirror current module 120 is used to generate a proportional current on the drive path 1L and the regulated output path 2L. For example, it may include a current mirror. Those skilled in the art will understand that the current mirror circuit may include a metal-oxide-semiconductor field-effect transistor (MOSFET) (such as...). Figure 2 The specific circuit topology of the first mirror current module 120 (including transistors M22 and M21) is not limited in this application.

[0030] Please refer to Figure 3In some embodiments, the current limiting module 130 includes a voltage replication unit 131 coupled to the drive path 1L; the voltage replication unit 131 further includes a voltage replication terminal 131a coupled to the voltage output terminal 120c, configured to replicate the voltage of the drive output terminal 120b to the voltage of the voltage output terminal 120c when the input voltage is lower than or equal to a set value of the stable voltage; and to reduce the impedance of the voltage replication unit 131 to a preset impedance value when the input voltage is higher than the set value of the stable voltage. The specific value of the preset impedance will be described in detail in subsequent embodiments. Since the impedance of the voltage replication unit 131 is very low when the input voltage is higher than the set value of the stable voltage, it will not affect the normal operation of the first mirror current module 120.

[0031] exist Figure 3 In the illustrated embodiment, the first current mirroring module 120 includes transistors M31 and M32. The gates of transistors M31 and M32 are interconnected, and the sources of transistors M31 and M32 are both coupled to the input power supply 110. When the input voltage of the input power supply 110 is relatively high, the source-drain voltage difference of the two transistors is relatively high, and both transistors M31 and M32 operate in the saturation region. The current is mirrored according to the size ratio, that is, the drain current I31 of transistor M31 is N times the drain current I32 of transistor M32 (I32=I31 / N). When the input current of the input power supply 110 is less than or equal to the VOSET value (VOSET is the set value of the output voltage of the linear regulator circuit 100, that is, the voltage value that the output voltage of the linear regulator circuit 100 should reach when it is working normally), the gate voltages of transistors M31 and M32 are pulled down to improve the output capability, and therefore the gate-source voltage difference also increases. Transistor M31 enters the linear region, while transistor M32, due to the voltage replication unit 131 replicating the voltage of the drive output terminal 120b to the voltage output terminal 120c, means that the drain voltage of transistor M32 can be equal to the drain voltage of transistor M31. Therefore, transistor M32 can also operate in the linear region like transistor M31. Since transistors M31 and M32 operate in the same state, when the input current of the input power supply 110 is less than or equal to the VOSET value, the drain current I31 of transistor M31 is N times the drain current I32 of transistor M32 (I32=I31 / N), thereby reducing the current in the drive path 1L and helping to reduce the static power consumption of the linear regulator circuit 100.

[0032] When the input voltage is higher than the set value of the stable voltage, the impedance of the voltage replication unit 131 is the preset impedance value. At this time, the gate voltage of transistor M32 is very low, the gate-source voltage difference is large, and the source-drain voltage difference is also large. At this time, both transistor M32 and transistor M33 are working in the saturation region.

[0033] Therefore, the voltage replication unit 131 replicates the voltage of the drive output terminal 120b to the voltage of the voltage output terminal 120c when the input voltage is lower than or equal to the set value of the stable voltage; and reduces the impedance of the voltage replication unit 131 to a preset impedance value when the input voltage is higher than the set value of the stable voltage. This enables the transistor M32 to operate in the linear region when the input voltage is lower than or equal to the set value of the stable voltage, thereby reducing static power consumption, and enables the transistor M32 to operate in the saturation region when the input voltage is higher than the set value of the stable voltage, thereby not affecting the normal operation of the transistor M32.

[0034] The voltage replication unit 131 is grounded through the driving unit 520, which is configured to receive a comparison result signal, and this comparison result signal can be generated by the comparison unit ( Figure 3 Not shown in the image; please refer to the following text. Figure 5 The voltage is obtained by comparing the reference voltage and the voltage at the regulated output terminal 2Lb.

[0035] In some embodiments, please refer to Figure 4 The voltage replication unit 131 includes a first mirror input terminal 131c, a first mirror output terminal 131d, a voltage replication terminal 131a, and a second mirror output terminal 131b. The first mirror input terminal 131c is coupled to the drive input terminal 1La, the first mirror output terminal 131d is coupled to the drive output terminal 120b, the voltage replication terminal 131a is coupled to the voltage output terminal 120c, and the second mirror output terminal 131b is coupled to ground through current bias.

[0036] In some embodiments, the voltage replication unit 131 includes a current mirror circuit.

[0037] Please refer to Figure 4 Through the voltage replication unit 131 including transistors M41 and M42, where transistor M41 is driven by a fixed current source Is4, and transistor M42 forms a current mirror with transistor M41 and is connected in series to the drain terminal of transistor M32, the drain voltage of transistor M32 is VD32 = VD31 - VSG41 + VSG42 (where VD31 is the drain voltage of transistor M31, and VSG41 and VSG42 are the gate-source voltage drops of transistors M41 and M42, respectively). Based on the current flowing through transistors M42 and M41, an appropriate size is selected so that VSG41 = VSG42, and VD32 = VD31 can be obtained, thereby ensuring that the operating states of transistors M31 and M32 are consistent.

[0038] When the input voltage of the input power supply 110 is less than VOSET, the gate voltage of transistor M42 decreases and the impedance of transistor M42 increases, causing the drain voltage of transistor M32 to increase, forcing transistor M32 to synchronously enter the linear region and achieve working state locking. During normal operation, the input voltage of the input power supply 110 is high, and the source-drain voltage difference of transistor M31 is large. At this time, the gate voltage of transistor M42 is very low, and the gate-source voltage difference is large. When transistor M42 is fully turned on (i.e., the impedance is reduced to the preset impedance value), the source-drain voltage difference will be very small and will not affect the normal operation of transistor M32.

[0039] Those skilled in the art will understand that the preset impedance value is the impedance when the transistor M42 is fully turned on, and can be determined according to the specific parameters of the transistor M42. This application does not limit the magnitude of the preset impedance value.

[0040] The voltage replication unit 131 also includes a drive power supply, such as including Figure 4 The current source Is4 in the current mirror circuit is used to provide bias current. The current source Is4 is coupled to the second mirror output terminal 131b and the gate of the transistor connected in opposite directions in the current mirror circuit to provide a drive voltage for the transistor.

[0041] In the above scheme, the current source Is4 only needs to be able to support the operation of transistor M41. Its value is very small and has little impact on the overall static current.

[0042] In some embodiments, please refer to Figure 5 The drive input terminal 1La is coupled to the drive terminal of the transistor connected in opposite directions in the first mirror current module 120; the linear voltage regulator circuit 100 also includes a feedback module coupled to the regulated output terminal 2Lb and the drive input terminal 1La, and connected to a reference voltage; the feedback module is configured to control the voltage of the drive input terminal 1La to control the voltage of the regulated output terminal 2Lb based on the comparison result between the voltage of the regulated output terminal 2Lb and the reference voltage.

[0043] Those skilled in the art will understand that the driving end of a transistor refers to the end used to provide a driving voltage to the transistor. For example, for a MOSFET, the driving end can be the gate; for a bipolar junction transistor (BJT), the driving end can be the base.

[0044] In some embodiments, please refer to Figure 5The feedback module includes a comparison unit 510 and a drive unit 520. The comparison unit 510 is coupled to the regulated output terminal 2Lb and connected to a reference voltage VREF. The comparison unit 510 also includes a result output terminal (not shown in the figure). The comparison unit 510 is configured to compare the voltage of the regulated output terminal 2Lb with the reference voltage and generate the comparison result at the result output terminal. The drive unit 520 includes a control terminal (not shown in the figure), a first conducting terminal (not shown in the figure), and a second conducting terminal (not shown in the figure). The control terminal is coupled to the result output terminal, the first conducting terminal is coupled to the drive input terminal 1La, and the second conducting terminal is coupled to ground. It is configured to control the voltage of the drive input terminal 1La based on the comparison result.

[0045] The comparison unit 510 may include an error amplifier, an operational amplifier, or other integrated circuits with comparison functions. This application does not limit the structure of the comparison unit 510.

[0046] In some embodiments, the drive unit 520 includes an impedance regulator (not shown) comprising a first control terminal (not shown), a first adjustment terminal (not shown), and a second adjustment terminal (not shown). The first control terminal is coupled to the result output terminal, the first adjustment terminal is coupled to the drive input terminal 1La, and the second adjustment terminal is coupled to ground. It is configured to change the impedance of the impedance regulator based on the comparison result, thereby controlling the voltage of the drive input terminal 1La.

[0047] Please refer to Figure 6 The impedance regulator can be a transistor M61, which can be a MOSFET. The comparison result of the comparator unit 510 is output to the gate of the transistor M61. The operating state of the transistor M61 can be changed by altering its gate voltage, for example, controlling the impedance of the transistor M61 in the on-state. Figure 6 In the embodiment shown, the regulated output terminal 2Lb is coupled to the negative terminal of the error amplifier, so that when the output voltage of the regulated output terminal 2Lb decreases, negative feedback is formed through the comparison unit 510 and the driving unit 520, thereby increasing the output voltage of the regulated output terminal 2Lb.

[0048] Please refer to Figure 7 In some embodiments, the drive unit 520 may include a source follower (not shown), including a second control terminal (not shown), a first follower terminal (not shown), and a second follower terminal (not shown). The second control terminal is coupled to the result output terminal, the first follower terminal is coupled to the drive input terminal 1La, and the second follower terminal is coupled to ground. Figure 7As shown, the source follower includes transistors M71 and M72. Assuming transistors M71 and M72 are MOSFETs, and that transistors M71 and M72 have opposite types (e.g., transistor M71 is a P-type MOSFET, and transistor M72 is an N-type MOSFET), then the second control terminal is the gate of transistor M71, the first follower terminal is the source of transistor M71 and the drain of transistor M72, and the second follower terminal is the drain of transistor M71 and the source of transistor M72. Figure 7 In the embodiment shown, the regulated output terminal 2Lb is coupled to the positive terminal of the error amplifier, so that when the output voltage of the regulated output terminal 2Lb decreases, negative feedback is formed through the comparison unit 510 and the driving unit 520, thereby increasing the output voltage of the regulated output terminal 2Lb.

[0049] The above scheme, through the driving unit 520 and the comparison unit 510, achieves negative feedback regulation of the output voltage when the output voltage of the regulated output terminal 2Lb decreases, thereby improving the output stability of the linear voltage regulator circuit 100.

[0050] The second aspect of this application provides an electronic device 800, please refer to... Figure 8 The electronic device 800 may include the linear voltage regulator circuit 100 in any of the above embodiments.

[0051] Electronic device 800 may include various devices that require a stable voltage, such as smartphones, tablets, wearable devices like smartwatches and wristbands, smart home devices like speakers and cameras, and industrial equipment like PLC controllers, motor drivers, and battery management systems. This application does not limit the specific type or structure of electronic device 800.

[0052] Please refer to Figure 9 , Figure 9 The diagram shows the quiescent current (red line) of the linear regulator circuit 100 provided in one embodiment of this application as a function of the input voltage of the input power supply 110, and the quiescent current (black line) of a conventional linear regulator as a function of the input voltage of the input power supply 110. It can be seen that after applying the linear regulator circuit 100 proposed in this application, the quiescent current does not increase significantly when the input voltage is less than VOSET; while in a conventional linear regulator, the quiescent current begins to increase significantly when the input voltage is less than VOSET. Therefore, the linear regulator circuit 100 proposed in this application is beneficial for reducing quiescent power consumption.

[0053] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. A linear voltage regulator circuit, characterized by comprising: include: Input power supply, used to provide input voltage; The first mirror current module has a power input terminal, a drive output terminal and a voltage output terminal, wherein the power input terminal is coupled to the input power supply to access the input voltage; A drive path has a drive input terminal and a ground terminal, wherein the drive input terminal is coupled to the drive output terminal and the ground terminal is grounded; The voltage-regulated output path has a voltage-regulated input terminal and a voltage-regulated output terminal; The regulated input terminal is coupled to the voltage output terminal, and the regulated output terminal is used to connect to the load to provide a stable voltage to the load; A current limiting module is coupled to the drive path; The current limiting module is configured to raise the voltage of the drive output terminal when the input voltage is lower than or equal to a set value of the stable voltage, and to lower the voltage of the drive output terminal when the input voltage is higher than the set value of the stable voltage.

2. The linear voltage regulator circuit of claim 1, wherein, The current limiting module includes: A voltage replication unit is coupled to the drive path; the voltage replication unit further includes a voltage replication terminal coupled to the voltage output terminal, configured to replicate the voltage of the drive output terminal as the voltage of the voltage output terminal when the input voltage is lower than or equal to a set value of the stable voltage; and to reduce the impedance of the voltage replication unit to a preset impedance value when the input voltage is higher than the set value of the stable voltage.

3. The linear voltage regulator circuit according to claim 2, characterized in that, The voltage replication unit includes a first mirror input terminal, a first mirror output terminal, a voltage replication terminal, and a second mirror output terminal. The first mirror input terminal is coupled to the drive input terminal, the first mirror output terminal is coupled to the drive output terminal, the voltage replication terminal is coupled to the voltage output terminal, and the second mirror output terminal is coupled to ground through current bias.

4. The linear voltage regulator circuit of claim 3, wherein, The voltage replication unit includes a current mirror circuit.

5. The linear voltage regulator circuit of claim 4, wherein, The voltage replication unit further includes a drive power supply coupled to the second mirror output terminal and the drive terminal of the transistor connected in opposite directions in the current mirror circuit, so as to provide a drive voltage for the transistor.

6. The linear voltage regulator circuit of claim 1, wherein, Also includes: The drive input terminal is coupled to the drive terminal of the transistor connected in opposite directions in the first mirror current module; The feedback module is coupled to the regulated output terminal and the drive input terminal, and is connected to a reference voltage; The feedback module is configured to control the voltage of the drive input terminal to control the voltage of the regulated output terminal based on a comparison between the voltage of the regulated output terminal and the reference voltage.

7. The linear voltage regulator circuit of claim 6, wherein, The feedback module includes: A comparison unit is coupled to the regulated output terminal and connected to the reference voltage. The comparison unit also includes a result output terminal, configured to compare the voltage of the regulated output terminal with the reference voltage and generate the comparison result at the result output terminal. The driving unit includes a control terminal, a first conducting terminal, and a second conducting terminal; the control terminal is coupled to the result output terminal, the first conducting terminal is coupled to the driving input terminal, and the second conducting terminal is coupled to ground, and is configured to control the voltage of the driving input terminal based on the comparison result.

8. The linear voltage regulator circuit of claim 7, wherein, The driving unit includes: An impedance regulator includes a first control terminal, a first adjustment terminal, and a second adjustment terminal. The first control terminal is coupled to the result output terminal, the first adjustment terminal is coupled to the drive input terminal, and the second adjustment terminal is coupled to ground. The regulator is configured to change the impedance of the impedance regulator based on the comparison result, thereby controlling the voltage of the drive input terminal.

9. The linear voltage regulator circuit of claim 7, wherein, The driving unit includes: The source follower includes a second control terminal, a first follower terminal, and a second follower terminal. The second control terminal is coupled to the result output terminal, the first follower terminal is coupled to the drive input terminal, and the second follower terminal is coupled to ground.

10. An electronic device, comprising: The linear voltage regulator circuit includes any one of claims 1-9.

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