A linear voltage regulator circuit

Abstract

The present application discloses a linear voltage stabilization circuit, including a self-biased bandgap reference circuit, a power output circuit and a feedback circuit. The power output circuit is used to respond to the driving voltage output by the self-biased bandgap reference circuit, and output a stable voltage linearly as the output of the linear voltage stabilization circuit. The feedback circuit is used to feed back the current sampling resistor voltage of the power output circuit to the self-biased bandgap reference circuit. The self-biased bandgap reference circuit is used to generate a reference voltage with a small correlation with the temperature and the power supply Vcc voltage to the power output circuit as the driving voltage of the power output circuit, and is also used to dynamically stabilize the output of the linear voltage stabilization circuit based on the current sampling resistor voltage fed back by the feedback circuit. Since the use of the clamping error amplifier is omitted under the premise of ensuring the stability of the output of the linear voltage stabilization circuit, the power consumption of the linear voltage stabilization circuit is smaller and the circuit structure is simpler.

Description

Technical Field

[0001] The invention relates to the technical field of CMOS integrated circuit design, and in particular to a linear voltage stabilizing circuit. Background Art

[0002] Power MOSFET is a commonly used power device in switching converters, and the size of its loss has a direct impact on the performance and efficiency of switching converters. The loss of power MOSFET is mainly composed of switching loss and conduction loss. Usually we will choose power MOSFET with low on-resistance, high withstand voltage, high gain, low switching loss, and low gate threshold voltage. However, for devices that need to work in linear mode, such as active loads, the above principles are not applicable. Because if the gain of the power MOSFET is too high, considering that its gate threshold voltage has a negative temperature coefficient, it is difficult to keep the drain current constant without applying a negative feedback link, and it may even cause the power MOSFET to be permanently damaged due to thermal breakdown. In the prior art, the power MOSFET of the linear voltage regulator circuit is driven by the control circuit through the drive circuit, and the on-resistance of the power tube is adjusted by adjusting the drive voltage of the tube, so as to achieve a regulated output. Generally, a bandgap reference circuit is used to generate a reference voltage, and an error amplifier is used for clamping. Finally, the output stage is a power tube to obtain the required output signal with a certain load capacity. However, this linear voltage regulator circuit has the following defects:

[0003] 1) The static power consumption is relatively large. The power consumption of the overall circuit includes the static power consumption of the bandgap reference circuit, the static power consumption of the error amplifier, and the static power consumption of the output stage.

[0004] 2) The linear voltage regulator circuit has many structural components and complex circuits. In addition, the loop state is different under different load conditions, requiring complex loop analysis and compensation circuit design. Summary of the invention

[0005] The present application provides a linear voltage stabilization circuit to solve the defects of the linear voltage stabilization circuit in the prior art.

[0006] According to the first aspect, an embodiment provides a linear voltage stabilization circuit, comprising:

[0007] It includes a self-biased bandgap reference circuit, a power output circuit and a feedback circuit;

[0008] The power output circuit includes a driving voltage input terminal, a power voltage output terminal and a feedback circuit connection terminal; the driving voltage input terminal is connected to the self-biased bandgap reference circuit, the power voltage output terminal is used as the output terminal of the linear voltage regulator circuit, and the feedback circuit connection terminal is connected to the feedback circuit; the power output circuit is used to respond to the driving voltage output by the self-biased bandgap reference circuit and output a linearly stabilized voltage as the output of the linear voltage regulator circuit;

[0009] The feedback circuit includes a power output circuit connection end and a bandgap reference circuit connection end; the power output circuit connection end is connected to the feedback circuit connection end of the power output circuit, and the bandgap reference circuit connection end is connected to the self-biased bandgap reference circuit; the feedback circuit is used to feed back the current sampling resistor voltage of the power output circuit to the self-biased bandgap reference circuit;

[0010] The self-biased bandgap reference circuit includes a first voltage output terminal and a second voltage output terminal; the first voltage output terminal is connected to the driving voltage input terminal of the power output circuit, and the second voltage output terminal is connected to the bandgap reference circuit connection terminal of the feedback circuit; the self-biased bandgap reference circuit is used to generate a reference voltage with a small correlation with temperature and power supply Vcc voltage to the power output circuit, so as to serve as the driving voltage of the power output circuit; the self-biased bandgap reference circuit is also used to dynamically stabilize the output of the linear voltage stabilization circuit based on the current sampling resistor voltage fed back by the feedback circuit.

[0011] Further, the self-biased bandgap reference circuit includes a first transistor P11, a second transistor P12, a third transistor Q11, a fourth transistor Q12, a resistor R11 and a resistor R12; the first electrode of the first transistor P11 is connected to the first electrode of the second transistor P12, and is used for inputting the power supply Vcc of the linear voltage regulator circuit; the control electrode of the first transistor P11 is connected to the control electrode of the second transistor P12; the control electrode of the first transistor P11 is connected to the second electrode; the second electrode of the second transistor P12 serves as the first voltage output terminal of the self-biased bandgap reference circuit; the first electrode of the third transistor Q11 is connected to the second electrode of the first transistor P11, the control electrode of the third transistor Q11 is connected to the control electrode of the fourth transistor Q12, and is used as the second voltage output terminal of the self-biased bandgap reference circuit; the resistor R11 is connected between the second electrode of the third transistor Q11 and the second electrode of the fourth transistor Q12; the first electrode of the fourth transistor Q12 is connected to the second electrode of the second transistor P12, and the resistor R12 is connected between the second electrode of the fourth transistor Q12 and the zero reference potential point GND.

[0012] Furthermore, the first transistor P11 and / or the second transistor P12 is a PMOS transistor.

[0013] Furthermore, the third transistor Q11 and / or the fourth transistor Q12 is an NPN transistor.

[0014] Further, the power output circuit includes a fifth transistor N21; the first electrode of the fifth transistor N21 is used for the input of the power supply Vcc of the linear voltage regulator circuit, the second electrode of the fifth transistor N21 is used as the power voltage output end and the feedback circuit connection end of the power output circuit, and the control electrode of the fifth transistor N21 is used as the driving voltage input end of the power output circuit.

[0015] Furthermore, the fifth transistor N21 is an NMOS transistor.

[0016] Further, the power output circuit includes a fifth transistor N21 and a sixth transistor N22; the first electrode of the fifth transistor N21 is used for inputting the power supply Vcc of the linear voltage regulator circuit, the second electrode of the fifth transistor N21 is used as a feedback circuit connection terminal of the power output circuit, and the control electrode of the fifth transistor N21 is used as a driving voltage input terminal of the power output circuit;

[0017] The control electrode of the sixth transistor N22 is connected to the control electrode of the fifth transistor N21, the first electrode of the sixth transistor N22 is used for inputting the power supply Vcc of the linear voltage regulator circuit, and the second electrode of the sixth transistor N22 is used as the power voltage output terminal of the power output circuit.

[0018] Furthermore, the fifth transistor N21 and / or the sixth transistor N22 is an NMOS transistor.

[0019] Further, the feedback circuit includes a resistor R21 and a resistor R22; one end of the resistor R21 is used as a power output circuit connection end of the feedback circuit, and the other end is used as a bandgap reference circuit connection end of the feedback circuit; one end of the resistor R22 is connected to the bandgap reference circuit connection end of the feedback circuit, and the other end is used to be connected to the zero reference potential point GND.

[0020] Furthermore, the resistor R21 and / or the resistor R22 are adjustable resistors.

[0021] A linear voltage regulator circuit according to the above embodiment includes a self-biased bandgap reference circuit, a power output circuit and a feedback circuit. The power output circuit is used to respond to the driving voltage output by the self-biased bandgap reference circuit and output a stable voltage linearly as the output of the linear voltage regulator circuit. The feedback circuit is used to feed back the current sampling resistor voltage of the power output circuit to the self-biased bandgap reference circuit. The self-biased bandgap reference circuit is used to generate a reference voltage with a small correlation with the temperature and the power supply Vcc voltage to the power output circuit as the driving voltage of the power output circuit, and is also used to dynamically stabilize the output of the linear voltage regulator circuit based on the current sampling resistor voltage fed back by the feedback circuit. Since the use of the clamping error amplifier is omitted under the premise of ensuring the stability of the output of the linear voltage regulator circuit, the power consumption of the linear voltage regulator circuit is smaller and the circuit structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a circuit connection schematic diagram of a linear voltage stabilizing circuit;

[0023] Figure 2 A circuit connection diagram of a linear voltage stabilizing circuit in an embodiment;

[0024] Figure 3 It is a circuit connection diagram of a linear voltage stabilizing circuit in another embodiment. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0026] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0027] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0028] Please refer to Figure 1 , which is a circuit structure diagram of a linear voltage regulator circuit, including a power output circuit 1, an error amplifier 2 and a bandgap reference circuit (BGR) 3. The voltage regulation principle of the linear voltage regulator circuit is to use the bandgap reference circuit 3 to generate a reference voltage V with little correlation with temperature and power supply voltage. bgr , using error amplifier 2 to clamp the voltage V i =V bgr , and then use the voltage divider resistor R1 and resistor R2 of the power output circuit 1 to get the required output voltage V o , then V o =(R1+R2)*(V i / R2).

[0029] It can be seen from the above that the static power consumption of the entire linear voltage regulator circuit includes the static power consumption of the bandgap reference circuit, the static power consumption of the error amplifier, and the static power consumption of the power output stage branch. If the power consumption of the above linear voltage regulator circuit is to be reduced, it is necessary to improve the power output circuit 1, the error amplifier 2 and the bandgap reference circuit 3 respectively, which includes:

[0030] 1) To reduce the power consumption of the bandgap reference circuit, it is necessary to reduce the current of each branch of the linear voltage regulator circuit, which requires increasing the number of resistors and thus increasing the area of ​​the circuit layout;

[0031] 2) Reduce the power consumption of the error amplifier. Reducing the static power consumption of the error amplifier will limit the response speed of the op amp and increase the difficulty of the overall loop design.

[0032] 3) Reducing the power consumption of the output circuit will cause the same problem as reducing the power consumption of the bandgap reference circuit, which will increase the resistance value and thus increase the area of ​​the circuit layout.

[0033] In an embodiment of the present application, a linear voltage stabilization circuit is disclosed, including a self-biased bandgap reference circuit, a power output circuit, and a feedback circuit. The power output circuit is used to respond to the driving voltage output by the self-biased bandgap reference circuit, and output a stable voltage linearly as the output of the linear voltage stabilization circuit. The feedback circuit is used to feed back the current sampling resistor voltage of the power output circuit to the self-biased bandgap reference circuit. The self-biased bandgap reference circuit is used to generate a reference voltage with a small correlation with temperature and power supply Vcc voltage to the power output circuit as the driving voltage of the power output circuit, and is also used to dynamically stabilize the output of the linear voltage stabilization circuit based on the current sampling resistor voltage fed back by the feedback circuit. The circuit structure is optimized to achieve the purpose of eliminating the error amplifier part and thus reducing power consumption.

[0034] The following is an explanation of some terms involved in this application.

[0035] The transistor in this application can be a transistor of any structure, such as a metal-oxide semiconductor field-effect transistor, abbreviated as metal-oxide-semiconductor field-effect transistor (MOSFET), which is a field-effect transistor that can be widely used in analog circuits and digital circuits. MOSFET can be divided into two types, "N-type" and "P-type", according to the polarity of its "channel" (working carrier), usually called NMOSFET and PMOSFET, and other abbreviations include NMOS, PMOS, etc. Another example is a bipolar transistor (BJT) or a field effect transistor (FET). When the transistor is a bipolar transistor, its control electrode refers to the gate of the bipolar transistor, the first electrode can be the collector or emitter of the bipolar transistor, and the corresponding second electrode can be the emitter or collector of the bipolar transistor. In actual application, the "emitter" and "collector" can be interchanged according to the signal flow direction; when the transistor is a field effect transistor, its control electrode refers to the gate of the field effect transistor, the first electrode can be the drain or source of the field effect transistor, and the corresponding second electrode can be the source or drain of the field effect transistor. In actual application, the "source" and "drain" can be interchanged according to the signal flow direction.

[0036] Embodiment 1

[0037] Please refer to Figure 2, is a circuit connection diagram of a linear voltage regulator circuit in an embodiment, including a self-biased bandgap reference circuit 10, a power output circuit 20 and a feedback circuit 30. The power output circuit 20 includes a driving voltage input terminal, a power voltage output terminal and a feedback circuit connection terminal. The driving voltage input terminal is connected to the self-biased bandgap reference circuit 10, the power voltage output terminal is used as the output terminal of the linear voltage regulator circuit, and the feedback circuit connection terminal is connected to the feedback circuit 30. The power output circuit 20 is used to respond to the driving voltage output by the self-biased bandgap reference circuit 10, and output a linearly stabilized voltage as the output of the linear voltage regulator circuit. The feedback circuit 30 includes a power output circuit connection terminal and a bandgap reference circuit connection terminal, the power output circuit connection terminal is connected to the feedback circuit connection terminal of the power output circuit 20, and the bandgap reference circuit connection terminal is connected to the self-biased bandgap reference circuit 10. The feedback circuit 30 is used to feed back the current sampling resistor voltage of the power output circuit 20 to the self-biased bandgap reference circuit 10. The self-biased bandgap reference circuit 10 includes a first voltage output terminal and a second voltage output terminal, wherein the first voltage output terminal is connected to the driving voltage input terminal of the power output circuit 20, and the second voltage output terminal is connected to the bandgap reference circuit connection terminal of the feedback circuit 30. The self-biased bandgap reference circuit 10 is used to generate a reference voltage with a small correlation with temperature and power supply Vcc voltage to the power output circuit 20, so as to serve as the driving voltage of the power output circuit 20. The self-biased bandgap reference circuit 10 is also used to dynamically stabilize the output of the linear voltage regulator circuit based on the current sampling resistor voltage of the feedback circuit 30.

[0038] The self-biased bandgap reference circuit 10 includes a first transistor P11, a second transistor P12, a third transistor Q11, a fourth transistor Q12, a resistor R11 and a resistor R12. The first electrode of the first transistor P11 is connected to the first electrode of the second transistor P12 and is used for inputting the power supply Vcc of the linear voltage regulator circuit. The control electrode of the first transistor P11 is connected to the control electrode of the second transistor P12. The control electrode of the first transistor P11 is connected to the second electrode. The second electrode of the second transistor P12 serves as the first voltage output terminal of the self-biased bandgap reference circuit 10. The first electrode of the third transistor Q11 is connected to the second electrode of the first transistor P11, and the control electrode of the third transistor Q11 is connected to the control electrode of the fourth transistor Q12, and is used as the second voltage output terminal of the self-biased bandgap reference circuit 10. The resistor R11 is connected between the second electrode of the third transistor Q11 and the second electrode of the fourth transistor Q12. The first electrode of the fourth transistor Q12 is connected to the second electrode of the second transistor P12, and the resistor R12 is connected between the second electrode of the fourth transistor Q12 and the zero reference potential point GND. In one embodiment, the first transistor P11 and the second transistor P12 are PMOS transistors. In one embodiment, the third transistor Q11 and the fourth transistor Q12 are NPN transistors.

[0039] The power output circuit 20 includes a fifth transistor N21. The first electrode of the fifth transistor N21 is used for inputting the power supply Vcc of the linear voltage regulator circuit, the second electrode of the fifth transistor N21 is used as the power voltage output terminal and the feedback circuit connection terminal of the power output circuit 20, and the control electrode of the fifth transistor N21 is used as the driving voltage input terminal of the power output circuit 20. In one embodiment, the fifth transistor N21 is an NMOS tube.

[0040] Please refer to Figure 3 , is a circuit connection diagram of a linear voltage regulator circuit in another embodiment. In one embodiment, the power output circuit 20 includes a fifth transistor N21 and a sixth transistor N22. The first electrode of the fifth transistor N21 is used for inputting the power supply Vcc of the linear voltage regulator circuit, the second electrode of the fifth transistor N21 is used as the feedback circuit connection terminal of the power output circuit 20, and the control electrode of the fifth transistor N21 is used as the driving voltage input terminal of the power output circuit 20. The control electrode of the sixth transistor N22 is connected to the control electrode of the fifth transistor N21, the first electrode of the sixth transistor N22 is used for inputting the power supply Vcc of the linear voltage regulator circuit, and the second electrode of the sixth transistor N22 is used as the power voltage output terminal of the power output circuit 20. The fifth transistor N21 and the sixth transistor N22 constitute an output source follower circuit. In one embodiment, the fifth transistor N21 and the sixth transistor N22 are NMOS tubes.

[0041] The feedback circuit 30 includes a resistor R21 and a resistor R22. One end of the resistor R21 is used as a power output circuit connection end of the feedback circuit 30, and the other end is used as a bandgap reference circuit connection end of the feedback circuit 30. One end of the resistor R22 is connected to the bandgap reference circuit connection end of the feedback circuit 30, and the other end is used to be connected to the zero reference potential point GND. In one embodiment, the resistor R21 and / or the resistor R22 are adjustable resistors.

[0042] In the embodiment of the present application, the linear voltage regulator circuit includes a self-biased bandgap reference circuit 10, a power output circuit 20 and a feedback circuit 30. The electronic devices constituting the linear voltage regulator circuit are easy to implement in a standard CMOS process, and the circuit structure is simplified. The overall loop stability is good and the output voltage consistency is good. The branch currents I1, I2, I3 and the node voltages V1, V2, V3, V4, V bgr like Figure 3 As shown in the figure, the basic principle of the bandgap reference circuit is to use the positive temperature characteristic of the transistor △VBE and the negative temperature characteristic of the transistor VBE to construct the positive temperature characteristic voltage and the negative temperature characteristic voltage superposition, and to obtain a zero temperature coefficient voltage V by adjusting the proportional coefficient of the positive temperature characteristic and the proportional coefficient of the negative temperature characteristic. bgrIn the embodiment of the present application, the detailed working process of the self-biased bandgap reference circuit is as follows:

[0043] The first transistor P11 and the second transistor P12 are PMOS transistors forming a current mirror. If the ratio of the first transistor P11 to the second transistor P12 is 1:1, the currents in the two branches where the first transistor P11 and the second transistor P12 are located are equal, that is, I1=I2. The third transistor Q11 and the fourth transistor Q12 are NPN transistors. The current I1 flows through the third transistor Q11, and the base-emitter voltage V generated by the third transistor Q11 is BE1 =V bgr -V3. The current I2 flows through the fourth transistor Q12, generating a base-emitter voltage V BE2 =V bgr -V4. Thus, the voltage across the resistor R11 can be obtained as:

[0044] V3-V4=V BE2 -V BE1 ,

[0045] V BE2 -V BE1 It can be recorded as △V BE , if the ratio of the third transistor Q11 to the fourth transistor Q12 is m:1, it can be calculated:

[0046] △V BE =VT*ln(m), where m>1, VT=k*T / q. The value of the resistor R11 can be used to determine the size of the branch current I1:

[0047] I1=△V BE / R11= VT*ln(m) / R11,

[0048] From the previous analysis, we can get the current value of I2: I2=I1. From the circuit structure, we can know that both currents I1 and I2 flow through resistor R12, and then we can get the voltage value of V4:

[0049] V4=(I1+I2)*R12=2*I1*R12=2*△V BE *R12 / R11.

[0050] Finally, we get the bandgap reference voltage V we need bgr =V4+V BE2 , substituting the voltage expression of V4 into the equation, we get:

[0051] V bgr =2*△V BE *R12 / R11+V BE2 ,

[0052] △V of transistor BE For positive temperature characteristics, transistor V BE2 The negative temperature characteristic can be adjusted by adjusting the value of resistor R12 and resistor R11 to adjust the proportional coefficient of the positive temperature characteristic. Thus, a voltage V with a zero temperature coefficient can be obtained. bgr The design of the self-biased bandgap reference circuit uses only two NPN transistors, two PMOS transistors and two resistors to construct the bandgap reference voltage V bgr With △V BE and V BE Compared with the traditional bandgap reference circuit, this structure reduces the use of operational amplifiers and triodes. This structure has the characteristics of fewer branches, simple circuit structure, and good stability. There is no additional bias branch, which greatly reduces the power consumption of the overall circuit.

[0053] like Figure 3 As shown, the feedback loop principle of the linear voltage regulator circuit is:

[0054] The fifth transistor N21, the resistor R21 and the resistor R22 and the output source follower part of the sixth transistor N22 can obtain an output voltage V O . V bgr The voltage is directly connected to the connection terminal of resistor R21 and resistor R22, so the voltage V1 can be calculated as:

[0055] V1=(R21+R22)*(V bgr / R22),

[0056] Output voltage V O for:

[0057] V O =V1+Vgsn1-Vgsn2,

[0058] Where Vgsn1 is the gate-source voltage of the fifth transistor N21, and Vgsn2 is the gate-source voltage of the sixth transistor N22. If Vgsn1=Vgsn2, the output voltage V O for:

[0059] V O =V1=(R21+R22)*(V bgr / R22).

[0060] And the branch current is:

[0061] I3=V bgr / R22,

[0062] The current of I3 can be adjusted by adjusting the value of resistor R22, and the desired output voltage V can be obtained by adjusting the values ​​of resistors R21 and R22.O .

[0063] In summary, the overall static power consumption of the linear voltage regulator circuit is I=I1+I2+I3, there are only three current branches, and the overall circuit power consumption can be adjusted by adjusting the values ​​of resistors R11 and R22. The output voltage is stable and the output voltage consistency is good. In summary, the circuit can obtain ultra-low power linear voltage regulator output, which can meet the requirements of low power consumption, simple circuit structure, and good output voltage stability.

[0064] In an embodiment of the present application, a linear voltage regulator circuit is disclosed, including a self-biased bandgap reference circuit, a power output circuit and a feedback circuit. Among them, the power output circuit is used to respond to the driving voltage output by the self-biased bandgap reference circuit, and output a stable voltage according to the linear output as the output of the linear voltage regulator circuit. The feedback circuit is used to feed back the current sampling resistor voltage of the power output circuit to the self-biased bandgap reference circuit. The self-biased bandgap reference circuit is used to generate a reference voltage with a small correlation with the temperature and the power supply Vcc voltage to the power output circuit as the driving voltage of the power output circuit, and is also used to dynamically stabilize the output of the linear voltage regulator circuit based on the current sampling resistor voltage fed back by the feedback circuit. Compared with the traditional linear voltage regulator circuit, the circuit structure is optimized. On the one hand, the circuit connection relationship is used to eliminate the use of the clamp error amplifier to reduce power consumption. On the other hand, the bandgap reference circuit is optimized, and a self-biased structure is adopted to reduce current branches to reduce power consumption. In the final output part, a source follower structure is adopted to isolate the feedback loop from the output load, reduce the impact of load switching on the loop, thereby simplifying the analysis and compensation design of the feedback loop. The biggest advantage of this application is that it greatly reduces the power consumption of the overall linear voltage regulator circuit, secondly simplifies the circuit, enhances the stability of the circuit, and finally optimizes the layout area, saving overall costs. The circuit consistency is good, which can simplify subsequent production testing.

[0065] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A linear voltage stabilizing circuit, characterized in that: It includes a self-biased bandgap reference circuit, a power output circuit and a feedback circuit; The power output circuit includes a driving voltage input terminal, a power voltage output terminal and a feedback circuit connection terminal; the driving voltage input terminal is connected to the self-biased bandgap reference circuit, the power voltage output terminal is used as the output terminal of the linear voltage regulator circuit, and the feedback circuit connection terminal is connected to the feedback circuit; the power output circuit is used to respond to the driving voltage output by the self-biased bandgap reference circuit and output a linearly stabilized voltage as the output of the linear voltage regulator circuit; The feedback circuit includes a power output circuit connection end and a bandgap reference circuit connection end; the power output circuit connection end is connected to the feedback circuit connection end of the power output circuit, and the bandgap reference circuit connection end is connected to the self-biased bandgap reference circuit; the feedback circuit is used to feed back the current sampling resistor voltage of the power output circuit to the self-biased bandgap reference circuit; The feedback circuit includes a resistor R21 and a resistor R22; one end of the resistor R21 is used as a power output circuit connection end of the feedback circuit, and the other end is used as a bandgap reference circuit connection end of the feedback circuit; one end of the resistor R22 is connected to the bandgap reference circuit connection end of the feedback circuit, and the other end is used to be connected to the zero reference potential point GND; The self-biased bandgap reference circuit includes a first voltage output terminal and a second voltage output terminal; the first voltage output terminal is connected to the driving voltage input terminal of the power output circuit, and the second voltage output terminal is connected to the bandgap reference circuit connection terminal of the feedback circuit; the self-biased bandgap reference circuit is used to generate a reference voltage with a small correlation with temperature and power supply Vcc voltage to the power output circuit, so as to serve as the driving voltage of the power output circuit; the self-biased bandgap reference circuit is also used to dynamically stabilize the output of the linear voltage stabilization circuit based on the current sampling resistor voltage fed back by the feedback circuit; The self-biased bandgap reference circuit includes a first transistor P11, a second transistor P12, a third transistor Q11, a fourth transistor Q12, a resistor R11 and a resistor R12; the first electrode of the first transistor P11 is connected to the first electrode of the second transistor P12, and is used for inputting the power supply Vcc of the linear voltage regulator circuit; the control electrode of the first transistor P11 is connected to the control electrode of the second transistor P12; the control electrode of the first transistor P11 is connected to the second electrode; the second electrode of the second transistor P12 serves as the first voltage output terminal of the self-biased bandgap reference circuit; the first electrode of the third transistor Q11 is connected to the second electrode of the first transistor P11, the control electrode of the third transistor Q11 is connected to the control electrode of the fourth transistor Q12, and is used as the second voltage output terminal of the self-biased bandgap reference circuit; the resistor R11 is connected between the second electrode of the third transistor Q11 and the second electrode of the fourth transistor Q12; the first electrode of the fourth transistor Q12 is connected to the second electrode of the second transistor P12, and the resistor R12 is connected between the second electrode of the fourth transistor Q12 and the zero reference potential point GND.

2. The linear voltage regulator circuit according to claim 1, characterized in that: The first transistor P11 and / or the second transistor P12 is a PMOS transistor.

3. The linear voltage regulator circuit according to claim 1, characterized in that: The third transistor Q11 and / or the fourth transistor Q12 is an NPN transistor.

4. The linear voltage regulator circuit according to claim 1, characterized in that: The power output circuit includes a fifth transistor N21; the first electrode of the fifth transistor N21 is used for the input of the power supply Vcc of the linear voltage regulator circuit, the second electrode of the fifth transistor N21 is used as the power voltage output terminal and feedback circuit connection terminal of the power output circuit, and the control electrode of the fifth transistor N21 is used as the driving voltage input terminal of the power output circuit.

5. The linear voltage stabilizing circuit according to claim 4, characterized in that: The fifth transistor N21 is an NMOS transistor.

6. The linear voltage stabilizing circuit according to claim 1, characterized in that: The power output circuit includes a fifth transistor N21 and a sixth transistor N22; the first electrode of the fifth transistor N21 is used for inputting the power supply Vcc of the linear voltage regulator circuit, the second electrode of the fifth transistor N21 is used as a feedback circuit connection terminal of the power output circuit, and the control electrode of the fifth transistor N21 is used as a driving voltage input terminal of the power output circuit; The control electrode of the sixth transistor N22 is connected to the control electrode of the fifth transistor N21, the first electrode of the sixth transistor N22 is used for inputting the power supply Vcc of the linear voltage regulator circuit, and the second electrode of the sixth transistor N22 is used as the power voltage output terminal of the power output circuit.

7. The linear voltage stabilizing circuit according to claim 6, characterized in that: The fifth transistor N21 and / or the sixth transistor N22 is an NMOS transistor.

8. The linear voltage regulator circuit according to claim 1, characterized in that: The resistor R21 and / or the resistor R22 are adjustable resistors.

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