A multi-cross-coupling feedback low-dropout voltage regulator circuit and a low-dropout voltage regulator

Abstract

The present invention discloses a multi-cross-coupled feedback low-dropout voltage regulator circuit and a low-dropout voltage regulator, comprising a level-flip follower circuit, a multi-cross-coupled feedback loop, and an auxiliary voltage regulator circuit, wherein the level-flip follower circuit, the multi-cross-coupled feedback loop, and the auxiliary voltage regulator circuit are connected in sequence. By using the present invention, it is possible to achieve output voltage stability by improving the transient response performance of the low-dropout voltage regulator. As a multi-cross-coupled feedback low-dropout voltage regulator circuit and a low-dropout voltage regulator, the present invention can be widely used in the field of integrated circuit power management technology.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuit power management, and in particular to a multi-cross-coupling feedback low-voltage-dropout voltage stabilizing circuit and a low-voltage-dropout voltage stabilizer. Background Art

[0002] With the rapid development of integrated circuits, low-dropout (LDO) regulators are widely used in SoC chip design as important power management modules. The traditional typical LDO regulator structure includes a reference voltage (usually implemented by a bandgap reference circuit), an error amplifier, a power tube, and a feedback resistor. The stability of the power supply has a great impact on the performance of the circuit. With the rapid development of high-precision applications such as aerospace, aviation, and nuclear energy, the operating environment of electronic instruments has become increasingly complex, and the requirements for power supply have also increased accordingly. A stable power supply can enable electronic instruments to operate normally and minimize the impact of the external environment and circuit load changes on electronic instruments. An unstable power supply may cause the performance of electronic instruments to deteriorate, some internal circuits to malfunction, and even damage internal electronic components. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a multi-cross-coupled feedback low-dropout voltage regulator circuit and a low-dropout voltage regulator, which can achieve output voltage stability by improving the transient response performance of the low-dropout voltage regulator.

[0004] The first technical solution adopted by the present invention is: a multi-cross-coupled feedback low-dropout voltage regulator circuit, comprising a level-flipping follower circuit, a multi-cross-coupled feedback loop, and an auxiliary voltage regulator circuit, wherein the level-flipping follower circuit, the multi-cross-coupled feedback loop, and the auxiliary voltage regulator circuit are connected in sequence:

[0005] The level-flip follower circuit includes a first-stage loop and a second-stage loop;

[0006] The compared voltage signal is input to the first-stage loop, the first-stage loop converts the compared voltage signal into a current signal, and the current signal is input to the second-stage loop;

[0007] The second-stage loop scales the current signal and charges and discharges the parasitic capacitance in the first-stage loop through the processed current signal to output a final output voltage.

[0008] The multi-cross-coupled feedback loop is used to obtain a voltage change signal at the load end, amplify the voltage change signal to obtain an amplified voltage change signal, and transmit the amplified voltage change signal to the auxiliary voltage regulator circuit;

[0009] The auxiliary voltage regulator circuit includes a third-level loop and a fourth-level loop;

[0010] The third-level loop is a comparator;

[0011] The fourth-stage loop is used to compare and process the amplified voltage change signal with the reference voltage signal, and feed back the compared voltage signal to the level-flip follower circuit through the auxiliary voltage regulator circuit.

[0012] Furthermore, the first-stage loop and the second-stage loop include a power tube Mp, a power tube M1A, a power tube M3B, a power tube M5A, a power tube M6A, a power tube M7, a power tube M8, a power tube M9, a power tube M10, and a power tube M11, wherein the power tube Mp, the power tube M1A, the power tube M3B, the power tube M5A, and the power tube M6A constitute the first-stage loop, and the power tube M7, the power tube M8, the power tube M9, the power tube M10, and the power tube M11 constitute the second-stage loop.

[0013] Furthermore, in the second-stage loop of the level-flip follower circuit, a proportional current mirror is constructed based on the power tube M9, the power tube M10, and the power tube M11 to perform scaling processing on the current signal.

[0014] Furthermore, in the level-flip follower circuit, the source of the power tube M1A is respectively connected to the drain of the power tube Mp and the multi-cross-coupled feedback loop, the drain of the power tube M1A is respectively connected to the drain of the power tube M3B and the source of the power tube M5A, the gate of the power tube M1A is connected to the multi-cross-coupled feedback loop, the source of the power tube M3B is grounded, the gate of the power tube M3B is connected to the multi-cross-coupled feedback loop, the gate of the power tube M5A is connected to the reference voltage Vref, the drain of the power tube M5A is respectively connected to the gate of the power tube M8 and the drain of the power tube M6A, and the source of the power tube M6A is connected to VIN The gate of the power tube M6A is respectively connected to the gate of the power tube M7 and the gate and drain of the power tube M6B in the auxiliary regulator circuit. The source of the power tube M7 is connected to VIN. The drain of the power tube M7 is respectively connected to the drain of the power tube M11 and the gate of the power tube Mp. The source of the power tube M8 is connected to VIN. The drain of the power tube M8 is respectively connected to the drain of the power tube M9, the gate of the power tube M10, and the gate of the power tube M11. The gate of the power tube M9 is connected to the bias voltage VB1. The source of the power tube M9 is connected to the drain of the power tube M10. The source of the power tube M10 and the source of the power tube M11 are grounded.

[0015] Furthermore, the multi-cross-coupled feedback loop includes a power tube M1B, a power tube M1C, a power tube M2C, a power tube M2B, a power tube M3A, a power tube M4A, resistors R0 and R1, wherein the source of the power tube M1A in the level-flip follower circuit is respectively connected to the drain of the power tube Mp, the source of the power tube M2C, and the source of the power tube M2B, the gate of the power tube M1A in the level-flip follower circuit is respectively connected to the gate of the power tube M1B, the gate and drain of the power tube M1C, the gate of the power tube M3B in the level-flip follower circuit is respectively connected to the resistor R1 and the drain of the power tube M2B, the source of the power tube M1B is respectively connected to the source of the power tube M1C, the gate of the power tube M14 in the auxiliary regulator circuit, the source of the power tube M2A in the auxiliary regulator circuit, and the drain of the power tube Mbuff in the auxiliary regulator circuit, and the gate of the power tube M1B is respectively connected to the drain of the power tube M1B. The electrodes are respectively connected to the gate of the power tube M1C, the drain of the power tube M1C, and the gate of the power tube M1A in the auxiliary voltage regulator circuit; the drain of the power tube M1B is connected to the drain of the power tube M3A and the first end of the resistor R0; the source of the power tube M2B is respectively connected to the source of the power tube M2C, the drain of the power tube Mp in the level-flip follower circuit, and the source of the power tube M1A in the level-flip follower circuit; the gate of the power tube M2B is respectively connected to the gate of the power tube M2C, the drain of the power tube M2C, and the gate of the power tube M2A in the auxiliary voltage regulator circuit; the drain of the power tube M2B is respectively connected to the drain of the power tube M4A and the first end of the resistor R1; the second end of the resistor R0 and the second end of the resistor R1 are respectively connected between the gate and drain of the power tube M3A and the gate and drain of the power tube M4A; the gate of the power tube M3A is connected to the gate of the power tube M4A.

[0016] Furthermore, the third-level loop and the fourth-level loop include a power tube Mbuff, a power tube M12, a power tube M13, a power tube M14, a power tube M15, a power tube M16, a power tube M17, a power tube M2A, a power tube M4B, a power tube M5B, a power tube M6B and a resistor R3, wherein the resistor R3, the power tube M12, the power tube M13, the power tube M14, the power tube M15, the power tube M16 and the power tube M17 constitute the third-level loop, and the power tube Mbuff, the power tube M2A, the power tube M4B, the power tube M5B and the power tube M6B constitute the fourth-level loop.

[0017] Furthermore, in the third-stage loop of the auxiliary voltage regulator circuit, a bias current source is constructed based on the power tube M16, the power tube M17, and the resistor R3 to provide current to the third-stage loop of the auxiliary voltage regulator circuit, while allowing the sum of the currents flowing through the power tube M14 and the power tube M15 in the third-stage loop of the auxiliary voltage regulator circuit to be constant.

[0018] Furthermore, in the auxiliary voltage regulator circuit, the drain of the power tube Mbuff is connected to the source of the power tube M2A, the source of the power tube Mbuff is connected to the power supply VIN, the gate of the power tube Mbuff is respectively connected to the drain of the power tube M15 and the drain of the power tube M13, the source of the power tube M12 is connected to the power supply VIN, the gate of the power tube M12 is respectively connected to the drain of the power tube M12, the drain of the power tube M14 and the gate of the power tube M13, the source of the power tube M13 is connected to the power supply VIN, and the power tube M1 The drain of the power tube M3 is respectively connected to the gate of the power tube Mbuff and the drain of the power tube M15, the gate of the power tube M14 is respectively connected to the source of the power tube M1C in the multi-cross-coupled feedback loop and the source of the power tube M1B in the multi-cross-coupled feedback loop, the source of the power tube M14 is respectively connected to the drain of the power tube M16 and the source of the power tube M15, the gate of the power tube M15 is connected to the reference power supply Vref, the source of the power tube M16 is grounded, and the gate of the power tube M16 is respectively connected to the gate of the power tube M17 and the drain of the power tube M17.

[0019] The second technical solution adopted by the present invention is: a low-dropout voltage regulator, comprising the multi-cross-coupling feedback low-dropout voltage regulator circuit as described above.

[0020] The beneficial effects of the circuit and device of the present invention are as follows: the present invention reduces the undershoot and overcharge of the output voltage caused by load changes by adopting multiple cross-coupled feedback loops, improves the transient response performance of the low-dropout voltage regulator, and then compares the changed voltage with the reference voltage through the auxiliary voltage regulator circuit, and finally outputs a stable voltage through the level-flip follower circuit. The circuit of the present invention does not require a complex operational amplifier, but instead adopts multiple cross-coupled feedback loops to quickly charge and discharge the parasitic capacitance of the power tube gate, thereby quickly raising the output voltage to achieve a stable voltage output, avoiding the large dive or overshoot voltage at the output end caused by the large gain error amplifier in the traditional low-dropout voltage regulator when the load changes. At the same time, the circuit structure of the present invention has a transient current enhancement function, which can ensure a sufficiently fast voltage transient response. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a multi-cross-coupling feedback low-dropout voltage stabilizing circuit of the present invention;

[0022] Figure 2 It is a circuit structure diagram of a traditional low voltage dropout regulator circuit. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are provided for ease of description only and do not limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted based on the understanding of those skilled in the art.

[0024] like Figure 2 As shown, a conventional low-dropout voltage regulator circuit includes a reference circuit and an error amplifier. The reference circuit often includes a complex error amplifier, and the output end of the complex error amplifier causes an unstable output voltage. Therefore, the circuit structure proposed in the present invention does not require a reference circuit and a complex error amplifier, thereby avoiding the large dive or overshoot voltage at the output end caused by the large gain error amplifier in the classic low-dropout voltage regulator when the load changes. At the same time, it has a transient current enhancement structure. In addition, the circuit of the present invention establishes a voltage equilibrium point and determines the output voltage value through multiple feedback loops, ensuring a sufficiently fast transient response and thus outputting a stable voltage.

[0025] Reference Figure 1 The present invention provides a multi-cross-coupled feedback low-dropout voltage regulator circuit, comprising a level-flipping follower circuit, a multi-cross-coupled feedback loop, and an auxiliary voltage regulator circuit, wherein the level-flipping follower circuit, the multi-cross-coupled feedback loop, and the auxiliary voltage regulator circuit are connected in sequence:

[0026] The level-flip follower circuit includes a first-stage loop and a second-stage loop, inputting the compared voltage signal into the first-stage loop, converting the compared voltage signal into a current signal, and inputting the current signal into the second-stage loop, scaling the current signal, and charging and discharging the parasitic capacitance in the first-stage loop through the processed current signal, and outputting a final output voltage;

[0027] Specifically, the level-flip follower circuit further includes a power tube Mp, a power tube M1A, a power tube M3B, a power tube M5A, a power tube M6A, a power tube M7, a power tube M8, a power tube M9, a power tube M10, and a power tube M11, wherein the power tube M1A, the power tube M6A, the power tube M7, and the power tube M8 are P power tubes MOS tubes, the power tube M3B, the power tube M5A, the power tube M9, the power tube M10, and the power tube M11 are N power tubes MOS tubes, and the power tube Mp, the power tube M1A, the power tube M3B, the power tube M5A, and the power tube M6A form a first-stage circuit. The power tube M7, the power tube M8, the power tube M9, the power tube M10 and the power tube M11 form a second-stage loop; in the second-stage loop of the level-flip follower circuit, a proportional current mirror is constructed based on the power tube M9, the power tube M10 and the power tube M11 to perform scaling processing on the current signal; in the level-flip follower circuit, the source of the power tube M1A is respectively connected to the drain of the power tube Mp, the source of the power tube M2C in the multi-cross-coupling feedback loop and the source of the power tube M2B in the multi-cross-coupling feedback loop, and the drain of the power tube M1A is respectively connected to the drain of the power tube M3B and the source of the power tube M5A. The gate of the power tube M1A is connected to the gate of the power tube M1B in the multi-cross-coupled feedback loop and the gate and drain of the power tube M1C in the multi-cross-coupled feedback loop respectively. The source of the power tube M3B is grounded. The gate of the power tube M3B is connected to the resistor R1 in the multi-cross-coupled feedback loop and the drain of the power tube M2B in the multi-cross-coupled feedback loop respectively. The gate of the power tube M5A is connected to the reference voltage Vref. The drain of the power tube M5A is connected to the gate of the power tube M8 and the drain of the power tube M6A respectively. The source of the power tube M6A is connected to VIN. The gate of the power tube M6A is connected to VIN. The electrodes are respectively connected to the gate of the power tube M7, the gate and the drain of the power tube M6B in the auxiliary voltage regulator circuit, the source of the power tube M7 is connected to VIN, the drain of the power tube M7 is respectively connected to the drain of the power tube M11 and the gate of the power tube Mp, the source of the power tube M8 is connected to VIN, the drain of the power tube M8 is respectively connected to the drain of the power tube M9, the gate of the power tube M10 and the gate of the power tube M11, the gate of the power tube M9 is connected to the bias voltage VB1, the source of the power tube M9 is connected to the drain of the power tube M10, and the source of the power tube M10 and the source of the power tube M11 are grounded;

[0028] Furthermore, the power tube Mp, the power tube M1A, the power tube M3B, the power tube M5A, and the power tube M6A form a first-stage loop, and the power tube M7, the power tube M8, the power tube M9, the power tube M10, and the power tube M11 form a second-stage loop, wherein the power tubes M9, the power tube M10, and the power tube M11 form a proportional current mirror. When the Vout voltage changes, the signal is transmitted through the first-stage loop and finally from the drain of the power tube M5A to the power tube M8 at the input end of the second-stage loop. By converting the voltage into a current signal and then amplifying it by the proportional current mirror, the parasitic capacitance of the gate of the power tube Mp is charged and discharged, thereby changing the gate voltage of the power tube Mp, so that the Vout voltage is regulated and stabilized at the output operating voltage.

[0029] The multiple cross-coupled feedback loop is used to obtain a voltage change signal at the load end, amplify the voltage change signal to obtain an amplified voltage change signal, and transmit the amplified voltage change signal to the auxiliary voltage regulator circuit;

[0030] Specifically, the multi-cross-coupled feedback loop includes a power tube M1B, a power tube M1C, a power tube M2C, a power tube M2B, a power tube M3A, a power tube M4A, resistors R0 and R1, wherein the source of the power tube M1B is respectively connected to the source of the power tube M1C, the gate of the power tube M14 in the auxiliary regulator circuit, the source of the power tube M2A in the auxiliary regulator circuit, and the drain of the power tube Mbuff in the auxiliary regulator circuit; the gate of the power tube M1B is respectively connected to the gate of the power tube M1C, the drain of the power tube M1C, and the gate of the power tube M1A in the auxiliary regulator circuit; the drain of the power tube M1B is connected to the drain of the power tube M3A and the first resistor R0. One end is connected, the source of the power tube M2B is respectively connected to the source of the power tube M2C, the drain of the power tube Mp in the level flip follower circuit, and the source of the power tube M1A in the level flip follower circuit, the gate of the power tube M2B is respectively connected to the gate of the power tube M2C, the drain of the power tube M2C, and the gate of the power tube M2A in the auxiliary voltage regulator circuit, the drain of the power tube M2B is respectively connected to the drain of the power tube M4A and the first end of the resistor R1, the second end of the resistor R0 and the second end of the resistor R1 are respectively connected between the gate and drain of the power tube M3A and the gate and drain of the power tube M4A, and the gate of the power tube M3A is connected to the gate of the power tube M4A;

[0031] Furthermore, the function of the multi-cross-coupled feedback loop is to increase the voltage and current changes of each level follower and the auxiliary regulator, and to transmit the changes of the output Vout of the level follower to the output of the auxiliary regulator to achieve comparison with the reference voltage Vref, while also achieving a stabilizing effect on Vout. At the same time, the changes of Vout are also transmitted back to itself through the multi-cross-coupled feedback loop. These two functions enable Vout to stabilize to the specified operating voltage more quickly when it changes.

[0032] The auxiliary voltage regulator circuit includes a third-stage loop and a fourth-stage loop. The third-stage loop is a comparator. The fourth-stage loop is used to compare the amplified voltage change signal with the reference voltage signal and feed the compared voltage signal back to the level follower circuit through the auxiliary voltage regulator circuit.

[0033] Specifically, the auxiliary voltage regulator circuit also includes a power tube Mbuff, a power tube M12, a power tube M13, a power tube M14, a power tube M15, a power tube M16, a power tube M17, a power tube M2A, a power tube M4B, a power tube M5B, a power tube M6B and a resistor R3, wherein the power tube Mbuff, the power tube M12 and the power tube M13 are P power tube MOS tubes, the power tube M14, the power tube M15 and the power tube M16 are N power tube MOS tubes, the resistor R3, the power tube M12, the power tube M17, the power tube M2A, the power tube M4B, the power tube M5B, the power tube M6B and the resistor R3, The power tube M13, the power tube M14, the power tube M15, the power tube M16 and the power tube M17 form a third-level loop, and the power tube Mbuff, the power tube M2A, the power tube M4B, the power tube M5B and the power tube M6B form a fourth-level loop; in the third-level loop of the auxiliary voltage regulator circuit, a bias current source is constructed based on the power tube M16 and the power tube M17 and the resistor R3 to provide current to the third-level loop of the auxiliary voltage regulator circuit; in the auxiliary voltage regulator circuit, the drain of the power tube Mbuff is connected to the power The source of the power tube M2A is connected to the power supply VIN, the source of the power tube Mbuff is connected to the power supply VIN, the gate of the power tube Mbuff is respectively connected to the drain of the power tube M15 and the drain of the power tube M13, the source of the power tube M12 is connected to the power supply VIN, the gate of the power tube M12 is respectively connected to the drain of the power tube M12, the drain of the power tube M14 and the gate of the power tube M13, the source of the power tube M13 is connected to the power supply VIN, and the drain of the power tube M13 is respectively connected to the gate of the power tube Mbuff. The gate of the power tube M14 is connected to the drain of the power tube M15, the gate of the power tube M14 is respectively connected to the source of the power tube M1C in the multi-cross-coupled feedback loop and the source of the power tube M1B in the multi-cross-coupled feedback loop, the source of the power tube M14 is respectively connected to the drain of the power tube M16 and the source of the power tube M15, the gate of the power tube M15 is connected to the reference power supply Vref, the source of the power tube M16 is grounded, and the gate of the power tube M16 is respectively connected to the gate of the power tube M17 and the drain of the power tube M17;

[0034] Furthermore, the power transistor R3 and the power transistors M12 to M17 form a third-stage loop, wherein the power transistor R3, the power transistor M16, and the power transistor M17 form a simple bias current source for providing current to the third-stage loop of the auxiliary voltage regulator circuit. At the same time, the sum of the currents flowing through the power transistors M14 and M15 in the third-stage loop of the auxiliary voltage regulator circuit is constant. The power transistors Mbuff, M2A, M4B, M5B, and M6B form a fourth-stage loop, which mainly implements the function of comparing the output voltage of the fourth-stage loop (the drain of the power transistor Mbuff) with the reference voltage Vref, and then transmitting the comparison result back to the input of the fourth-stage loop (the gate of the power transistor Mbuff), thereby achieving stability between the output voltage and the input voltage of the auxiliary voltage regulator.

[0035] In summary, the working process of the circuit of the present invention is specifically as follows:

[0036] When the load decreases, the Vout voltage rises. The first-stage loop of the level-flipping follower transmits the Vout voltage change to the gate of the power tube M8 at the input end of the second-stage loop via the power tubes M1A and M5A, causing the current of the current mirror composed of the power tubes M9, M10, and M11 to decrease. At the same time, the Vout voltage change is transmitted to the gate of the power tube M5B of the auxiliary regulator through direct coupling, causing the current of the current mirror composed of the power tubes M6B, M7, and M6A to increase. As the current of the power tube M11 decreases, the current of the power tube M7 increases, charging the parasitic capacitance of the gate of the power tube MP, causing the gate voltage of the power tube MP to rise rapidly, thereby reducing the Vout voltage.

[0037] When the load increases, the Vout voltage drops. The first-stage loop of the level-flipping follower transmits the voltage change of Vout via the power tubes M1A and M5A to the gate of the power tube M8 at the input end of the second-stage loop, increasing the current of the current mirror composed of the power tubes M9, M10, and M11. At the same time, the change in the Vout voltage is transmitted to the gate of the power tube M5B of the auxiliary regulator through direct coupling, causing the current of the current mirror composed of the power tubes M6B, M7, and M6A to decrease. As the current of the power tube M11 increases and the current of the power tube M7 decreases, the parasitic capacitance of the gate of the power tube MP is discharged, causing the gate voltage of the power tube MP to drop rapidly to increase the Vout voltage.

[0038] The multi-cross-coupled feedback loop transmits the changes in Vout to the current source of the level-flipping follower and the auxiliary regulator, increasing the gain of each stage and reducing the time required for Vout to stabilize. For example, when Vout increases, it is transmitted to the power tube M2A of the auxiliary regulator via the power tube M2C, causing the source voltage of the power tube M5B to drop, further increasing the current of the current mirror of the power tubes M6B, power tube M7, and power tube M6A, increasing the gain of the first-stage loop and the second-stage loop of the level-flipping follower, and reducing the time required for Vout to stabilize.

[0039] On the other hand, a low dropout voltage regulator is provided, comprising a multi-cross-coupled feedback low dropout voltage regulator circuit as described in any possible design of the first aspect;

[0040] On the other hand, the working process, working details and technical effects of a multi-cross-coupled feedback low-dropout voltage regulator circuit in a low-dropout voltage regulator provided in this embodiment can be found in the circuit described in the first aspect or any possible design of the first aspect above, and will not be repeated here.

[0041] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multi-cross-coupled feedback low-dropout voltage regulator circuit, characterized in that: The device comprises a level-flipping follower circuit, a multi-cross-coupled feedback loop and an auxiliary voltage regulator circuit, wherein the level-flipping follower circuit, the multi-cross-coupled feedback loop and the auxiliary voltage regulator circuit are connected in sequence: The level-flip follower circuit includes a first-stage loop and a second-stage loop; The compared voltage signal is input to the first-stage loop, the first-stage loop converts the compared voltage signal into a current signal, and the current signal is input to the second-stage loop; The second-stage loop scales the current signal and charges and discharges the parasitic capacitance in the first-stage loop through the processed current signal to output a final output voltage. The multi-cross-coupled feedback loop is used to obtain a voltage change signal at the load end, amplify the voltage change signal to obtain an amplified voltage change signal, and transmit the amplified voltage change signal to the auxiliary voltage regulator circuit; The auxiliary voltage regulator circuit includes a third-level loop and a fourth-level loop; The third-level loop is a comparator; The fourth-stage loop is used to compare the amplified voltage change signal with the reference voltage signal, and feed the compared voltage signal back to the level-flip follower circuit through the auxiliary voltage regulator circuit; The multi-cross-coupled feedback loop includes a power tube M1B, a power tube M1C, a power tube M2C, a power tube M2B, a power tube M3A, a power tube M4A, resistors R0 and R1, the drain of the power tube M1B is connected to the drain of the power tube M3A and the first end of the resistor R0, the source of the power tube M2B is respectively connected to the source of the power tube M2C, the drain of the power tube Mp in the level-flip follower circuit, and the source of the power tube M1A in the level-flip follower circuit. The gate of the power tube M2B is respectively connected to the gate of the power tube M2C, the drain of the power tube M2C, and the gate of the power tube M2A in the auxiliary regulator circuit. The drain of the power tube M2B is respectively connected to the drain of the power tube M4A and the first end of the resistor R1. The second end of the resistor R0 and the second end of the resistor R1 are respectively connected between the gate and drain of the power tube M3A and the gate and drain of the power tube M4A. The gate of the power tube M3A is connected to the gate of the power tube M4A.

2. The multi-cross-coupled feedback low-dropout voltage regulator circuit according to claim 1, characterized in that: The first-stage loop and the second-stage loop include a power tube Mp, a power tube M1A, a power tube M3B, a power tube M5A, a power tube M6A, a power tube M7, a power tube M8, a power tube M9, a power tube M10, and a power tube M11, wherein the power tube Mp, the power tube M1A, the power tube M3B, the power tube M5A, and the power tube M6A constitute a first-stage loop, and the power tube M7, the power tube M8, the power tube M9, the power tube M10, and the power tube M11 constitute a second-stage loop.

3. The multi-cross-coupled feedback low-dropout voltage regulator circuit according to claim 2, characterized in that: In the second-stage loop of the level-flip follower circuit, a proportional current mirror is constructed based on the power tubes M9, M10, and M11 to perform scaling processing on the current signal.

4. The multi-cross-coupled feedback low-dropout voltage stabilizing circuit according to claim 3, characterized in that: In the level-flip follower circuit, the source of the power tube M1A is respectively connected to the drain of the power tube Mp and the multi-cross-coupled feedback loop; the drain of the power tube M1A is respectively connected to the drain of the power tube M3B and the source of the power tube M5A; the gate of the power tube M1A is connected to the multi-cross-coupled feedback loop; the source of the power tube M3B is grounded; the gate of the power tube M3B is connected to the multi-cross-coupled feedback loop; the gate of the power tube M5A is connected to the reference voltage Vref; the drain of the power tube M5A is respectively connected to the gate of the power tube M8 and the drain of the power tube M6A; the source of the power tube M6A is connected to VIN; The gate of the power tube M6A is respectively connected to the gate of the power tube M7 and the gate and drain of the power tube M6B in the auxiliary regulator circuit. The source of the power tube M7 is connected to VIN. The drain of the power tube M7 is respectively connected to the drain of the power tube M11 and the gate of the power tube Mp. The source of the power tube M8 is connected to VIN. The drain of the power tube M8 is respectively connected to the drain of the power tube M9, the gate of the power tube M10 and the gate of the power tube M11. The gate of the power tube M9 is connected to the bias voltage VB1. The source of the power tube M9 is connected to the drain of the power tube M10. The source of the power tube M10 and the source of the power tube M11 are grounded.

5. The multi-cross-coupled feedback low-dropout voltage regulator circuit according to claim 1, characterized in that: The source of the power tube M1A in the level-flip follower circuit is respectively connected to the drain of the power tube Mp, the source of the power tube M2C, and the source of the power tube M2B. The gate of the power tube M1A in the level-flip follower circuit is respectively connected to the gate of the power tube M1B, the gate and drain of the power tube M1C. The gate of the power tube M3B in the level-flip follower circuit is respectively connected to the resistor R1 and the drain of the power tube M2B. The source of the power tube M1B is respectively connected to the source of the power tube M1C, the gate of the power tube M14 in the auxiliary voltage regulator circuit, the source of the power tube M2A in the auxiliary voltage regulator circuit, and the drain of the power tube Mbuff in the auxiliary voltage regulator circuit. The gate of the power tube M1B is respectively connected to the gate of the power tube M1C, the drain of the power tube M1C, and the gate of the power tube M1A in the auxiliary voltage regulator circuit.

6. The multi-cross-coupled feedback low-dropout voltage regulator circuit according to claim 1, characterized in that: The third-level loop and the fourth-level loop include power tube Mbuff, power tube M12, power tube M13, power tube M14, power tube M15, power tube M16, power tube M17, power tube M2A, power tube M4B, power tube M5B, power tube M6B and resistor R3, wherein the resistor R3, power tube M12, power tube M13, power tube M14, power tube M15, power tube M16 and power tube M17 constitute the third-level loop, and the power tube Mbuff, power tube M2A, power tube M4B, power tube M5B and power tube M6B constitute the fourth-level loop.

7. The multi-cross-coupled feedback low-dropout voltage regulator circuit according to claim 6, characterized in that: In the third loop of the auxiliary voltage regulator circuit, a bias current source is constructed based on the power tube M16, the power tube M17 and the resistor R3 to provide current to the third loop of the auxiliary voltage regulator circuit, while making the sum of the currents flowing through the power tube M14 and the power tube M15 in the third loop of the auxiliary voltage regulator circuit constant.

8. The multi-cross-coupled feedback low-dropout voltage stabilizing circuit according to claim 7, characterized in that: In the auxiliary voltage regulator circuit, the drain of the power tube Mbuff is connected to the source of the power tube M2A, the source of the power tube Mbuff is connected to the power supply VIN, the gate of the power tube Mbuff is respectively connected to the drain of the power tube M15 and the drain of the power tube M13, the source of the power tube M12 is connected to the power supply VIN, the gate of the power tube M12 is respectively connected to the drain of the power tube M12, the drain of the power tube M14 and the gate of the power tube M13, the source of the power tube M13 is connected to the power supply VIN, and the gate of the power tube M13 is respectively connected to the drain of the power tube M12, the drain of the power tube M14 and the gate of the power tube M13. The drain is respectively connected to the gate of the power tube Mbuff and the drain of the power tube M15, the gate of the power tube M14 is respectively connected to the source of the power tube M1C in the multi-cross-coupling feedback loop and the source of the power tube M1B in the multi-cross-coupling feedback loop, the source of the power tube M14 is respectively connected to the drain of the power tube M16 and the source of the power tube M15, the gate of the power tube M15 is connected to the reference power supply Vref, the source of the power tube M16 is grounded, and the gate of the power tube M16 is respectively connected to the gate of the power tube M17 and the drain of the power tube M17.

9. A low dropout voltage regulator, characterized in that: It comprises a multi-cross-coupled feedback low-dropout voltage regulator circuit as described in any one of claims 1-8.

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