A power management circuit and a power management chip

Abstract

The application discloses a power management circuit and a power management chip, wherein the power management circuit comprises a master control module, an enabling control end, the master control module receives a switch control signal through the enabling control end, and the switch control signal is used for controlling the master control module to be turned on or turned off; a first voltage reduction module is connected with a first voltage reduction output end of the master control module and is used for outputting a first voltage reduction voltage after the master control module is turned on; and a second voltage reduction module is connected with a second voltage reduction output end of the master control module and is used for outputting a second voltage reduction voltage after the master control module is turned on. In the application, the peripheral circuit structure of the chip can be effectively simplified.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a power management circuit and a power management chip. Background Technology

[0002] Power management integrated chips are mainly used to power the display panel, providing gamma voltage and common voltage. Current power management integrated chips incorporate multiple buck circuits, requiring multiple corresponding ports; furthermore, the switching state control of the power management integrated chip also requires switching circuits, making the peripheral circuit structure of the power management integrated chip complex.

[0003] Therefore, existing technologies still need to be improved and enhanced. Summary of the Invention

[0004] The purpose of this application is to provide a power management circuit and a power management chip that can effectively simplify the peripheral circuit structure of the chip.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] This application provides a power management circuit, including:

[0007] The main control module includes an enable control terminal. The main control module receives a switch control signal through the enable control terminal. The switch control signal is used to control the main control module to turn on or off.

[0008] The first step-down module is connected to the first step-down output terminal of the main control module and is used to output the first step-down voltage after the main control module is turned on.

[0009] The second step-down module is connected to the second step-down output terminal of the main control module and is used to output the second step-down voltage after the main control module is turned on.

[0010] In some embodiments of the power management circuit, the main control module further includes:

[0011] At least one gamma voltage output terminal is provided for outputting the display drive voltage;

[0012] Each gamma voltage output terminal is connected in series with a first resistor, and each first resistor is integrated into the main control module.

[0013] In some embodiments of the power management circuit, the power management circuit further includes:

[0014] The gamma output module, connected to each gamma voltage output terminal, is used to filter the display drive voltage.

[0015] In some embodiments of the power management circuit, the power management circuit further includes:

[0016] At least one common voltage output module is provided, and each common voltage output module is connected to the common voltage output terminal of the main control module to filter the common voltage output from the corresponding common voltage output terminal.

[0017] In some embodiments of the power management circuit, the power management circuit further includes:

[0018] The first boost module is connected to the first negative voltage output terminal of the main control module and is used to output the working voltage after the main control module is started.

[0019] The second boost module is connected to the second negative voltage output terminal of the main control module and is used to output the turn-on voltage after the main control module is started.

[0020] The step-up / step-down module is connected to the third negative voltage output terminal of the main control module and is used to output a shutdown voltage after the main control module starts up.

[0021] In some embodiments of the power management circuit, the first step-down module includes a first inductor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a third resistor, and a fourth resistor.

[0022] One end of the first inductor and one end of the second resistor are both connected to the first step-down output terminal of the main control module. The other end of the second resistor is grounded through the first capacitor. The other end of the first inductor is connected to the first step-down voltage output terminal through the fourth resistor. One end of the second capacitor, one end of the third capacitor, one end of the fourth capacitor, one end of the fifth capacitor, and one end of the third resistor are all connected to the other end of the first inductor. The other ends of the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the third resistor are all grounded.

[0023] In some embodiments of the power management circuit, the second step-down module includes a second inductor, a fifth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a sixth resistor, and a seventh resistor.

[0024] One end of the second inductor and one end of the fifth resistor are both connected to the first step-down output terminal of the main control module. The other end of the fifth resistor is grounded through the sixth capacitor. The other end of the second inductor is connected to the second step-down voltage output terminal through the seventh resistor. One end of the seventh capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the tenth capacitor, and one end of the sixth resistor are all connected to the other end of the second inductor. The other ends of the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor, and the sixth resistor are all grounded.

[0025] In some embodiments of the power management circuit, the gamma output module includes the same number of filter capacitors as the gamma voltage output terminals, with each filter capacitor connected in parallel with the corresponding gamma voltage output terminal.

[0026] In some embodiments of the power management circuit, each common voltage output module includes an eighth resistor, a ninth resistor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor.

[0027] One end of the eighth resistor is connected to the corresponding common voltage output terminal of the main control module. The other end of the eighth resistor and one end of the ninth resistor are both connected to the voltage output terminal. One end of the eleventh capacitor, one end of the twelfth capacitor, and one end of the thirteenth capacitor are all connected to the other end of the eighth resistor. The other ends of the eleventh capacitor, the twelfth capacitor, and the thirteenth capacitor are all grounded.

[0028] This application also provides a power management chip, including the power management circuit described above.

[0029] Compared to existing technologies, the power management circuit provided in this application eliminates the need for a switching power supply by setting an enable control terminal that receives a switch control signal to turn the power management circuit on or off. At the same time, the power management circuit in this application only has two step-down voltages, which means only two step-down output terminals are needed, reducing the number of step-down modules and simplifying the peripheral circuit structure of the chip. Attached Figure Description

[0030] Figure 1 This is a first structural block diagram of the power management chip provided in this application.

[0031] Figure 2 This is a second structural block diagram of the power management chip provided in this application.

[0032] Figure 3 This is a third structural block diagram of the power management chip provided in this application.

[0033] Figure 4 This is a fourth structural block diagram of the power management chip provided in this application.

[0034] Figure 5 This is a pin diagram of the main control module in the power management chip provided in this application.

[0035] Figure 6 The circuit diagram of the first buck module in the power management chip provided in this application.

[0036] Figure 7 The circuit diagram of the second buck module in the power management chip provided in this application.

[0037] Figure 8 The circuit diagram of the gamma voltage output module in the power management chip provided in this application.

[0038] Figure 9 The circuit diagram of the common voltage output module in the power management chip provided in this application.

[0039] Figure 10 The circuit diagram of the buck-boost module in the power management chip provided in this application.

[0040] Figure 11 The circuit diagram of the first boost module in the power management chip provided in this application.

[0041] Figure 12 The circuit diagram of the second boost module in the power management chip provided in this application. Detailed Implementation

[0042] The purpose of this application is to provide a power management circuit that can effectively simplify the external circuit structure.

[0043] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description of this application is provided with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0044] Please see Figure 1 This application provides a power management chip, including a power management circuit. The power management circuit includes a main control module 100, which includes an enable control terminal. The main control module 100 is used to receive a switch control signal through the enable control terminal (EN terminal in this embodiment). The switch control signal is used to control the main control module 100 to turn on or off. A first step-down module 200 is connected to the first step-down output terminal (LX_H terminal in this embodiment) of the main control module 100 and is used to output a first step-down voltage after the main control module 100 is turned on. A second step-down module 300 is connected to the second step-down output terminal (LX1 terminal in this embodiment) of the main control module 100 and is used to output a second step-down voltage after the main control module 100 is turned on. The switch control signal in this embodiment is PANEL_ON / OFF. The main control module is the main body of the power management chip, while the first and second buck modules are the peripheral circuits of the chip. The power management circuit in this application sets an enable control terminal, which receives a switch control signal and controls the main control module to turn on or off, thereby controlling the power management circuit to turn on or off, thus eliminating the need for a switching power supply. At the same time, the power management circuit in this application only has two buck voltages, which means only two buck output terminals are needed, reducing the number of buck modules and simplifying the peripheral circuit structure of the chip.

[0045] In some embodiments, the main control module 100 of this application further includes at least one gamma voltage output terminal for outputting display driving voltage; each gamma voltage output terminal is connected in series with a first resistor, and each first resistor is integrated into the main control module 100; specifically, the main control module 100 in this embodiment includes 14 gamma voltage output terminals, each pin corresponding to a first resistor connected in series, the first resistor serving as a voltage divider resistor, and the display driving voltage output through the gamma voltage output terminal after passing through the voltage divider resistor can be GMA1, GMA2, GMA3, ..., GMA14 respectively; the power management circuit in this application can effectively reduce the peripheral circuit structure of the main control module 100 by integrating the first resistor into the main control module 100, thereby simplifying the structure of the power management circuit.

[0046] Please see Figure 2 In some embodiments, the power management circuit of this application further includes a gamma voltage output module 400, which is connected to each gamma voltage output terminal and used to filter the display driving voltage. In this embodiment, 14 gamma voltage output terminals are provided, and correspondingly, after filtering by the gamma voltage output module 400, 14 display driving voltages are output, namely GM1, GM2, GM3, ..., GM14. By using the gamma voltage output module 400 to filter the display driving voltage in this application, the stability and reliability of the display driving voltage can be effectively ensured.

[0047] Please see Figure 3 In some embodiments, the power management circuit further includes at least one common voltage output module 500, each common voltage output module 500 being connected to a corresponding common voltage output terminal of the main control module 100, used to filter the common voltage output from the corresponding common voltage output terminal. Specifically, in this embodiment, the main control module 100 is provided with three common voltage output terminals, the common voltages output by the three common voltage output terminals being VCM1, VCM2, and VCM3, respectively. The common voltages obtained after filtering by the common voltage output modules 500 are CFVCM, SVCM, and AVCM, respectively.

[0048] Please see Figure 4In some embodiments, the power management circuit further includes a first boost module 600 connected to the first negative voltage output terminal of the main control module 100, used to output a working voltage after the main control module 100 is started; a second boost module 700 connected to the second negative voltage output terminal of the main control module 100, used to output an on-state voltage after the main control module 100 is started; and a buck-boost module 800 connected to the third negative voltage output terminal of the main control module 100, used to output a off-state voltage after the main control module 100 is started. The on-state voltage is VGH_F, the working voltage is VAA, and the off-state voltage is VGL_F. The main control module 100 in this application is equipped with three power conversion modules. After the main control module 100 is working, the first negative voltage output terminal, the second negative voltage output terminal, and the third negative voltage output terminal of the main control module 100 output three negative voltages respectively (VAA_G terminal, VGH_LX terminal, and VGL_LX terminal) to provide the required voltage to the display screen.

[0049] Please see Figure 5 In some embodiments, the main control module 100 of this application further includes ten clock signal output terminals and two discharge output terminals; wherein, the ten clock signal output terminals correspond to pins 22 to 26 and pins 28 to 32 respectively, and the two discharge output terminals correspond to pins 35 and 36 respectively. The ten clock signal output terminals are used to output the corresponding clock signals, i.e., CK signals, and the discharge output terminals are used to output the corresponding LS signals. The power management circuit of this application is used to provide the display screen with various required electrical energy, as well as CK and LS signals. The LS signal can be used to control the pixel circuit in the display screen to release charge. The number of CK signals and LS signals required for different screen models are different. For example, some displays require one LS signal, while others require two LS signals. This application sets two LS signal outputs and ten CK signal outputs to ensure that different display models are met, so as to achieve effective matching with a variety of different display models, thereby improving the compatibility of the power management circuit.

[0050] Please see Figure 6In one embodiment, the first step-down module 200 includes a first inductor L1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a third resistor R3, and a fourth resistor R4. One end of the first inductor L1 and one end of the second resistor R2 are both connected to the first step-down output terminal of the main control module 100. The other end of the second resistor R2 is grounded through the first capacitor C1. The other end of the first inductor L1 is connected to the first step-down voltage output terminal through the fourth resistor R4. One end of the second capacitor C2, one end of the third capacitor C3, one end of the fourth capacitor C4, one end of the fifth capacitor C5, and one end of the third resistor R3 are all connected to the other end of the first inductor L1. The other ends of the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the third resistor R3 are all grounded. The enable control terminal of the main control module 100 corresponds to pin 12, and the switch control signal received by the enable pin is PANEL_ON / OFF. The first step-down voltage output terminal of the main control module 100 corresponds to pin 61. In this embodiment, the first step-down voltage output by the first step-down module 200 is HVAA or VDD3V3.

[0051] Please see Figure 7 In one embodiment, the second step-down module 300 includes a second inductor L2, a fifth resistor R5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a sixth resistor R6, and a seventh resistor R7. One end of the second inductor L2 and one end of the fifth resistor R5 are both connected to the first step-down output terminal of the main control module 100. The other end of the fifth resistor R5 is grounded through the sixth capacitor C6. The other end of the second inductor L2 is connected to the second step-down voltage output terminal through the seventh resistor R7. One end of the seventh capacitor C7, one end of the eighth capacitor C8, one end of the ninth capacitor C9, one end of the tenth capacitor C10, and one end of the sixth resistor R6 are all connected to the other end of the second inductor L2. The other ends of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, and the sixth resistor R6 are all grounded. In this embodiment, the second step-down output terminal of the main control module 100 corresponds to pin 69, and the first step-down voltage is VDD3V3 or VDD1V8.

[0052] This application reduces the number of step-down modules by setting only two: one for output voltage HVAA or VDD3V3 and the other for output voltage VDD3V3 or VDD1V8. This also reduces the number of ports used in the main control module 100, thereby effectively reducing the external circuit structure of the main control module 100 and simplifying the power management circuit structure.

[0053] Please see Figure 8As one embodiment, the gamma voltage output module 400 includes a number of filter capacitors equal to the number of gamma voltage output terminals, with each filter capacitor connected in parallel to its corresponding gamma voltage output terminal. In this embodiment, 14 gamma voltage output terminals are provided, along with 14 corresponding filter capacitors. Each gamma voltage output terminal has one filter capacitor connected in parallel. These filter capacitors filter the display driving voltage output from the gamma voltage output port of the main control module 100. The filtered display driving voltages are designated as GM1, GM2, GM3, ..., GM14. By providing a filter capacitor at each gamma voltage output terminal, the stability and reliability of the display driving voltage can be ensured in this application.

[0054] Please see Figure 9 As one embodiment, each common voltage output module 500 includes an eighth resistor R8, a ninth resistor R9, an eleventh capacitor C11, a twelfth capacitor C12, and a thirteenth capacitor C13; one end of the eighth resistor R8 is connected to the corresponding common voltage output terminal of the main control module 100, and the other end of the eighth resistor R8 and one end of the ninth resistor R9 are both connected to the voltage output terminal; one end of the eleventh capacitor C11, one end of the twelfth capacitor C12, and one end of the thirteenth capacitor C13 are all connected to the other end of the eighth resistor R8; and the other ends of the eleventh capacitor C11, the twelfth capacitor C12, and the thirteenth capacitor C13 are all grounded. In this embodiment, three common voltage output modules 500 are provided, and the three common voltages output by the three common voltage output modules 500 are CFVCM, SVCM and AVCM respectively; wherein, the three common output modules are respectively connected to pins 41, 42 and 44 of the main control module 100; in this application, the three common voltages are output by the three common voltage output modules 500 of the main control module 100, which can provide a common level status on the display screen.

[0055] Please see Figure 10In one embodiment, the buck-boost module 800 includes a third inductor L3, a tenth resistor R10, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eleventh resistor R11, and a first diode D1. One end of the third inductor L3 and one end of the tenth resistor R10 are both connected to the cathode of the first diode D1. The cathode of the first diode D1 is connected to the third negative voltage output terminal of the main control module 100 (VGL_LX terminal in this embodiment, i.e., pin 4 in the main control module 100). The other end of the third inductor L3 is grounded, and the positive terminal of the first diode D1 is... The first negative voltage output terminal is connected to the voltage output terminal. One end of the fifteenth capacitor C15, one end of the sixteenth capacitor C16, one end of the seventeenth capacitor C17, and one end of the eleventh resistor R11 are all connected to the positive terminal of the first diode D1. The other ends of the fifteenth capacitor C15, the sixteenth capacitor C16, the seventeenth capacitor C17, and the eleventh resistor R11 are all grounded. In this embodiment, the first negative voltage output terminal corresponds to pin 65 of the main control module 100, the second negative voltage output terminal corresponds to pin 39 of the main control module 100, and the third negative voltage output terminal corresponds to pin 4 of the main control module 100.

[0056] Please see Figure 11As one embodiment, the first boost module 600 includes a fourth inductor L4, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a first switch Q1, a second switch Q2, and a second diode D2; the eighteenth capacitor... One end of capacitor C18, one end of the nineteenth capacitor C19, one end of the twenty-fourth capacitor C24, and the source of the first switching transistor Q1 are all energized. The other ends of the eighteenth capacitor C18 and the nineteenth capacitor C19 are both grounded. The gate of the first switching transistor Q1 is connected to pin 12 of the main control module 100 through the eighteenth resistor R18. The other end of the twenty-fourth capacitor C24 and one end of the twenty-fifth capacitor C25 are both connected to the gate of the first switching transistor Q1. The other end of the twenty-fifth capacitor C25 is connected to the drain of the first switching transistor Q1. The drain of the first switching transistor Q1 is connected to one end of the fourth inductor L4. One end of the twenty-sixth capacitor C26 and one end of the twenty-seventh capacitor C27 are both connected to one end of the fourth inductor L4. The other end of capacitor C26 (sixteenth capacitor) and capacitor C27 (twentieth capacitor) are both grounded. The other end of inductor L4, the source of the second switch Q2, and one end of resistor R19 are all connected to the anode of diode D2. The other end of resistor R19 is grounded through capacitor C29. The gate of the second switch Q2 is connected to the first negative voltage output terminal (VAA_G terminal, i.e., pin 65 of the main control module 100) of the main control module 100 through resistor R17. The drain of the second switch Q2 is connected to one end of resistor R15 and one end of resistor R16. The other ends of resistor R15, R16, and R14 are all grounded. The circuit is grounded. The other end of the fourteenth resistor R14 is connected to the gate of the second switch Q2. The cathode of the second diode D2 is connected to the voltage output terminal (VAA terminal in this embodiment) through the thirteenth resistor R13. One end of the twentieth capacitor C20, one end of the twenty-first capacitor C21, one end of the twenty-second capacitor C22, one end of the twenty-third capacitor C23, one end of the twenty-eighth capacitor C28, and one end of the twelfth resistor R12 are all connected to the cathode of the second diode D2. The other ends of the twentieth capacitor C20, the twenty-first capacitor C21, the twenty-second capacitor C22, the twenty-third capacitor C23, the twenty-eighth capacitor C28, and the twelfth resistor R12 are all grounded.

[0057] Please see Figure 12 In one embodiment, the second boost module 700 includes a twenty-ninth capacitor C29, a thirtieth capacitor C30, a fifth inductor L5, a twenty-first resistor R21, a thirty-first capacitor C31, a thirty-second capacitor C32, a thirty-third capacitor C33, a thirty-fourth capacitor C34, a thirty-fifth capacitor C35, and a third diode D3. One end of the twenty-ninth capacitor C29, one end of the thirtieth capacitor C30, and one end of the fifth inductor L5 are all energized. The other end of the fifth inductor L5 and one end of the second thirtieth resistor R21 are both connected to the positive terminal of the third diode D3. The other end of the second thirtieth resistor R21 is grounded through the thirty-fifth capacitor C35. The negative terminal of the third diode D3 is connected to the turn-on voltage output terminal (VGH_F voltage output terminal in this embodiment), and the positive terminal of the third diode D3 is also connected to the second negative voltage output terminal (VGH_LX terminal, i.e., pin 39 of the main control module 100 in this embodiment). One end of the thirty-first capacitor C31 and one end of the thirty-second capacitor C32 are energized. One end of the 33rd capacitor C33, one end of the 34th capacitor C34, and one end of the 20th resistor R20 are all connected to the negative terminal of the third diode D3. The other ends of the 31st capacitor C31, the 32nd capacitor C32, the 33rd capacitor C33, the 34th capacitor C34, and the 20th resistor R20 are all grounded. The main control module 100 in this application is equipped with three power conversion modules, namely the step-up / step-down module 800, the first step-up module 600, and the second step-up module 700. After the main control module 100 is working, the first negative voltage output terminal, the second negative voltage output terminal, and the third negative voltage output terminal of the main control module 100 output three negative voltages, namely the VAA_G terminal, the VGH_LX terminal, and the VGL_LX terminal, respectively. After voltage conversion by the first step-up module 600, the second step-up module 700, and the step-up / step-down module 800, the working voltage VAA, the turn-on voltage VGH_F, and the turn-off voltage VGL_F are output.

[0058] Furthermore, this application also provides a power management circuit, which will not be described in detail here as the power management circuit has been described in detail above.

[0059] In summary, this application provides a power management circuit and a power management chip. The power management circuit includes a main control module with an enable control terminal. The main control module receives a switch control signal through the enable control terminal, which is used to control the main control module to turn on or off. A first buck module is connected to the first buck output terminal of the main control module and is used to output a first buck voltage after the main control module is turned on. A second buck module is connected to the second buck output terminal of the main control module and is used to output a second buck voltage after the main control module is turned on. This application can effectively simplify the peripheral circuit structure of the main control module, thereby simplifying the structure of the power management chip.

[0060] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of this application, and all such substitutions or changes should fall within the protection scope of the appended claims.

Claims

1. A power management circuit, characterized in that, include: The main control module includes an enable control terminal, through which the main control module receives a switch control signal, which is used to control the main control module to turn on or off. The first step-down module is connected to the first step-down output terminal of the main control module and is used to output the first step-down voltage after the main control module is turned on. The second step-down module is connected to the second step-down output terminal of the main control module and is used to output a second step-down voltage after the main control module is turned on. The first step-down module includes a first inductor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a third resistor, and a fourth resistor; One end of the first inductor and one end of the second resistor are both connected to the first step-down output terminal of the main control module. The other end of the second resistor is grounded through the first capacitor. The other end of the first inductor is connected to the first step-down voltage output terminal through the fourth resistor. One end of the second capacitor, one end of the third capacitor, one end of the fourth capacitor, one end of the fifth capacitor, and one end of the third resistor are all connected to the other end of the first inductor. The other ends of the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the third resistor are all grounded.

2. The power management circuit according to claim 1, characterized in that, The main control module also includes: At least one gamma voltage output terminal is provided for outputting the display drive voltage; Each of the gamma voltage output terminals is connected in series with a first resistor, and each of the first resistors is integrated into the main control module.

3. The power management circuit according to claim 2, characterized in that, The power management circuit also includes: A gamma output module, connected to each of the gamma voltage output terminals, is used to filter the display drive voltage.

4. The power management circuit according to claim 3, characterized in that, The power management circuit also includes: At least one common voltage output module, each of which is connected to the common voltage output terminal of the main control module, for filtering the common voltage output from the corresponding common voltage output terminal.

5. The power management circuit according to claim 4, characterized in that, The power management circuit also includes: The first boost module is connected to the first negative voltage output terminal of the main control module and is used to output the working voltage after the main control module is started. The second boost module is connected to the second negative voltage output terminal of the main control module and is used to output the turn-on voltage after the main control module is started. A boost / buck module is connected to the third negative voltage output terminal of the main control module and is used to output a shutdown voltage after the main control module is started.

6. The power management circuit according to claim 1, characterized in that, The second step-down module includes a second inductor, a fifth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a sixth resistor, and a seventh resistor; One end of the second inductor and one end of the fifth resistor are both connected to the second step-down output terminal of the main control module. The other end of the fifth resistor is grounded through the sixth capacitor. The other end of the second inductor is connected to the second step-down voltage output terminal through the seventh resistor. One end of the seventh capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the tenth capacitor, and one end of the sixth resistor are all connected to the other end of the second inductor. The other ends of the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor, and the sixth resistor are all grounded.

7. The power management circuit according to claim 3, characterized in that, The gamma output module includes the same number of filter capacitors as the gamma voltage output terminals, and each filter capacitor is connected in parallel with the corresponding gamma voltage output terminal.

8. The power management circuit according to claim 4, characterized in that, Each of the aforementioned common voltage output modules includes an eighth resistor, a ninth resistor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor; One end of the eighth resistor is connected to the corresponding common voltage output terminal of the main control module. The other end of the eighth resistor and one end of the ninth resistor are both connected to the voltage output terminal. One end of the eleventh capacitor, one end of the twelfth capacitor, and one end of the thirteenth capacitor are all connected to the other end of the eighth resistor. The other ends of the eleventh capacitor, the twelfth capacitor, the thirteenth capacitor, and the ninth resistor are all grounded.

9. A power management chip, characterized in that, Includes the power management circuit as described in any one of claims 1-8.

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