Charge pump circuit and power supply chip
Through the time-division multiplexed charge pump circuit, the combination of the main control switch, the charge pump main module, the voltage feedback module, the timing control module and the switched capacitor module solves the problem of the large area and power consumption when the charge pump generates multiple voltages in the existing technology. It solves the problem of high power consumption and realizes efficient and low-power multi-voltage generation.
Patent Information
- Application Number
- CN202411235780.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-01-24
AI Technical Summary
In the prior art, the circuit architecture that generates multiple voltages through a charge pump occupies a large area and consumes a high power consumption.
The charge pump circuit with time -sharing replication is used to achieve the combination of the main control switch, the charge pump main module, the voltage feedback module, the timing control module, and the switch capacitor module to achieve time -sharing charging of multiple switching capacitors modules, generating multiple voltages to generate multiple voltages Essence
While generating multiple voltages, it reduces the area occupation and power consumption of the chip, achieving more efficient voltage generation.
Smart Images
Figure CN119362878A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of power electronics, and in particular relates to a charge pump circuit and a power supply chip. Background Art
[0002] In analog circuits, multiple stable DC voltages are usually required as reference voltages or as power supplies. If these voltages are lower than the power supply voltage but higher than the ground level, they can be generated by a low dropout regulator (LDO) circuit connected to the power supply and ground. If the required voltage is higher than the power supply voltage or lower than the ground level, a positive charge pump circuit is required to generate a positive voltage higher than the power supply voltage, or a negative charge pump circuit is used to generate a negative voltage lower than the ground level. It should be noted that the voltage generated by the charge pump circuit is not a stable voltage and will change with parameters such as the power supply voltage. In order to obtain a stable voltage, it is necessary to use a feedback circuit to control the charge pump operation or use an LDO with negative feedback.
[0003] The charge pump and feedback control circuit architecture is as follows Figure 1 As shown in the figure, the charge pump is responsible for charging, and the voltage feedback circuit determines whether the charging is completed by comparing the output voltage with the set voltage. If the output voltage reaches the set voltage, the charge pump clock is turned off and charging stops.
[0004] If multiple voltages need to be generated, a charge pump plus multiple LDOs are usually used, such as Figure 2 As shown, taking positive voltage as an example, the charge pump generates a higher voltage as the power supply for multiple LDOs, and then generates multiple required voltages through the LDOs.
[0005] The charge pump plus voltage feedback circuit architecture can generate a stable voltage. If multiple voltages are to be generated, multiple such circuits are required. The charge pump circuit generally uses on-chip capacitors to charge the external circuit, which has a relatively large area. Multiple charge pump circuits will occupy a considerable area, directly increasing the chip cost. Similarly, the charge pump plus LDO circuit architecture requires multiple LDO circuits. In addition to occupying area, the LDO circuit will also have static power consumption, which is not conducive to area and power consumption control. Summary of the invention
[0006] The purpose of the present invention is to provide a charge pump circuit and a power supply chip, which generate multiple voltages by time-sharing multiplexing, thereby solving the technical problem that the circuit architecture of generating multiple voltages by charge pump in the prior art occupies a large area and has high power consumption.
[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:
[0008] The present invention provides a charge pump circuit, comprising:
[0009] The first end of the main control switch is connected to the clock signal;
[0010] The input end of the charge pump main module is connected to the second end of the main control switch, and the output end is respectively connected to the input end of each of the switch capacitor modules;
[0011] The first end of the voltage feedback module is connected to the control end of the main control switch, and the second end is connected to the output end of each of the switch capacitor modules respectively;
[0012] The first end of the timing control module is connected to the third end of the voltage feedback module, and the second end is respectively connected to the control end of each corresponding switch capacitor module;
[0013] The timing control module is used to control the switching of the switch capacitor modules and the switching of the preset voltage of the voltage feedback module, so that the charge pump main module charges each switch capacitor module to the corresponding preset voltage.
[0014] In one embodiment of the present invention, the main control switch includes a triode or a MOSFET tube.
[0015] In one embodiment of the present invention, the voltage feedback module is used to control the on-off of the main control switch according to the output voltage of the switch capacitor module, thereby controlling the charge pump main module to charge the switch capacitor module;
[0016] When the charge pump main module charges one of the switch capacitor modules, the voltage feedback module samples the output voltage of the corresponding switch capacitor module in real time, and determines whether the output voltage reaches the preset voltage;
[0017] If yes, the voltage feedback module controls the main control switch to be turned off, so that the charge pump main module stops charging the switch capacitor module;
[0018] If not, the voltage feedback module controls the main control switch to close, so that the charge pump main module starts to charge the switch capacitor module.
[0019] In one embodiment of the present application, the switch capacitor module includes a switch unit and an output capacitor;
[0020] The first end of the switch unit is connected to the output end of the charge pump main module, the second end is connected to the second end of the voltage feedback module, the third end and the fourth end are connected to the first end of the output capacitor, and the control end is connected to the second end of the timing control module;
[0021] The second end of the output capacitor is grounded;
[0022] The timing control module is used to control the switch unit to realize the switching between the charge pump main module and the voltage feedback module and the corresponding output capacitor.
[0023] In one embodiment of the present invention, the output capacitor is arranged outside the chip and connected to the switch unit through a chip port.
[0024] In one embodiment of the present invention, the switch unit includes two MOSFET tubes connected in parallel.
[0025] In one embodiment of the present invention, the timing control module controls the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module according to a fixed timing, so that the charge pump main module charges the output capacitor of each switch capacitor module to the corresponding preset voltage.
[0026] In one embodiment of the present invention, the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module are controlled according to a fixed timing so that the charge pump main module charges the output capacitor of each switch capacitor module to the corresponding preset voltage, including:
[0027] When the output capacitor of one of the switch capacitor modules is charged to the corresponding preset voltage, determining whether the actual charging time of the output capacitor of the switch capacitor module reaches the preset charging time;
[0028] If yes, switch to the next switch capacitor module to charge the output capacitor of the switch capacitor module;
[0029] If not, the next switch capacitor module is not switched to, and the output voltage of the switch capacitor module is maintained at the corresponding preset voltage before the preset charging time is reached.
[0030] In one embodiment of the present invention, the timing control module controls the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module according to the seamless timing, so that the charge pump main module charges the output capacitor of each switch capacitor module to the corresponding preset voltage;
[0031] When the output capacitor of one of the switch capacitor modules is charged to a corresponding preset voltage, the next switch capacitor module is directly switched to charge the output capacitor of the switch capacitor module.
[0032] Based on the same inventive concept, the present invention also provides a power supply chip, comprising any of the charge pump circuits described above.
[0033] The present invention provides a charge pump circuit, including a main control switch, a charge pump main module, a voltage feedback module, a timing control module and at least two switch capacitor modules. The timing control module is used to control the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module, so that the charge pump main module charges each of the switch capacitor modules to the corresponding preset voltage. The charge pump circuit of the present invention uses a time-division multiplexing method to control the charge pump main module to charge each of the switch capacitor modules, and the output capacitor of the switch capacitor module is set outside the chip, so that a small area and low power consumption can be maintained while generating multiple voltages. Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.
[0035] Figure 1 The circuit structure diagram of the charge pump plus feedback control provided in the prior art.
[0036] Figure 2 The circuit architecture diagram of the charge pump plus LDO provided in the prior art.
[0037] Figure 3 A schematic diagram of the structure of a charge pump circuit provided by an exemplary embodiment of the present application.
[0038] Figure 4 A circuit diagram of a charge pump circuit provided by an exemplary embodiment of the present application.
[0039] Figure 5 An exemplary embodiment of the present application provides a charge pump circuit with a positive voltage charging timing and a voltage waveform at a fixed timing.
[0040] Figure 6 An exemplary embodiment of the present application provides a charge pump circuit with a positive voltage charging timing and a voltage waveform under a seamless timing.
[0041] Figure 7 An exemplary embodiment of the present application provides a charge pump circuit with a negative voltage charging timing and a voltage waveform at a fixed timing.
[0042] Figure 8An exemplary embodiment of the present application provides a charge pump circuit with a negative voltage charging timing and voltage waveform under a seamless timing.
[0043] The reference numerals are as follows:
[0044] 100 Master switch
[0045] 200 Charge Pump Main Module
[0046] 300 Voltage Feedback Module
[0047] 400 Timing Control Module
[0048] 500 Switched Capacitor Module
[0049] 501 Switching unit
[0050] 502 Output capacitor DETAILED DESCRIPTION
[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0052] In order to solve the technical problem that the circuit architecture of generating voltage by charge pump in the prior art occupies a large area and has high power consumption, the present invention provides a charge pump circuit, including a main control switch, a charge pump main module, a voltage feedback module, a timing control module and at least two switch capacitor modules. The timing control module is used to control the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module, so that the charge pump main module charges each of the switch capacitor modules to the corresponding preset voltage. These embodiments will be discussed in detail below.
[0053] In an exemplary embodiment of the present application, see Figure 3As shown, the first end of the main control switch 100 is connected to the clock signal CLK, the input end of the charge pump main module 200 is connected to the second end of the main control switch 100, and the output end is respectively connected to the input end of each of the switch capacitor modules 500, the first end of the voltage feedback module 300 is connected to the control end of the main control switch 100, and the second end is respectively connected to the output end of each of the switch capacitor modules 500, the first end of the timing control module 400 is connected to the third end of the voltage feedback module 300, and the second end is respectively connected to the control end of each of the corresponding switch capacitor modules 500. It should be noted that the clock signal can be generated by an oscillator circuit inside the chip or by a crystal oscillator outside the chip. The oscillator circuit includes a ring oscillator or a voltage-controlled oscillator. Of course, in other embodiments, other oscillators can also be used.
[0054] In an exemplary embodiment of the present application, please continue to refer to Figure 3 As shown, the switch capacitor module 500 includes a switch unit 501 and an output capacitor 502. The first end of the switch unit 501 is connected to the output end of the charge pump main module 200, the second end is connected to the second end of the voltage feedback module 300, the third end and the fourth end are connected to the first end of the output capacitor 502, the control end is connected to the second end of the timing control module 400, the second end of the output capacitor 502 is grounded, and the timing control module 400 is used to control the control switch unit 501 to realize the on and off of the charge pump main module 200 and the voltage feedback module 300 and the corresponding output capacitor 502.
[0055] Please note that Figure 3 and Figure 4As shown, the charge pump circuit includes at least two switch capacitor modules 500, and the output capacitor 502 of the switch capacitor module 500 is arranged outside the chip and connected to the switch unit 501 through the chip port. The switch unit 501 includes a MOSFET tube (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) or a triode. In this embodiment, the switch unit 501 includes two parallel MOSFET tubes. Of course, in other embodiments, the switch unit can also be a combination circuit composed of MOSFET tubes or triodes that acts as a double-pole double-throw switch. In addition, since the required voltage is not consistent, the charge pump main module 200 can only charge the output capacitor 502 of one switch capacitor module 500 at a time. Therefore, the timing control module 400 controls the on and off of each switch unit 501, and then controls the charge pump main module 200 to charge the corresponding output capacitor 502. It is worth noting that the main control switch 100 includes a MOSFET tube or a triode. In other embodiments, the main control switch 100 can be an AND gate composed of a MOSFET tube. The digital signal output by the voltage feedback module is ANDed with the clock signal CLK through the AND gate to control the input of the charge pump main module 200.
[0056] In an exemplary embodiment of the present application, the voltage feedback module 300 is used to control the on and off of the main control switch 100 according to the output voltage of the switch capacitor module 500, so as to control the charge pump main module 200 to charge the switch capacitor module 500. When the charge pump main module 200 charges one of the switch capacitor modules 500, the voltage feedback module 300 samples the output voltage of the corresponding switch capacitor module 500 in real time, and determines whether the output voltage reaches the preset voltage. If yes, the voltage feedback module 300 controls the main control switch 100 to be disconnected, so that the charge pump main module 200 stops charging the switch capacitor module 500. If not, the voltage feedback module 300 controls the main control switch 100 to be closed, so that the charge pump main module 200 starts charging the switch capacitor module 500.
[0057] It should be noted that the voltage feedback module 300 includes a voltage detection unit and a voltage comparator unit. The voltage feedback module 300 samples the output voltage of each switch capacitor module 500 in real time through the voltage detection unit, and compares the output voltage of each switch capacitor module 500 with the corresponding preset voltage through the voltage comparator unit, and outputs the comparison result. The comparison result is used as the control signal of the main control switch 100 to control the on and off of the main control switch 100. It is worth noting that the voltage detection unit can perform voltage sampling by series resistor voltage division, and the preset voltage can be generated by a bandgap voltage reference (Bandgap). The working principle of the Bandgap is to use a voltage with a positive temperature coefficient and another voltage with a negative temperature coefficient. The temperature coefficients of the two are offset to generate a reference voltage that is independent of temperature. The charge pump main module 200 includes a Dickson charge pump or a cross-coupled charge pump, which is used to generate a positive voltage higher than the power supply voltage or a negative voltage lower than the ground voltage. In addition, under normal circumstances, the output voltage of each of the switching capacitor modules 500 will have different current loads. When not charging, the output voltage will decrease over time (or increase for negative voltage). Therefore, in actual applications, the charge pump main module 200 needs to cyclically charge each of the switching capacitor modules 500 to prevent the output capacitor voltage from deviating from the preset voltage.
[0058] In an exemplary embodiment of the present application, the timing control module 400 is used to control the switching of the switch capacitor module 500 and the switching of the preset voltage of the voltage feedback module 300, so that the charge pump main module 200 charges each switch capacitor module 500 to the corresponding preset voltage.
[0059] It should be noted that, by adopting different switch switching timings, the charge pump circuit will have different working modes. In this embodiment, the switch switching timing includes a fixed timing and a seamless timing.
[0060] In an exemplary embodiment of the present application, the timing control module 400 controls the switching of the switch capacitor module 500 and the switching of the preset voltage of the voltage feedback module 300 according to a fixed timing, so that the charge pump main module 200 charges the output capacitor of each switch capacitor module 500 to the corresponding preset voltage.
[0061] Specifically, when the output capacitor of one of the switch capacitor modules 500 is charged to the corresponding preset voltage, it is determined whether the actual charging time of the output capacitor 502 of the switch capacitor module 500 reaches the preset charging time. If yes, switch to the next switch capacitor module 500 to charge the output capacitor of the switch capacitor module 500; if not, do not switch to the next switch capacitor module 500, and before the preset charging time is reached, the output voltage of the switch capacitor module 500 is maintained at the corresponding preset voltage. It should be noted that the fixed timing indicates that the charging timing is pre-set, and the charge pump main module 200 charges the output capacitors 502 of each switch capacitor module 500 in turn according to the fixed timing. The charging time of each output capacitor 502 can be the same or different, but it must be ensured that it can be charged to the corresponding preset voltage. Taking the positive pressure charge pump as an example, please refer to Figure 5 As shown, Figure 5 It is the positive voltage charging timing and voltage waveform under fixed timing. Among them, SW1 to SWn are the charging timing of the output capacitor 502 of each of the switch capacitor modules 500, respectively. The high level indicates that the switch is closed, and the charge pump main module 200 and the voltage feedback circuit 300 are connected to the output capacitor 502 of the switch capacitor module 500. The low level indicates that the switch is disconnected, and the charge pump main module 200 and the voltage feedback circuit 300 are disconnected from the output capacitor 502 of the switch capacitor module 500. V1 to Vn are the voltage waveforms of the output capacitor 502 of each of the switch capacitor modules 500, T1 to Tn are the charging time of the output capacitor 502 of each of the switch capacitor modules 500, respectively, and T is the total time for the output capacitor 502 of each of the switch capacitor modules 500 to complete a round of charging, that is, the charging cycle. It can be seen that within the corresponding charging time, the voltage of the output capacitor 502 of each of the switch capacitor modules 500 will be charged to the preset voltage and then remain unchanged until the voltage drops (or rises) due to the presence of the load after the charging time ends, and the above process will be repeated in the next charging cycle. RV1 to RVn represent the voltage ripple of the output capacitor 502 of each of the switch capacitor modules 500. Under a fixed current load, the ripple voltage is equal to the product of the load current and the total charging time of all other output capacitors 502, divided by the current capacitance of the output capacitor 502. It should be noted that the capacitance of the off-chip capacitor is very large, and when the charging current is greater than the sum of all load currents, the ripple voltage will be relatively small.
[0062] In an exemplary embodiment of the present application, the timing control module 400 controls the switching of the switch capacitor module 500 and the switching of the preset voltage of the voltage feedback module 300 according to a seamless timing, so that the charge pump main module 200 charges the output capacitor 502 of each switch capacitor module 500 to the corresponding preset voltage. When the output capacitor 502 of one of the switch capacitor modules 500 is charged to the corresponding preset voltage, it directly switches to the next switch capacitor module 500 to charge the output capacitor 502 of the switch capacitor module 500.
[0063] It should be noted that the seamless timing does not set the charging time of each output capacitor. As long as the current output capacitor voltage is charged to the set voltage, it will automatically switch to the next output capacitor. By controlling the charge pump main module 200 to charge each of the switch capacitor modules 500 through the seamless timing, the charging cycle is greatly shortened and the voltage ripple is reduced. Taking the positive voltage charge pump as an example, the positive voltage charging timing and voltage waveform under the seamless timing are as follows: Figure 6 As shown. Figure 6 As shown, after V1 is charged to the preset voltage, it automatically switches to V2, and there is no voltage holding time. Therefore, the total charging cycle is shortened and the voltage ripple is reduced accordingly. At the same time, due to the reduction of voltage ripple, the charging time of the output capacitor 502 of each switch capacitor module 500 is also shortened, further reducing the charging cycle, thereby reducing the voltage ripple. For the negative charge pump, the charging timing and voltage waveform under fixed timing and seamless timing are respectively as follows Figure 7 and Figure 8 As shown, since its timing control principle is similar to that of the positive charge pump, it will not be described in detail.
[0064] In summary, the present invention provides a charge pump circuit including a main control switch, a charge pump main module, a voltage feedback module, a timing control module and at least two switch capacitor modules. The first end of the main control switch is connected to the clock signal, the input end of the charge pump main module is connected to the second end of the main control switch, and the output end is respectively connected to the input end of each switch capacitor module, the first end of the voltage feedback module is connected to the control end of the main control switch, and the second end is respectively connected to the output end of each switch capacitor module, the first end of the timing control module is connected to the third end of the voltage feedback module, and the second end is respectively connected to the control end of each corresponding switch capacitor module. The timing control module is used to control the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module, so that the charge pump main module charges each switch capacitor module to the corresponding preset voltage. The charge pump circuit of the present invention uses a time-division multiplexing method to control the charge pump main module to charge each switch capacitor module, and the output capacitor of the switch capacitor module is set outside the chip, so that a small area and low power consumption can be maintained while generating multiple voltages.
[0065] Based on the same inventive concept, another embodiment of the present invention further provides a power supply chip, which includes the charge pump circuit described in any of the above-mentioned embodiments. It can be understood that since the power supply chip provided in this embodiment belongs to the same inventive concept as the charge pump circuit provided in any of the above-mentioned embodiments, it has at least the same beneficial effects as the charge pump circuit, and they will not be described one by one here.
[0066] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, such as a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.
[0067] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.
Claims
1. A charge pump circuit, characterized in that: It includes a main control switch, a charge pump main module, a voltage feedback module, a timing control module and at least two switch capacitor modules; The first end of the main control switch is connected to the clock signal; The input end of the charge pump main module is connected to the second end of the main control switch, and the output end is respectively connected to the input end of each of the switch capacitor modules; The first end of the voltage feedback module is connected to the control end of the main control switch, and the second end is connected to the output end of each of the switch capacitor modules respectively; The first end of the timing control module is connected to the third end of the voltage feedback module, and the second end is respectively connected to the control end of each corresponding switch capacitor module; The timing control module is used to control the switching of the switch capacitor modules and the switching of the preset voltage of the voltage feedback module, so that the charge pump main module charges each switch capacitor module to the corresponding preset voltage.
2. The charge pump circuit according to claim 1, characterized in that: The main control switch includes a triode or a MOSFET tube.
3. The charge pump circuit according to claim 1, characterized in that: The voltage feedback module is used to control the on-off of the main control switch according to the output voltage of the switch capacitor module, so as to control the charge pump main module to charge the switch capacitor module; When the charge pump main module charges one of the switch capacitor modules, the voltage feedback module samples the output voltage of the corresponding switch capacitor module in real time, and determines whether the output voltage reaches the preset voltage; If yes, the voltage feedback module controls the main control switch to be turned off, so that the charge pump main module stops charging the switch capacitor module; If not, the voltage feedback module controls the main control switch to close, so that the charge pump main module starts to charge the switch capacitor module.
4. The charge pump circuit according to claim 1, characterized in that: The switch capacitor module includes a switch unit and an output capacitor; The first end of the switch unit is connected to the output end of the charge pump main module, the second end is connected to the second end of the voltage feedback module, the third end and the fourth end are connected to the first end of the output capacitor, and the control end is connected to the second end of the timing control module; The second end of the output capacitor is grounded; The timing control module is used to control the switch unit to realize the switching between the charge pump main module and the voltage feedback module and the corresponding output capacitor.
5. The charge pump circuit according to claim 4, characterized in that: The output capacitor is arranged outside the chip and connected to the switch unit through a chip port.
6. The charge pump circuit according to claim 4, characterized in that: The switch unit includes two MOSFET tubes connected in parallel.
7. The charge pump circuit according to claim 4, characterized in that: The timing control module controls the switching of the switch capacitor modules and the switching of the preset voltage of the voltage feedback module according to a fixed timing, so that the charge pump main module charges the output capacitor of each switch capacitor module to the corresponding preset voltage.
8. The charge pump circuit according to claim 7, characterized in that: The switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module are controlled according to a fixed timing so that the charge pump main module charges the output capacitor of each switch capacitor module to the corresponding preset voltage, including: When the output capacitor of one of the switch capacitor modules is charged to the corresponding preset voltage, determining whether the actual charging time of the output capacitor of the switch capacitor module reaches the preset charging time; If yes, switch to the next switch capacitor module to charge the output capacitor of the switch capacitor module; If not, the next switch capacitor module is not switched to, and the output voltage of the switch capacitor module is maintained at the corresponding preset voltage before the preset charging time is reached.
9. The charge pump circuit according to claim 4, characterized in that: The timing control module controls the switching of the switch capacitor module and the switching of the preset voltage of the voltage feedback module according to the seamless timing, so that the charge pump main module charges the output capacitor of each switch capacitor module to the corresponding preset voltage; When the output capacitor of one of the switch capacitor modules is charged to a corresponding preset voltage, the next switch capacitor module is directly switched to charge the output capacitor of the switch capacitor module.
10. A power supply chip, characterized in that: The invention comprises a charge pump circuit as claimed in any one of claims 1 to 9.