A charge pump and electronic equipment including the same

Abstract

An embodiment of the present invention provides a charge pump circuit. The circuit includes a first PMOS transistor and a first NMOS transistor connected in series on the charge and discharge main circuit, the gate of the first PMOS transistor is controlled by the inverse signal of the first control signal, and the gate of the first NMOS transistor is controlled by the second control signal Control; including the second PMOS transistor on the first branch, the gate is controlled by the first control signal; including the second NMOS transistor on the second branch, the gate is controlled by the inverse signal of the second control signal; wherein, in different Under the control of the first control signal and the second control signal, the first node where the drain of the first PMOS transistor is located, the second node where the drain of the second PMOS transistor is located, and the third node where the drain of the second NMOS transistor is located Nodes maintain the same or similar voltages. Embodiments of the present invention solve the problem of leakage current. At the same time, in different stages, since the voltages between corresponding nodes are equal or approximately the same, there is no need for voltage recovery.

Description

technical field [0001] This invention relates to electronic devices, and more particularly to charge pumps. Background technique [0002] A charge pump, also known as a switched capacitor voltage converter, is a type of DC-DC (converter) that uses so-called "flying" or "pumping" capacitors to store energy. They can step up or down the input voltage and can also be used to generate negative voltages. Its internal FET switch array controls the charging and discharging of the flying capacitor in a certain way, so that the input voltage is multiplied or reduced by a certain factor, so as to obtain the required output voltage. This special modulation process can guarantee up to 80% efficiency, and only external ceramic capacitors are needed. [0003] In current electronic devices, MOS transistors are usually used to implement charge pump circuits. However, since the MOS transistor has a certain degree of leakage current, the charge pump has a certain degree of leakage current,...

AI Technical Summary

Problems solved by technology

However, due to a certain degree of leakage current in the MOS transistor, there is a certain leakage current in the charge pump, resulting in high power consumption of electronic equipment.

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