Negative voltage charge pump circuit, chip and electronic device
By controlling the charging and discharging switches in the negative voltage charge pump circuit using an asymmetric driving method, and utilizing the voltage across the flying capacitor and the reference ground for control, the withstand voltage of the driver is reduced, solving the problem of excessively high withstand voltage of driver components in the prior art, and achieving simplified circuit design and cost reduction.
CN116155086BActive Publication Date: 2026-07-21SG MICRO CORP
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SG MICRO CORP
- Filing Date
- 2022-12-30
- Publication Date
- 2026-07-21
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Figure CN116155086B_ABST
Abstract
The application discloses a negative voltage charge pump circuit, a chip and electronic equipment. The negative voltage charge pump circuit comprises a charge redistribution module, a flying capacitor, first and second charging switches and first and second discharging switches. The charge redistribution module is used for redistributing the charge of the flying capacitor by using a charge pump operation through the charging and discharging switches to obtain an output voltage of negative voltage. A driving circuit is used for controlling the opening and closing of the charging and discharging switches to realize the charge pump operation. The driving circuit is configured to control the charging and discharging switches in an asymmetric driving mode in the charge pump operation, so that the withstand voltage value of each element in the driving circuit is not less than the power supply voltage.
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