Charge pump circuit and control method for a charge pump circuit

Abstract

The application discloses a charge pump circuit and a control method thereof. The charge pump circuit comprises: an input end receiving a supply voltage; an output end providing an output voltage; a first switch tube having a first end, a second end and a control end, and when turned on, the current of the first switch tube flows from the first end to the second end; a first capacitor having a first end and a second end, the first end being coupled to the first end of the first switch tube or the second end of the first switch tube; an adjusting circuit receiving the output voltage and a first switch control signal, and generating an adjusting signal according to the output voltage and the first switch control signal to control the turn-on and turn-off of the first switch tube; and the adjusting signal controls the turn-on resistance of the first switch tube to adjust the output voltage. The adjusting circuit generates the adjusting signal according to the output voltage and the first switch control signal to control the turn-on resistance of the first switch tube, thereby feeding back the output voltage and improving the problem of unstable output voltage of the charge pump.

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