Patent ID: 7626446

Claim:
A charge pump capable of enhancing power efficiency and output voltage, comprising: a pump capacitor; a switching module, coupled to a first terminal of the pump capacitor; a first switch, coupled between a second terminal of the pump capacitor and a supply voltage; a first buffer, receiving a first input signal, producing a control signal for controlling the first switch to turn on or cut off, the range of the voltage levels of the first input signal being between a first voltage and a second voltage, the first voltage and the second voltage relating to the gate-to-source voltage of the first switch, wherein once the first switch is turned on, the gate-to-source voltage of the first switch is a multiple, which is greater than one, of the supply voltage; a switching mechanism, coupled to the first switch and the pump capacitor for switching the pump capacitor to output a pump voltage; and an output capacitor, coupled to the second switch and the pump capacitor for stabilizing and outputting the pump voltage; wherein, the switching module further includes: a second switch, coupled to the supply voltage and the first terminal of the pump capacitor; and a second buffer, coupled to the second switch, receiving a second input signal for controlling the second switch to turn on or cut off, and the voltage levels of the second input signal ranging from the supply voltage to the negative of the supply voltage.