Patent ID: 7576592

Claim:
A charge pump circuit comprising: a first voltage generation unit regulating a first output signal at a first voltage in response to an input signal; a second voltage generation unit boosting a second output signal to a second voltage in response to the first output signal; a third voltage generation unit boosting a third output signal to a third voltage in response to the first output signal and the second output signal; a first voltage control unit connected between the first voltage generation unit and the third voltage generation unit, the first voltage control unit blocking the first output signal to be output to the third voltage generation unit during the boosting time for the second output signal; a second voltage control unit connected between the second voltage generation unit and the third voltage generation unit, the second voltage control unit blocking the second output signal to be output to the third voltage generation unit during the boosting time for the second output signal; and a latch-up prevention unit preventing a latch-up operation caused by a parasitic transistor until the third output signal is constantly maintained at the third voltage.