Patent ID: 7847621

Claim:
A control circuit for a charge pump circuit including a flying capacitor and an output capacitor, comprising: a first switch arranged between a first input terminal to which a first input voltage is applied and one end of the flying capacitor; a second switch arranged between the other end of the flying capacitor and a fixed voltage terminal; a third switch arranged between a second input terminal to which a second input voltage is applied and the other end of the flying capacitor; a fourth switch arranged between the one end of the flying capacitor and one end of the output capacitor; and a driver which turns on any one of a first pair consisting of the first and second switches and a second pair consisting of the third and fourth switches during a period corresponding to a high period of a pulse signal and which turns on the other pair during a period corresponding to a low period of the pulse signal, wherein the driver turns on the first and fourth switches during a predetermined precharge period after the start of activation of the charge pump circuit to charge the output capacitor and, thereafter, alternately turns on and off the first and second pairs on the basis of the pulse signal.