Patent ID: 7737767
Filing Date: 2010-06-15
Classification: H02M,H03K

Abstract:
1. A control circuit for a charge pump circuit including at least a single flying capacitor and at least a single output capacitor, comprising: a first group of switches including at least a single switch provided on a path which charges said flying capacitor using an input voltage; a second group of switches including at least a single switch provided on a path which charges said output capacitor using the electric charge accumulated in said flying capacitor; a pulse modulator which generates a pulse signal having a fixed duty ratio and a frequency which is adjusted such that a feedback voltage corresponding to the output voltage of said charge pump circuit is coincident with a predetermined first reference voltage; and a driver which receives said pulse signal and turns on one of said first and second groups of switches during the time periods corresponding to the high time periods of said pulse signal and turns on the other one of said first and second groups of switches during the time periods corresponding to the low time periods of said pulse signal; wherein said pulse modulator comprises: