Patent ID: 7122995

Claim:
A multi-phase DC—DC converter comprising: an output terminal; a plurality of converter units, each receiving an input voltage and generating an output voltage for said output terminal; and a control unit connected to the plurality of converter units, the control unit including: a first voltage comparator for comparing the output voltage with a first reference voltage to generate a first voltage comparison signal indicating the comparison result; a current comparison circuit for comparing a plurality of output currents that are in accordance with the output voltages of the converter units to generate a plurality of current comparison signals respectively corresponding to the converter units; and a signal generation circuit, connected to the first voltage comparator and the current comparison circuit, for generating a plurality of control signals for respectively controlling the converter units so that a converter unit through which a smaller output current flows is operated in accordance with the current comparison signals generated by the current comparison circuit when the first voltage comparison signal indicates that the output voltage is lower than the first reference voltage.