Patent ID: 7560910
Filing Date: 2009-07-14
Classification: H02M,Y02B,Y10S

Abstract:
1. A boost converter that complementarily switches first and second MOS transistors flowing, in different directions, an electric current supplied from an input terminal coupled to an inductor and can thereby perform a boost operation of generating a boost voltage at an output terminal coupled to the second MOS transistor, the boost converter comprising: a third MOS transistor coupled between a substrate of the second MOS transistor and an electrode toward the input terminal of the second MOS transistor; a fourth MOS transistor coupled between the substrate of the second MOS transistor and an electrode toward the output terminal of the second MOS transistor; and a control circuit that turns off the third MOS transistor and turns on the fourth MOS transistor during the boost operation, turns on the third MOS transistor and turns off the fourth MOS transistor in a boost disabling state of turning off the first and second MOS transistors, and charges the electrode toward the output terminal of the second MOS transistor before starting the boost operation from the boost disabling state, wherein the second, third, and fourth MOS transistors are of p-channel type.