Patent ID: 6756772
Filing Date: 2004-06-29
Classification: H02M,Y02B

Abstract:
A dual-output direct current (DC) voltage converter for converting an input DC voltage to at least two different output DC voltages, comprising:an input terminal for receiving the input DC voltage from a power voltage source; a step-down voltage regulator circuit connected to the input terminal for providing a regulated output DC voltage lower than the input DC voltage; and a charge pump circuit connected to the input terminal and coupled to the step-down voltage regulator circuit, for providing an auxiliary output DC voltage higher than the input DC voltage; wherein the step-down voltage regulator circuit includes first and second switches coupled in series between the input terminal and a ground potential, and an output filter connected at a junction between the first and second switches; and the charge pump circuit is further coupled to the step-down voltage regulator circuit at the junction between the first and second switches of the step-down voltage regulator circuit.