Patent ID: 7443152
Filing Date: 2008-10-28
Classification: H02M

Abstract:
1. A semiconductor device, comprising: an input power supply configured to supply input power; a booster circuit configured to boost the input power supplied from the input power supply, the booster circuit having an input terminal that receives the input power from the input power supply, a power receiving terminal that receives operation power for operating the booster circuit, and an output terminal that outputs the boosted input power to a load; a switching device connected between the input power supply and the power receiving terminal of the booster circuit and configured to switch the operation power received by the power receiving terminal between the input power from the input power supply and the boosted input power from the output terminal; and a voltage detection circuit responsive to a voltage change of the operation power at the power receiving terminal of the booster circuit to control the switching device to select between the input power from the input power supply and the boosted input power from the output terminal.