Patent ID: 7768340
Filing Date: 2010-08-03
Classification: H02M

Abstract:
1. A voltage pumping device comprising: a supply voltage detector configured to receive a source voltage signal of a first voltage level and generate a switching signal which is enabled in response to the source voltage signal of the first voltage level; a first switching device connected between a first voltage supply terminal and an output terminal, the first switching device generating a source voltage in response to a first signal level of the switching signal and outputting the generated source voltage to the output terminal; a second switching device connected between a second voltage supply terminal and the output terminal, the second switching device generating the source voltage in response to a second signal level of the switching signal and outputting the generated source voltage to the output terminal; and a pumping circuit configured to receive an internal voltage and the source voltage, and pump the source voltage to provide the internal voltage, wherein the first and second switching devices are p-channel metal oxide semiconductor (PMOS) transistors.