Patent ID: 8045349
Filing Date: 2011-10-25
Classification: H02M

Abstract:
1. A charge pump-type DC/DC converter, comprising: a plurality of stages of charge pumps connected in series, wherein a charge pump in each stage outputs a voltage that is a multiple of a reference voltage and includes a driving circuit, operated by a first output voltage of a first charge pump of an initial stage, that generates driving signals for driving the first and the second transistors within the first charge pump; and a third transistor that turns ON when a second output voltage of a second charge pump, which is any one of the charge pumps at or after a second stage, is low to provide the reference voltage to a first output terminal of the first charge pump, and turns OFF when the second output voltage is high to disconnect the reference voltage from the first output terminal, wherein an output voltage of a charge pump of a final stage is applied to substrates of the first and second transistors of the charge pumps at and after the second stage.