Charge pump-type DC/DC converter

摘要

A charge pump-type DC/DC converter is provided that steadily operates even when boosting reference voltage is low. A PMOS transistor for short-circuiting an output terminal of a charge pump of an initial stage with a booster reference voltage is provided to eliminate the influence of a parasitic diode of a PMOS transistor within the charge pump of the initial stage during build-up. The PMOS transistor is controlled by the voltage of another charge pump and the short-circuit described above is released by the increase of the output voltage of the other charge pump.