Charge pump-type DC/DC converter
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United States of America Patent
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Oct 25, 2011
Grant Date -
May 22, 2008
app pub date -
Oct 19, 2007
filing date -
Nov 22, 2006
priority date (Note) -
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Abstract
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.
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