Voltage regulated charge pump with regulated charge current into the flying capacitor
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United States of America Patent
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-
Oct 2, 2007
Grant Date -
Jan 18, 2007
app pub date -
Jul 27, 2005
filing date -
Jul 18, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A charge pump circuit with a regulated charge current where the amount of current flowing into the flying capacitor depends on the magnitude of the output voltage error, using an OTA to convert the output voltage error into a current. Thus the flying capacitor is not charged when the output load is very low or when the output voltage error is minimal. Voltage overshoots are reduced by a stop circuit which forces pulse skipping and which inhibits the charging of the flying capacitor. Current limiting devices further limit the charge current into the flying capacitor. Full short-circuit protection is provided in one preferred embodiment by current limiting the driver stage of the charge pump circuit. Except for pulse skipping, the charge pump runs at a constant frequency supplied by a clock.
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