High efficiency charge pump circuit
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United States of America Patent
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Jun 11, 1991
Grant Date -
N/A
app pub date -
Mar 26, 1990
filing date -
Mar 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated circuit device includes a charge pump to provide current at a potential which is greater than a supply potential. A potential maintenance circuit gates on when the potential at the output of the charge pump circuit drops to a level which is below V.sub.CC. The potential maintenance circuit permits the charge pump can be bypassed or designed to provide a minimum current output. An overvoltage shutoff circuit permits the charge pump to be effectively bypassed when supply voltage is sufficiently high to make bypass desireable.
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