Multiple output charge pump
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United States of America Patent
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-
Oct 21, 2003
Grant Date -
Jan 24, 2002
app pub date -
Jun 12, 2001
filing date -
Jun 13, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A single mode buck/boost charge pump has multiple outputs and is adapted to power a plurality of separate loads, such as light emitting diodes, in a highly efficient manner. The multiple outputs have different voltages. The output current or voltage of at least one of the multiple outputs is regulated by a feedback circuit. The feedback circuit provides a control signal based on a comparison of a reference voltage with a feedback voltage. The feedback voltage is proportional to an output voltage when the charge pump is configured to regulate the output voltage. Alternately, the feedback voltage is a sense voltage across a sense resistor connected in series with a load when the charge pump is configured to regulate output current provided to the load.
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