Highly efficient step-down/step-up and step-up/step-down charge pump
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United States of America Patent
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Dec 2, 2003
Grant Date -
N/A
app pub date -
Jul 16, 2002
filing date -
Jul 16, 2002
priority date (Note) -
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Abstract
A charge pumping system capable of a forward operation mode and a reverse operation mode is provided. In forward operation mode the charge pumping system can step-up an input voltage at a ratio of 1/2:1 and can step-down the input voltage at a ratio of at east one of 1:1, 3:2, 2:1 and 3:1. In reverse operation mode the charge pumping system can step-down the input voltage at a ratio of 1:1/2and 1:1 and can step-up the input voltage at a ratio of at least one of 2:3, 1:2 and 1:3.
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