Charge pump DC/DC converter with constant-frequency operation
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United States of America Patent
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Issued Date -
Jan 12, 2006
app pub date -
Jul 8, 2004
filing date -
Jul 8, 2004
priority date (Note) -
Abandoned
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Abstract
A DC/DC voltage converter includes a charge pump circuit including a pump capacitor coupling at an output node, a switching device for switching the charge pump circuit between a first phase and a second phase, and an adjustable resistor for adjusting a magnitude of the output voltage at the second phase, wherein at the first phase, a current flows to charge the pump capacitor, and at the second phase, said current flows from the pump capacitor to the output node. A feedback loop circuitry is electrically coupling with the charge pump circuit for generating a control signal to the adjustable resistor to control the output voltage at the output node in a constant manner when said current is increased. Therefore, the voltage converter is adapted to perform good load regulation ability to prevent variations and fluctuations in the output voltage corresponding to load variations and fluctuations.
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