SYSTEM AND METHOD FOR PROVIDING PULSE FREQUENCY MODULATION MODE
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United States of America Patent
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Issued Date -
Mar 18, 2010
app pub date -
Jul 21, 2009
filing date -
Sep 18, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A voltage regulator comprises switching circuitry for generating a phase voltage at a phase node responsive to an input voltage and switching control signals. An inductor is connected to the phase node and an output voltage node. A capacitor is connected between the output voltage node and ground. An error amplifier generates an error voltage responsive to an output voltage from the output voltage node and a reference voltage. Switching control circuitry generates switching control signals to the switching circuitry responsive to the error voltage, a ramp voltage and an established voltage level. The switching control circuitry operates the voltage regulator in a pulse frequency modulation mode of operation after sampling the error voltage and setting the established voltage level and exits the pulse frequency modulation mode of operation when the error voltage falls below the established voltage level.
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