Charge pump circuit
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United States of America Patent
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Mar 28, 2017
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N/A
app pub date -
Mar 18, 2016
filing date -
Mar 30, 2015
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Abstract
When a voltage difference between a raised output voltage vcp and an input voltage vin is larger than a set voltage value, based on a added-on voltage vup detected by a voltage monitor 3 or a current iu passing through the voltage monitor 3, the clock generator controller 4 is activated. Then the clock generator controller 4 draws in a frequency control current iw from a clock generator 1 side, switches the frequency Fclk of a clock signal CLK generated by the clock generator 1 from a first frequency, which is comparatively high, to a second frequency, which is one or more digits lower than the first frequency, and applies the clock signal CLK to the voltage raiser 2. The voltage raiser 2 saves power by performing voltage raising (charge pumping) at the second frequency.
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