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US 7,622,900 B2Granted
Semiconductor integrated circuit supplying voltage to a load using a charge pump and electronic device including the same
AssigneeRohm Co., Ltd.
InventorKunihiro Komiya
Life of this patent
Estimating the term…
Abstract
A semiconductor integrated circuit includes a charge pump boosting an input voltage and outputting the boosted voltage to a load, and a charge pump control circuit outputting a voltage to the charge pump based on the output voltage of the charge pump and determining an upper limit value of a current to be output to the charge pump based on the output voltage of the charge pump.
Claims4
A semiconductor integrated circuit, comprising:
- a charge pump arranged to boost an input voltage and to provide the boosted voltage to a load;
- and
- a charge pump control circuit arranged to provide a voltage to the charge pump based on an output voltage of the charge pump, and to determine an upper limit value of a current to be provided to the charge pump based on the output voltage of the charge pump, wherein said charge pump control circuit includes:
- a comparator arranged to compare the output voltage of said charge pump with a prescribed voltage and to provide a signal representing a result of said comparison, and
- a regulator arranged to determine an upper limit value of a current to be provided to said charge pump based on the signal received from said comparator;
- and
- wherein said comparator has a hysteresis characteristic.
4 more elements
An electronic device comprising a semiconductor integrated circuit, wherein said semiconductor integrated circuit includes:
- a charge pump arranged to boost an input voltage and to provide said boosted voltage to a load, and
- a charge pump control circuit arranged to provide a voltage to said charge pump based on an output voltage of said charge pump, and to determine an upper limit value of a current to be provided to said charge pump based on the output voltage of said charge pump, wherein said charge pump control circuit includes:
- a comparator arranged to compare the output voltage of the charge pump with a prescribed voltage and to provide a signal representing a result of the comparison, and
- a regulator arranged to determine an upper limit value of a current to be provided to the charge pump based on the signal received from the comparator;
- and
- wherein the comparator has a hysteresis characteristic.
3 more elements
Dependencies are inferred from the claim text.