| 摘要 |
A boosting converter boosts a battery voltage by a charge pump circuit and then outputs a boosted voltage. A detected output voltage of the charge pump circuit is fed back to a regulator circuit. A reference voltage comparator compares the detected output voltage with a reference voltage and, according to the comparison result, performs an ON/OFF control of a transistor, thereby adjusting the power from the battery voltage and supplying it as an input voltage to the charge pump circuit. A power supply voltage comparator compares a detected battery voltage with a reference battery voltage. According to the comparison result, the power supply voltage comparator sends a boosting rate select signal to the charge pump circuit, thereby switching the boosting rate of the charge pump.
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