| 摘要 |
There is provided a booster circuit which can feed a power source to a control circuit to enable operation with a low-voltage input power source when a power supply is turned on.A charge pump circuit comprises: four capacitors C1, C2, C3 and C4 provided between an input power source (VDD) line 20 and a ground; switches for charging 30 and 32 connected to both ends of the capacitor C1; switches 34 and 36 for charging connected to both ends of the capacitor C2; switches 38 and 40 for charging connected to both ends of the capacitor C3; switches for charging 42 and 44 connected to both ends of the capacitor C4; switches for boosting 46, 48, 50, 52 and 54; and a capacitor C5 for holding an output voltage. The ON/OFF changeover of each switch is controlled by a control circuit.
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