| 摘要 |
To provide a voltage generating circuit for generating a boosted voltage on the basis of a power source voltage or any voltage. A voltage generating circuit having a boosting circuit 1 for generating a voltage higher than a power source voltage, and a reference voltage generating circuit 2 for generating a reference voltage Vref is equipped with a voltage variation detecting circuit 4 having a first input connected to the output of the boosting circuit 1 , a second input having a power source Vdd and a third input connected to the ground Vss, a control voltage Vfd being generated at a first output by making reference current equivalent to current occurring due to the potential difference between the first input and the second input flow into the third input, a differential amplifier circuit 61 for comparing the control voltage Vfd and the reference voltage Vref, and a clamp circuit 62 for extracting current from the output of the boosting circuit 1 in accordance with the output of the differential amplifier circuit 61 , thereby controlling the output voltage of the boosting circuit 1.
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