CHARGE PUMP CIRCUIT
First Claim
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1. A charge pump circuit, comprising:
- a booster circuit;
a voltage detection circuit;
an oscillator circuit; and
a discharge circuit,the booster circuit performing a boosting operation based on a pumping pulse output from the oscillator circuit and outputting a boosted voltage,the voltage detection circuit operating so that the boosted voltage becomes a desired voltage by controlling the oscillator circuit to operate when the boosted voltage is smaller than the desired voltage and controlling the oscillator circuit to stop operating when the boosted voltage is equal to or larger than the desired voltage,the oscillator circuit outputting the pumping pulse so that the booster circuit performs the boosting operation when operating, and not outputting the pumping pulse when stopping operating,the discharge circuit not discharging an output terminal of the charge pump circuit when the boosted voltage is smaller than an overshoot voltage, and discharging the output terminal of the charge pump circuit when the boosted voltage is equal to or larger than the overshoot voltage.
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Abstract
Provided is a charge pump circuit capable of shortening a settling time. When a boosted voltage (Vout) becomes high to be equal to or larger than an overshoot voltage, a transistor (T1) is turned on and an output terminal of the charge pump circuit is discharged. Accordingly, it is easy to reduce the boosted voltage (Vout) after an occurrence of an overshoot, and a period of time in which the boosted voltage (Vout) decreases from a voltage after the occurrence of the overshoot to a desired voltage is shortened, leading to a reduction in a settling time.
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Citations
8 Claims
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1. A charge pump circuit, comprising:
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a booster circuit; a voltage detection circuit; an oscillator circuit; and a discharge circuit, the booster circuit performing a boosting operation based on a pumping pulse output from the oscillator circuit and outputting a boosted voltage, the voltage detection circuit operating so that the boosted voltage becomes a desired voltage by controlling the oscillator circuit to operate when the boosted voltage is smaller than the desired voltage and controlling the oscillator circuit to stop operating when the boosted voltage is equal to or larger than the desired voltage, the oscillator circuit outputting the pumping pulse so that the booster circuit performs the boosting operation when operating, and not outputting the pumping pulse when stopping operating, the discharge circuit not discharging an output terminal of the charge pump circuit when the boosted voltage is smaller than an overshoot voltage, and discharging the output terminal of the charge pump circuit when the boosted voltage is equal to or larger than the overshoot voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification