Charge pump DC/DC converter circuit
First Claim
1. A charge pump DC/DC converter circuit, in which, in a first period of charge pump, a first-stage capacitor is charged up to a power supply voltage by turning on first semiconductor switches on a charging path to the first-stage capacitor, and in a second period, of the charge pump, which is subsequent to the first period, a second-stage capacitor is charged up to a voltage which is sum of a voltage of the first-stage capacitor thus charged and the power supply voltage, by turning on second semiconductor switches on a charging path to the second-stage capacitor, so that a voltage of a last-stage capacitor is outputted as an output voltage, the charge pump DC/DC converter circuit comprising:
- a first monitor circuit which detects a potential difference between terminals of one of the first semiconductor switches turning on in the first period, so as to output a first determining signal corresponding to the detected potential difference; and
a first drive circuit which outputs a drive signal to at least one of the first semiconductor switches in response to the first determining signal, the drive signal increasing on-resistance of at least one of the first semiconductor switches in proportion to the detected potential difference.
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Abstract
A charge pump DC/DC converter circuit of the present invention includes: a monitor circuit that detects a potential difference between terminals of a semiconductor switch that turns on during a first period, so as to output a determining signal corresponding to the potential difference; and each of drive circuits that outputs a drive signal to a semiconductor switch that turns on during a first period, in response to the determining signal. The drive signal increases the on-resistance of the semiconductor switch in proportion to the detected potential difference.
29 Citations
17 Claims
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1. A charge pump DC/DC converter circuit, in which,
in a first period of charge pump, a first-stage capacitor is charged up to a power supply voltage by turning on first semiconductor switches on a charging path to the first-stage capacitor, and in a second period, of the charge pump, which is subsequent to the first period, a second-stage capacitor is charged up to a voltage which is sum of a voltage of the first-stage capacitor thus charged and the power supply voltage, by turning on second semiconductor switches on a charging path to the second-stage capacitor, so that a voltage of a last-stage capacitor is outputted as an output voltage, the charge pump DC/DC converter circuit comprising: -
a first monitor circuit which detects a potential difference between terminals of one of the first semiconductor switches turning on in the first period, so as to output a first determining signal corresponding to the detected potential difference; and
a first drive circuit which outputs a drive signal to at least one of the first semiconductor switches in response to the first determining signal, the drive signal increasing on-resistance of at least one of the first semiconductor switches in proportion to the detected potential difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification