POWER SUPPLY CIRCUIT AND PORTABLE DEVICE
First Claim
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1. A power supply circuit, comprising:
- a charge pump (CHP) type step-up circuit having multiple stages of CHP units including a first through a last CHP units and adapted to step up an inputted power supply voltage to a higher step-up voltage;
an output voltage generation circuit for converting said step-up voltage into a required output voltage based on an output voltage setting signal;
a voltage comparison circuit having at least one comparator for comparing the detection voltage associated with said output voltage with a reference voltage to generate a comparison signal; and
a switchable control circuit for controlling the number of operable stages of said CHP type step-up circuit based on said comparison signal.
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Abstract
A power supply circuit has a charge pump (CHP) step-up circuit including multiple CHP units for stepping up a given power supply voltage to a step-up voltage higher than the power supply voltage, and, based on an output voltage setting signal, converts the step-up voltage to a required output voltage. A comparator compares the detection voltage associated with the output voltage with a reference voltage to generate a comparison signal. In supplying a required output voltage, the number of operable CHP units can be changed to control the step-up voltage based on the comparison signal.
18 Citations
11 Claims
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1. A power supply circuit, comprising:
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a charge pump (CHP) type step-up circuit having multiple stages of CHP units including a first through a last CHP units and adapted to step up an inputted power supply voltage to a higher step-up voltage; an output voltage generation circuit for converting said step-up voltage into a required output voltage based on an output voltage setting signal; a voltage comparison circuit having at least one comparator for comparing the detection voltage associated with said output voltage with a reference voltage to generate a comparison signal; and a switchable control circuit for controlling the number of operable stages of said CHP type step-up circuit based on said comparison signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification