POWER SUPPLY UNIT, SEMICONDUCTOR DEVICE, AND WIRELESS COMMUNICATION DEVICE
First Claim
1. A power supply unit capable of changing dynamic output voltage comprising:
- a first node for outputting the output voltage;
a first regulator for dropping, down input voltage by a switching method and outputting the resultant voltage to the first node;
a second regulator for dropping down the input voltage by voltage drop and outputting the resultant voltage to the first node; and
an output voltage control unit for controlling the first and second regulators in accordance with first information instructing target voltage of the output voltage,wherein in the case where the target voltage instructed by the, first information is larger than a predetermined threshold voltage, the output voltage control unit controls the first regulator so that the voltage of the first node becomes the target voltage and stops supply of voltage from the second regulator and, in the case where the target voltage is smaller than the predetermined threshold voltage, the output voltage control unit controls the second regulator so that the voltage of the first node becomes the target voltage and stops supply of voltage from the first regulator.
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Accused Products
Abstract
The present invention realizes stabler output voltage variable control in a power supply unit. A power supply unit capable of changing dynamic output voltage has: a first regulator for dropping down voltage, by a switching method and outputting the resultant voltage to a first node; and a second regulator for dropping down the input voltage by a voltage drop and outputting the resultant voltage to the first node. In the case where a target voltage instructed by first information is larger than a predetermined threshold voltage, the power supply unit controls so that the voltage of the first node becomes the target voltage and stops supply of voltage from the second regulator. In the case where the target voltage is smaller than the predetermined threshold voltage, the power supply unit controls the second regulator so that the voltage of the first node becomes the target voltage and stops output of voltage from the first regulator.
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Citations
12 Claims
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1. A power supply unit capable of changing dynamic output voltage comprising:
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a first node for outputting the output voltage; a first regulator for dropping, down input voltage by a switching method and outputting the resultant voltage to the first node; a second regulator for dropping down the input voltage by voltage drop and outputting the resultant voltage to the first node; and an output voltage control unit for controlling the first and second regulators in accordance with first information instructing target voltage of the output voltage, wherein in the case where the target voltage instructed by the, first information is larger than a predetermined threshold voltage, the output voltage control unit controls the first regulator so that the voltage of the first node becomes the target voltage and stops supply of voltage from the second regulator and, in the case where the target voltage is smaller than the predetermined threshold voltage, the output voltage control unit controls the second regulator so that the voltage of the first node becomes the target voltage and stops supply of voltage from the first regulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a switching control unit generating a control signal for controlling an on/off state of a switching circuit in a step-down-type switching regulator; a series regulator; and an output voltage control unit controlling the switching control unit and the series regulator in accordance with first information instructing a target voltage to be output, wherein in the case where the target voltage instructed by the first information is larger than a predetermined threshold voltage, the output voltage control unit, generates the control signal so that output voltage of the switching regulator becomes the target voltage and stops supply of voltage from the series regulator, and in the case where the target voltage is smaller than the predetermined threshold voltage, the output voltage control unit generates the control signal to control the series regulator so that output voltage of the series regulator becomes the target voltage and to stop generation of voltage by the switching regulator. - View Dependent Claims (10, 11, 12)
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Specification