Boost DC-DC converter and semiconductor device having boost DC-DC converter
First Claim
1. A semiconductor device, comprising:
- an input power supply configured to supply input power;
a booster circuit configured to boost the input power supplied from the input power supply, the booster circuit having an input terminal that receives the input power from the input power supply, a power receiving terminal that receives operation power for operating the booster circuit, and an output terminal that outputs the boosted input power to a load;
a switching device connected between the input power supply and the power receiving terminal of the booster circuit and configured to switch the operation power received by the power receiving terminal between the input power from the input power supply and the boosted input power from the output terminal; and
a voltage detection circuit responsive to a voltage change of the operation power at the power receiving terminal of the booster circuit to control the switching device to select between the input power from the input power supply and the boosted input power from the output terminal.
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Accused Products
Abstract
Provided is a boost DC-DC converter where electric power to be supplied to a booster circuit is supplied from a power supply and from boosted electric power of the booster circuit which can be actuated at a low voltage. The boost DC-DC converter has a structure in which: a switching device is provided between the power supply and a boosted output of the booster circuit; a storage capacitor for storing electric power to be inputted to the booster circuit and for operating the booster circuit for a predetermined length of time using the stored electric power is additionally provided; and in a case where the booster circuit can generate boosted electric power even when the switching device is turned off, the switching device is turned off.
121 Citations
14 Claims
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1. A semiconductor device, comprising:
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an input power supply configured to supply input power; a booster circuit configured to boost the input power supplied from the input power supply, the booster circuit having an input terminal that receives the input power from the input power supply, a power receiving terminal that receives operation power for operating the booster circuit, and an output terminal that outputs the boosted input power to a load; a switching device connected between the input power supply and the power receiving terminal of the booster circuit and configured to switch the operation power received by the power receiving terminal between the input power from the input power supply and the boosted input power from the output terminal; and a voltage detection circuit responsive to a voltage change of the operation power at the power receiving terminal of the booster circuit to control the switching device to select between the input power from the input power supply and the boosted input power from the output terminal. - View Dependent Claims (2, 3, 4, 5, 11, 12)
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6. A semiconductor device, comprising:
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an input power supply configured to supply input power; a booster circuit configured to boost the input power from the input power supply, the booster circuit having an input terminal that receives the input power form the input power supply, a power receiving terminal that receives operation power for operating the booster circuit, an output terminal that outputs a boosted input power to a load, and a clock output terminal that outputs a clock signal at a frequency variable according to an operation condition of the booster circuit; a switching device connected between the input power supply and the power receiving terminal of the booster circuit and configured to switch the operation power received by the power receiving terminal between the input power from the input power supply and the boosted input power from the output terminal; and a clock detection circuit responsive to a frequency change of the clock signal from the clock output terminal to control the switching device to select between the input power from the input power supply and the boosted input power from the output terminal. - View Dependent Claims (7, 8, 9, 10, 13, 14)
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Specification