Semiconductor circuit device and switching regulator
AssigneeSeiko Epson Corporation
InventorYuki Yamamoto
Life of this patent
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Abstract
A semiconductor circuit device includes a current detecting circuit that converts an inductor current into a voltage and outputs the voltage as a current detection voltage, a differential amplifier circuit that amplifies a difference between a voltage corresponding to the output voltage and a reference voltage, a level shifter, and a comparing circuit that compares the current detection voltage with a level-shifted voltage and outputs a switching signal for a switching device. The differential amplifier circuit includes a MOS transistor provided between a power supply node and an output node. The level shifter level-shifts a voltage at the output node of the differential amplifier circuit to a low potential side and outputs the level-shifted voltage.
Claims12
A semiconductor circuit device that is used for a switching regulator that regulates an input voltage using a switching device and an inductor and outputs an output voltage, the semiconductor circuit device comprising:
- a current detecting circuit that converts an inductor current flowing through the inductor into a voltage and outputs the voltage as a current detection voltage;
- a differential amplifier circuit that includes a MOS transistor provided between a power supply node and an output node and amplifies a difference between a voltage corresponding to the output voltage and a reference voltage;
- a level shifter that level-shifts a voltage at the output node of the differential amplifier circuit to a low potential side and outputs the level-shifted voltage;
- and
- a comparing circuit that compares the current detection voltage with the level-shifted voltage and outputs a switching signal for the switching device.
Dependencies are inferred from the claim text.