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US 2017/0250606 A1Published application
Switching regulator
AssigneeSii Semiconductor Corporation
InventorsAkihiro KAWANO, Katsuya GOTO
Life of this patent
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Abstract
Provided is a switching regulator configured to suppress noise coupling, which may occur when a comparator is switched between a normal current operation and a low current consumption operation, to thereby operate stably. The switching regulator has a configuration in which switches are connected to input terminals of the comparator, and a feedback resistor having a large resistance value is disconnected from the input terminal of the comparator when switching is performed between the normal current operation and the low current consumption operation.
Claims3
A switching regulator, comprising:
- a feedback resistor for outputting a feedback voltage;
- a reference voltage circuit configured to generate a reference voltage;
- a comparator, which includes a first input terminal connected to an output terminal of the feedback resistor, and a second input terminal connected to an output terminal of the reference voltage circuit, and which is configured to compare the feedback voltage and the reference voltage to each other;
- a light load mode detecting circuit configured to detect a light load mode;
- a first switch arranged between the output terminal of the feedback resistor and the first input terminal;
- and
- a second switch arranged between the first input terminal and the second input terminal,
- the switching regulator being configured to control, based on a signal output from the comparator, a power FET connected between a voltage input terminal and an output terminal, to thereby output a desired voltage,
- the first switch being turned off and the second switch being turned on when the comparator switches an operation current based on a detection signal from the light load mode detecting circuit.
6 more elements
Dependencies are inferred from the claim text.