Control circuit of boost DC-DC converter, power supply circuit, and electronic device
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United States of America
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Dec 10, 2024
Grant Date -
Dec 22, 2022
app pub date -
Jun 13, 2022
filing date -
Jun 13, 2022
priority date (Note) -
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Abstract
Disclosed is a control circuit of a boost DC-DC converter including a high side transistor and a low side transistor, and a load switch connected between the high side transistor and an output line of the boost DC-DC converter. The control circuit includes a pulse modulator that generates a pulse signal with a pulse modulated to bring an output voltage of the output line close to a target level, a logic circuit that generates a high side control signal and a low side control signal based on the pulse signal, a load switch drive circuit that drives a first PMOS transistor provided as the load switch, and a current detection circuit that generates a current detection signal indicating a current flowing through the first PMOS transistor. The load switch drive circuit is switchable between a first mode and a second mode.
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