| 摘要 |
A switching regulator is disclosed that includes a switching transistor; an inductor; a voltage comparator circuit part comparing a voltage at the connection of the switching transistor and the inductor and a predetermined voltage and outputting a first signal; a phase comparator circuit part comparing the phases of a control signal input to the switching transistor and the output first signal and outputting a second signal; and a control circuit part performing PWM control or PFM/VFM control on the switching transistor in accordance with the output second signal so that a predetermined constant voltage is output from the switching regulator. The control circuit part performs PWM control if the output second signal indicates that the control signal and the output first signal are in phase, and performs PFM/VFM control if the output second signal indicates that the control signal and the output first signal are out of phase.
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