A boost DC/DC converter has a voltage dividing circuit connected between the output terminal and the ground, that outputs a divided voltage obtained by dividing the output voltage; a reference voltage generating circuit that generates a reference voltage based on the input voltage; an error amplifier that outputs a first signal corresponding to the difference between the divided voltage and the reference voltage; a feedforward circuit that detects the input voltage and outputs a second signal corresponding to a current inversely proportional to the input voltage; a multiplier that multiples the first signal by the second signal and outputs a third signal obtained; and a control circuit that outputs, based on the third signal, a control signal for controlling on/off of the switching transistor so that the divided voltage is equal to the reference voltage.
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