Patent ID: 7906951

Claim:
A switching regulator, comprising: first and second transistors which are provided in series between power sources respectively having first and second potentials, and which convert a direct current voltage of a potential difference between the first and the second potentials into an alternating current voltage; and a control circuit including: a comparator which compares the alternating current voltage and a threshold voltage in a period when the second transistor is to be on, and receives a predetermined voltage different from the alternating current voltage, at least immediately before the period in which the second transistor is to be on, the predetermined voltage being farther than a midpoint potential of the first and second potentials from the threshold voltage, wherein the control circuit performs control such that the second transistor becomes turned off, when the comparator judges that the alternating current voltage has exceeded the threshold voltage toward the midpoint potential direction, the control circuit switches to apply from the alternating current voltage to the predetermined voltage into the comparator, and then performs control such that the switched state is maintained until immediately before the period in which the second transistor is to be on.