Patent ID: 7477048

Claim:
A chopper type boosting switching regulator, comprising: a first transistor disposed between another end of a coil having one end connected to an input terminal and an output terminal to output an output voltage from the output terminal; a second transistor disposed between the another end of the coil and a ground; a voltage divider circuit disposed between the output terminal and the ground; a first buffer that drives the first transistor so as to hold the output voltage of the output terminal at a constant voltage on the basis of an output voltage from the voltage divider circuit; a second buffer that drives the second transistor so as to hold the output voltage of the output terminal at the constant voltage on the basis of the output voltage from the voltage divider circuit; a comparator circuit that compares an input voltage of the input terminal with the output voltage of the output terminal; a first switch that supplies a higher voltage of the input voltage of the input terminal and the output voltage of the output terminal to the first buffer as a supply voltage on the basis of a comparison result of the comparator circuit; a second switch that supplies the higher voltage to the second buffer as the supply voltage on the basis of the comparison result of the comparator circuit; and a third switch that connects a back gate of the first transistor to one of the another end of the coil and the output terminal.