SWITCHING REGULATOR

摘要

In a switching regulator, a first switch and a second switch are turned ON and OFF complementarily according to an output voltage. In a step-up/down mode, a third switch and a fourth switch are turned ON and OFF complementarily while the ON-duty D of the third switch is kept fixed.

主权项

1. A switching regulator for generating an output voltage from an input voltage, the switching regulator comprising:
a first switch of which a first end is connected to a first application terminal to which the input voltage is applied; a second switch of which a first end is connected to a second end of the first switch and of which a second end is connected to a second application terminal to which a predetermined voltage lower than the input voltage is applied; an inductor of which a first end is connected to a connection node between the first and second switches; a third switch of which a first end is connected to a second end of the inductor and of which a second end is connected to the second application terminal; a fourth switch of which a first end is connected to a connection node between the inductor and the third switch and of which a second end is connected to a third application terminal to which the output voltage is applied; a first control circuit that generates a step-down control signal for complementarily turning ON and OFF the first and second switches according to the output voltage; and a second control circuit that generates a step-up control signal for complementarily turning ON and OFF the third and fourth switches while keeping an ON-duty D (0