Patent ID: 8076915

Claim:
A switching converter comprising: an A-coil connected to an output terminal; a first A-switch switching electric power outputted via the A-coil; a second A-switch rectifying the electric power to become direct current thereby the second A-switch becomes set to an ON-state alternately with the first A-switch; an A-driving unit driving the first A-switch and the second A-switch alternately; a B-coil connected in series to the A-coil; a first B-switch switching the electric power outputted via the B-coil and the A-coil; a second B-switch rectifying the electric power to become direct current thereby the second B-switch becomes set to an ON-state alternately with the first B-switch; a B-driving unit driving the first B-switch and the second B-switch alternately; and a selection unit causing the A-driving unit and the B-driving unit to drive selectively, wherein the A-driving unit is set to have a larger capacity than the B-driving unit, and the selection unit drives the A-driving unit when the output load is higher than a predetermined value and drives the B-driving unit when the output load is equal to or lower than the predetermined value.