Patent ID: 7852056

Claim:
A switching regulator, comprising: an inductor; a first switch connected between an input terminal and one terminal of the inductor, and configured to switch to create a conduction state or a shutdown state in accordance with a first control signal; a second switch connected between another terminal of the inductor and ground, and configured to switch to create a conduction state or a shutdown state in accordance with a second control signal; a first rectifier to allow current flowing from a negative Voltage output terminal to a connection node between the inductor and the first switch; a second rectifier to allow current flowing from a positive voltage output terminal to a connection node between the inductor and the second switch; a third switch connected between a connection node between the inductor and the first switch and ground, and configured to switch to create a conduction state or a shutdown state in accordance with a third control signal; a first capacitor connected between the negative voltage output terminal and ground; second capacitor connected between the positive voltage output terminal and ground; and a controller configured to control a switching operation of the first, second and third switches to make each voltage at the negative and positive voltage output terminals corresponding predetermined voltages, respectively, wherein the control circuit switches the first and second switches on and off simultaneously to make a sum of absolute values of both voltages at the negative and positive voltage output terminals a predetermined voltage value.