Patent ID: 8519689
Filing Date: 2013-08-27
Classification: H02M,Y02B

Abstract:
1. A switching regulator comprising: an input terminal to which an input voltage is input; an output terminal via which an output voltage obtained by converting the input voltage into a predetermined voltage by an operation of the switching regulator is output, wherein the operation of the switching regulator is stopped by an enable signal in a standby status; a switching transistor configured to perform switching in accordance with a control signal input to the switching transistor; an inductor configured to be charged with the input voltage by the switching of the switching transistor; a rectifying transistor including a bipolar transistor configured to discharge the inductor when the switching transistor is turned off and the charging of the inductor is stopped; a control circuit unit configured to control the switching of the switching transistor such that a voltage proportional to the output voltage becomes equal to a reference voltage; and a rectifying transistor control circuit unit configured to control an operation of the rectifying transistor in accordance with the enable signal, wherein the rectifying transistor control circuit unit turns off the rectifying transistor and places the rectifying transistor in a cut-off state upon reception of the enable signal indicating the standby status, and wherein, upon reception of the enable signal indicating a normal operation, the rectifying transistor control circuit unit connects a base and a collector of the rectifying transistor so that a diode is formed.