Patent ID: 7831851
Filing Date: 2010-11-09
Classification: H02M,Y02B

Abstract:
1. A switching regulator converting an input voltage into a predetermined constant voltage and outputting the constant voltage from an output terminal, the switching regulator comprising: a switching transistor controlling output of the input voltage by switching in accordance with a control signal input to a control electrode; a smoothing circuit part configured to smooth an output voltage of the switching transistor and output the smoothed output voltage to the output terminal; a control circuit part configured to control the switching of the switching transistor in synchronization with an externally input clock signal so that a voltage at the output terminal is the predetermined constant voltage; and a clock signal detector circuit part configured to detect presence or absence of inputting of the clock signal, the clock signal detector circuit part comprising: wherein upon detecting stoppage of the inputting of the clock signal, the clock signal detector circuit part causes the control circuit part to stop operating and perform a standby operation for reducing power consumption and thereby to turn off the switching transistor, and wherein the switching transistor, the control circuit part, and the clock signal detector circuit part are integrated into a single IC.