Patent ID: 7737668

Claim:
A switching regulator, comprising: an input terminal configured to receive an input voltage (V IN ); an output terminal configured to output an output voltage (V OUT ); a common line; a first switch having a first terminal connected to said input terminal and a second terminal; a first diode having a cathode connected to said second terminal of said first switch and an anode connected to said common line; an inductor having a first terminal connected to said second terminal of said first switch and said cathode of said first diode and a second terminal; a second switch having a first terminal connected to said second terminal of said inductor and a second terminal connected to said common line; a second diode having an anode connected to said second terminal of said inductor and said first terminal of said second switch and a cathode connected to said output terminal; a controller for controlling a first duty ratio (D1) of said first switch, a second duty ratio (D2) of said second switch, said first switch and said second switch, said controller being configured to receive a current signal indicative of an inductor current flowing in said inductor, and generating a signal indicative of an average current flowing in said inductor, said average current being utilized to control said first switch and said second switch, and a current selector configured to select either a current flowing in said first switch or a current flowing in said second diode and to output a selected signal indicative of said selected current as a current signal indicative of said inductor current flowing in said inductor.