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Buck-boost switching regulator

  • US 7,737,668 B2
  • Filed: 09/07/2007
  • Issued: 06/15/2010
  • Est. Priority Date: 09/07/2007
  • Status: Expired due to Fees
First Claim
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1. A switching regulator, comprising:

  • an input terminal configured to receive an input voltage (VIN);

    an output terminal configured to output an output voltage (VOUT);

    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, anda 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.

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