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Buck-boost regulator

  • US 8,018,212 B1
  • Filed: 06/06/2008
  • Issued: 09/13/2011
  • Est. Priority Date: 08/24/2007
  • Status: Active Grant
First Claim
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1. A buck-boost regulator for converting an input voltage to an output voltage, comprising:

  • an inductor having a first end and a second end;

    an error circuit which determines an error of the output voltage and which provides an error voltage indicative thereof;

    a buck switching circuit which switches said first end of said inductor between the input voltage and ground as controlled by a buck pulse width modulation signal;

    a buck ripple circuit which replicates ripple current through said inductor based on said buck pulse width modulation signal and which provides a buck ripple voltage indicative thereof;

    a buck hysteretic comparator circuit which develops said buck pulse width modulation signal based on comparing said buck ripple voltage within a buck window voltage range between said error voltage and said error voltage combined with a buck window voltage;

    a boost switching circuit which switches said second end of said inductor between the output voltage and ground as controlled by a boost pulse width modulation signal;

    a boost ripple circuit which replicates ripple current through said inductor based on said boost pulse width modulation signal and which provides a boost ripple voltage indicative thereof; and

    a boost hysteretic comparator circuit which develops said boost pulse width modulation signal based on comparing said boost ripple voltage within a boost window voltage range between said error voltage and said error voltage combined with a boost window voltage.

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