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Switch-mode regulator including hysteretic control

  • US 8,618,779 B2
  • Filed: 11/15/2010
  • Issued: 12/31/2013
  • Est. Priority Date: 11/24/2009
  • Status: Active Grant
First Claim
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1. A regulator circuit, comprising:

  • a first switch configured to controllably connect a first voltage to an inductor;

    a second switch configured to controllably connect a second voltage to the inductor;

    a switch control circuit configured to control the first and second switches using a timer circuit;

    wherein the switch control circuit is configured to turn off the first switch and to turn on the second switch for a duration proportional to a difference between the first voltage and a third voltage, divided by the first voltage;

    wherein the switch control circuit is configured to turn on the first switch and to turn off the second switch for a duration proportional to the third voltage divided by the first voltage;

    wherein one of the first or third voltages corresponds to a desired output voltage;

    wherein the second voltage is less than the first and third voltages; and

    wherein the switch control circuit includes at least one of a peak threshold control circuit and a valley threshold control circuit and wherein the switch cycling period is adjustable using the at least one of the peak threshold control circuit and the valley threshold control circuit.

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