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Method and circuit for reducing losses in DC-DC converters

  • US 6,930,473 B2
  • Filed: 08/16/2002
  • Issued: 08/16/2005
  • Est. Priority Date: 08/23/2001
  • Status: Expired due to Term
First Claim
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1. A circuit comprising:

  • a first switch having first and second transistors being parallel-connected between first and second terminals, the second transistor being larger in size than the first transistor; and

    a controller block coupled to the first switch such that;

    if a first current to be transferred through the first switch is greater than a predetermined amount the controller block turns on the first switch by;

    (i) turning on the first transistor so that a voltage level at the second terminal starts moving towards a predetermined voltage level at the first terminal, and (ii) turning on the second transistor after the voltage level at the second terminal reaches a voltage level substantially equal to the predetermined voltage level, and if the first current is less than the predetermined amount, the controller block turns on the first switch by turning on the first transistor and maintaining the second transistor in the off state so that the first current is transferred only through the first transistor.

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