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Shared bootstrap capacitor for multiple phase buck converter circuit and methods

  • US 9,419,509 B2
  • Filed: 08/11/2014
  • Issued: 08/16/2016
  • Est. Priority Date: 08/11/2014
  • Status: Active Grant
First Claim
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1. A buck converter for producing a DC output voltage from a DC input voltage, comprising:

  • a plurality of n switching stages, wherein n is an integer greater than or equal to two, each coupled to a corresponding switching node, each of the n switching stages further comprising;

    a high side MOS switch coupled between an input terminal for a positive input voltage and the corresponding switching node;

    an inductor corresponding to each of the n switching stages coupled in parallel to each other and coupled between the corresponding switching node and an output terminal and configured for providing the DC output voltage; and

    high side driver circuitry configured to selectively couple a shared bootstrap capacitor to a gate terminal of a respective one of the high side MOS switches within each of the n switching stages, wherein the bootstrap capacitor is configured to charge a gate capacitance of the respective one of the high side MOS switches.

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