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Cascode configured switching using at least one low breakdown voltage internal, integrated circuit switch to control at least one high breakdown voltage external switch

  • US 8,248,145 B2
  • Filed: 06/30/2009
  • Issued: 08/21/2012
  • Est. Priority Date: 06/30/2009
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an integrated circuit controller to at least control a switching power converter, wherein the controller is configured to control the switching power converter by generating a switch control signal to control a first switch, wherein the first switch is internal to the controller, the integrated circuit includes a node to couple the first switch to a second switch in a cascode configuration, a breakdown voltage of the first voltage switch is approximately less than or equal to one-half of a breakdown voltage of the second switch;

    a first node to couple to a voltage supply; and

    a second node to couple to the first switch and the second switch; and

    a charge recovery circuit coupled between the first node and the second node to provide charge recovery to the voltage supply during at least a portion of a time when the control signal turns the first switch off.

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