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Synchronous buck converter using shielded gate field effect transistors

  • US 8,193,570 B2
  • Filed: 07/29/2010
  • Issued: 06/05/2012
  • Est. Priority Date: 01/05/2006
  • Status: Active Grant
First Claim
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1. A synchronous buck converter comprising:

  • a high-side switch and a low-side switch serially coupled to one another, wherein the low-side switch includes a field effect transistor which comprises;

    a trench extending into a drift region of the field effect transistor;

    a shield electrode in a lower portion of the trench, wherein the shield electrode is insulated from the drift region by a shield dielectric;

    a gate electrode in the trench over the shield electrode, wherein the gate electrode is insulated from the shield electrode by an inter-electrode dielectric;

    source regions adjacent the trench;

    a source metal contacting the source regions; and

    a resistive element having one end contacting the shield electrode and another end contacting the source metal in the field effect transistor.

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