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Bidirectional blocking accumulation-mode trench power MOSFET

  • US 5,661,322 A
  • Filed: 06/02/1995
  • Issued: 08/26/1997
  • Est. Priority Date: 06/02/1995
  • Status: Expired due to Term
First Claim
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1. An accumulation-mode MOSFET comprising:

  • a semiconductor chip;

    a gate formed in a trench at a surface of said semiconductor chip and separated from said semiconductor chip by an insulating layer, said trench defining a cell of said MOSFET, a first region of said semiconductor chip being located within said cell and containing semiconductor material of a first conductivity type, said cell being designed such that a substantial portion of said first region is depleted thereby preventing the flow of current through said first region when said gate is held at a predetermined voltage;

    a second region of said first conductivity type located under said trench;

    a third region of a second conductivity type adjacent said second region, a junction between said second and third regions forming a first diode; and

    a fourth region of said first conductivity type adjacent said third region, a junction between said third and fourth regions forming a second diode, wherein said fourth region is connected to said gate.

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