Edge termination for super-junction MOSFETs
First Claim
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1. A vertical trench MOSFET comprising:
- a substrate of first conductivity;
a plurality of gate trenches descending beneath a surface of said substrate,wherein each gate trench comprises one or more gates of said MOSFET;
source and body regions of said MOSFET in a mesa between said gate trenches;
a drift region below said gate trenches and below said source and body regions, said drift region comprising;
a plurality of core plates of a second conductivity alternating with regions of said first conductivity, wherein said core plates are coupled to said source regions of said MOSFET;
a termination region surrounding said drift region at about the same depth as said drift region, said termination region comprising;
a plurality of separated floating termination segments of said second conductivity formed in said substrate, separated from one another by regions of said first conductivity,wherein there are no gates of said MOSFET above said termination region, andwherein each of said termination segments has a length dimension not greater than a length dimension of said core plates.
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Abstract
Edge termination for super-junction MOSFETs. In accordance with an embodiment of the present invention, a super-junction metal oxide semiconductor field effect transistor (MOSFET) includes a core super-junction region including a plurality of parallel core plates coupled to a source terminal of the super-junction MOSFET. The super-junction MOSFET also includes a termination region surrounding the core super-junction region comprising a plurality of separated floating termination segments configured to force breakdown into the core super-junction region and not in the termination region. Each termination segment has a length dimension less than a length dimension of the core plates.
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6 Claims
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1. A vertical trench MOSFET comprising:
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a substrate of first conductivity; a plurality of gate trenches descending beneath a surface of said substrate, wherein each gate trench comprises one or more gates of said MOSFET; source and body regions of said MOSFET in a mesa between said gate trenches; a drift region below said gate trenches and below said source and body regions, said drift region comprising; a plurality of core plates of a second conductivity alternating with regions of said first conductivity, wherein said core plates are coupled to said source regions of said MOSFET; a termination region surrounding said drift region at about the same depth as said drift region, said termination region comprising; a plurality of separated floating termination segments of said second conductivity formed in said substrate, separated from one another by regions of said first conductivity, wherein there are no gates of said MOSFET above said termination region, and wherein each of said termination segments has a length dimension not greater than a length dimension of said core plates. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification