Patent ID: 7456470

Claim:
A top drain MOSgated device, comprising a semiconductor die having a top and bottom surface comprising a substrate of a first conductivity type extending from said bottom surface; a first region of said first conductivity type over said substrate, a region of a second conductivity type over said first region of said first conductivity type; a channel region of said second conductivity type atop said region of said second conductivity type, said channel region being less conductive than said region of said second conductivity type; a drift region of said first conductivity type atop said channel region; a plurality of parallel spaced gate trenches extending from said top surface through said drift region, said channel region, said region of said second conductivity type and said first region of said first conductivity type; a second region of said first conductivity type formed adjacent each said gate trench and inside said region of said second conductivity type spaced from said first region by a portion of said region of said second conductivity type, a third region of said first conductivity type formed partially in said region of said second conductivity type and extending from said second region into said channel region; the bottom of each of said gate trenches having a conductive silicide short electrically connecting said substrate to said first region of said first conductivity type, said region of said second conductivity type, and said second region of said first conductivity type; a bottom insulating mass in the bottom of each of said gate trenches; a gate oxide liner lining the walls of each of said gate trenches adjacent at least a portion of a depth of said channel region; a conductive gate mass within each of said gate trenches and bounded on its bottom by said bottom insulating mass and at its sides by said gate oxide liner; a top insulation mass substantially filling a top of each of said gate trenches above the top of each of said conductive gate masses; and a top drain electrode disposed on said top surface and in contact with said drift region between said gate trenches; and a bottom source electrode connected to said bottom surface.