Patent ID: 7045857

Claim:
A semiconductor die containing an MIS device, said die comprising a first layer of a first conductivity type overlying a second layer of a second conductivity type opposite to said first conductivity type, said die further comprising: an active area comprising an MIS device, said MIS device comprising: an active trench comprising a conductive gate material and extending downward from a surface of said first layer, a bottom of said active trench being located in said first layer; a source region of said second conductivity type in said first layer, said source region being located adjacent said surface of said die and a sidewall of said active trench; and a drain-drift region of said second conductivity type extending downward from said bottom of said active trench to said second layer; and a termination region comprising: at least a first and a second termination trench, each of said termination trenches extending downward from said surface of said die, each of said termination trenches comprising a conductive material and having a bottom in said first layer, said conductive material in each of said termination trenches being insulated from said first layer by a dielectric layer lining the sidewalls and bottom of said termination trench; a region of said second conductivity type extending from a bottom of each of said termination trenches to said second layer; at least a first and a second metal layer above said surface of said die, said first metal layer being electrically connected to said conductive material in said first termination trench and to a portion of said first layer in a mesa between said first and second trenches, said second metal layer being electrically connected to said conductive material in said second termination trench and to a portion of said first layer in a region on a side of said second termination trench opposite from said mesa, wherein said conductive materials in said termination trenches are electrically isolated from each other and from said source region and said first layer.