Patent ID: 7750398

Claim:
A trenched MOSFET with a trench termination, comprising: a substrate comprising a drain region which is strongly doped and a doping epi layer region, which is weakly doped the same type as the drain region, on the drain region; a plurality of body regions with opposite type doping of said epi layer region served as channel regions disposed in said epi layer region; a plurality of source regions with same type doping as said drain region formed in said body regions; a metal layer comprising a plurality of metal layer regions which are connected to respective said source and body regions, and gate regions forming source metal and gate metal connections of the MOSFET; a plurality of metal contact plugs connected to respective said source and gate metals; a plurality of gate trenches filled with polysilicon to form a plurality of trenched gates in top portion of said epi layer; an insulating layer deposited on said epi layer formed underneath said metal layers with a plurality of metal contact holes therein for contacting respective said source and body regions; a margin terminating gate trench formed in a termination area; a margin terminating trench gate formed along trench sidewall of said margin termination trench; a first margin terminating doping region comprising source and body regions formed along one trench sidewall of said margin terminating trench gate; and a second margin terminating doping region comprising said source and body regions, formed underneath a portion of trench bottom of said margin terminating gate trench near by bottom of another trench sidewall of said margin terminating trench gate.