Patent ID: 8004036

Claim:
An integrated circuit compromises trench MOSFET, Schottky rectifier, Gate-Drain and Gate-Source clamp diodes with trench contact structure for device shrinkage and performance improvement on single chip wherein: a substrate of the first conductivity type; an epitaxial layer of said first conductivity type over said substrate, said epitaxial layer having a lower doping than said substrate; a trench MOSFET comprising a trenched gate surrounded by a source region of said first conductivity type encompassed in a body region of second conductivity type above a drain region disposed on a bottom surface of a substrate; a gate oxide lining said trenches; a doped polysilicon within said trenches and overlying said gate oxide; a Schottky rectifier extending into said epitaxial layer and having a Schottky barrier layer lined in trench contacts filled with contact metal plug; a Gate-Drain clamp diode compromises a plurality of back to back polysilicon zener diode with dopant ions of a first conductivity type next to a second conductivity type, connected with gate on one side, and drain on another side through a plurality of metal stripes cross over termination area; a Gate-Source Clamp diode compromises a plurality of back to back polysilicon zener diode with dopant ions of a first conductivity type next to a second conductivity type, connected with gate on one side, and source on another side.