Patent ID: 8569765
Filing Date: 2013-10-29
Classification: H01L

Abstract:
1. An integrated circuit comprising: a substrate of a first conductivity type; an epitaxial layer of said first conductivity type over said substrate, said epitaxial layer having a lower doping concentration than said substrate; a trench MOSFET comprising a plurality of trenched gates surrounded by a source region of said first conductivity type encompassed in a body region of a second conductivity type; each said trenched gate comprising a conductive material padded by a gate oxide layer filled in a gate trench, wherein said gate oxide layer having a thick bottom oxide on bottom surface of said gate trench with a thickness greater than sidewall oxide along sidewall of said gate trench; a Schottky rectifier extending into said epitaxial layer and having a Schottky barrier layer lined in a trenched anode contact filled with a contact metal plug; a Gate-Drain clamp diode comprising multiple back to back poly-silicon Zener diodes with alternating doped regions of said first conductivity type next to said second conductivity type, connected with a gate metal on one side, and with a drain metal on another side through a plurality of metal stripes cross over a termination area; and a Gate-Source clamp diode comprising multiple back to back poly-silicon Zener diodes with alternating doped regions of said first conductivity type next to said second conductivity type, connected with said gate metal on one side, and with a source metal on another side.