Patent ID: 8653587
Filing Date: 2014-02-18
Classification: H01L

Abstract:
1. A trench MOSFET having a top side drain comprising: a substrate of a first conductivity type; an epitaxial layer of the first conductivity type onto said substrate, wherein said epitaxial layer has a lower doping concentration than said substrate; an active area comprising a plurality of gate trenches filled with gate material, surrounded by a body region of a second conductivity type, and flanked by a source region of the first conductivity type; a top side drain formed in a wide trench in a termination area and comprising a top drain metal connected to said epitaxial layer through a plurality of trenched drain contacts each filled with a contact metal plug, wherein said wide trench is formed simultaneously when said gate trenches are formed in said active area; a BV sustaining area formed in the termination area and adjacent to the top side drain.