Patent ID: 8159025

Claim:
A trench-typed power MOS transistor, comprising: a drain region having a first conductivity type property and connected to a drain electrode; a double diffusion doping region having the first conductivity type property and disposed under the drain region; a trench-typed gate region having a gate conductor and an insulating layer, wherein the insulating layer extends into the double diffusion doping region to insulate the gate conductor; a source region having the first conductivity type property and connected to a source electrode; a well region having a second conductivity type property and disposed under the source region; a deep well region having the first conductivity type property and disposed under the double diffusion doping region and the well region; and a substrate region disposed under the deep well region; wherein the insulating layer forms a thin sidewall region between the gate conductor and the well region, a thick sidewall region between the gate conductor and the double diffusion doping region, and a thick bottom region between the gate conductor and the deep well region, and the drain electrode and the source electrode are disposed on the top surface of the trench-typed power MOS transistor.