Patent ID: 7915674

Claim:
A lateral diffused metal oxide semiconductor device, comprising: a first-type substrate; a gate oxide film disposed on the first-type substrate; a poly gate disposed on the gate oxide film; a first second-type slightly doped region formed in the first-type substrate and acting as a well; a first first-type highly doped region formed in the well and acting as a body; a first second-type highly doped region formed in the body and acting as a source; a second second-type highly doped region formed in the well and acting as a drain; a second first-type highly doped region formed in the body; and a first first-type doped region formed in the body and is beneath the source; wherein the source and the drain are disposed at two sides of the poly gate, the second first-type highly doped region is adjacent to the source, parts of the body and the well are directly beneath the poly gate to isolate the source from the drain, the first first-type doped region is independent from the second first-type highly doped region, the lateral diffused metal oxide semiconductor device further comprising a second first-type doped region formed in the body, beneath the second first-type highly doped region, and a clearance is defined between the second first-type doped region and the first first-type doped region.