Patent ID: 6548860
Filing Date: 2003-04-15
Classification: H01L

Abstract:
A trench DMOS transistor structure that includes at least three individual trench DMOS transistor cells formed on a substrate of a first conductivity type, said plurality of individual DMOS transistor cells being dividable into peripheral transistor cells and interior transistor cells, each of said individual transistor cells comprising:body region on the substrate, said body region having a second conductivity type; at least one trench extending through the body region and the substrate; an insulating layer that lines the trench; a conductive electrode in the trench overlying the insulating layer; and wherein said interior transistor cells but not said peripheral transistor cells each further include a source region of the first conductivity type in the body region adjacent to the trench, and further wherein the body regions of said peripheral transistor cells are more lightly doped than the body regions of said interior transistor cells.