Patent ID: 6593621
Filing Date: 2003-07-15
Classification: H01L

Abstract:
A lateral DMOS transistor structure comprising:a semiconductor material of a first conductivity type, said semiconductor material having a first dopant concentration and a top surface; a conductive gate overlying and insulated from said top surface of said semiconductor material, said conductive gate having a geometric shape including a rectilinear region and a curved region; a first region formed in said semiconductor material, said first region being of said first conductivity type and having a second dopant concentration to form a drain region of said DMOS transistor; a second region formed in said semiconductor material, said second region being of a second conductivity type and having a third dopant concentration to form a body region of said DMOS transistor, said second region having a first end underlying said conductive gate, any remaining portion of said semiconductor material underlying said conductive gate being in said first conductivity type; a third region formed in said semiconductor material, said third region being of said first conductivity type and having said second dopant concentration to form a source region of said DMOS transistor, said third region being located within said second region; and an oxide region formed in and above said top surface of said semiconductor material, said oxide region having a first end underlying said conductive gate and a second end abutting said first region; wherein said first region is separated from said second region by a first distance in said rectilinear region necessary to achieve a first breakdown voltage, and separated by a second distance in said curved region necessary to achieve at least said first breakdown voltage, said second distance greater than said first distance.