Patent ID: 8785969

Claim:
A lateral diffused metal oxide semiconductor (LDMOS) device, comprising: a substrate of a first conductivity type; an epitaxial layer of a second conductivity type, disposed on the substrate; a well region of the first conductivity type, disposed in the epitaxial layer; a deep well region of the second conductivity type, disposed in the epitaxial layer; a source region of the second conductivity type, disposed in the well region; a drain region of the second conductivity type, disposed in the deep well region; an isolation structure, disposed on the deep well region; a gate, disposed on the epitaxial layer between the drain region and the source region and extending to above a portion of the isolation structure; at least one trench insulating structure, disposed in the deep well region below the isolation structure; and at least one doped region of the first conductivity type, disposed in the deep well region and surrounding a sidewall and a bottom of the trench insulating structure.