Patent ID: 7759731

Claim:
A lateral trench MOSFET comprising: a semiconductor substrate; a trench formed in the substrate, the trench being lined with a first dielectric layer and containing a conductive material, the first dielectric layer electrically insulating the conductive material from the substrate, the trench comprising an LTDMOS segment and a gate bus segment; a body region of a first conductivity type abutting a sidewall of the LTDMOS segment of the trench; a source region of second conductivity type positioned at a top surface of the substrate and adjoining the body region; a drift region of the second conductivity type adjoining the body region and the sidewall of the LTDMOS segment of the trench; a drain region of the second conductivity type adjoining the drift region and being positioned at the surface of the substrate at a location laterally spaced apart from the source region; a second dielectric layer disposed above a top surface of the substrate, a contact hole being formed in the second dielectric layer over the gate bus segment of the trench; and a gate metal layer above the second dielectric layer, the gate metal layer being in electrical contact with the conductive material in the gate bus segment of the trench via the contact hole.