Patent ID: 7365392

Claim:
A semiconductor device comprising: at least one trench lateral power MOSFET on a semiconductor substrate, comprising a first gate oxide film and first gate electrodes that are positioned in a trench; a first drain region positioned under a bottom surface of the trench; first source regions positioned on both sides of the trench; an extended drain region positioned between the first drain region and the first source regions; a first drain electrode connected electrically to the first drain region; and first source electrodes connected electrically to corresponding first source regions; and at least one planar MOSFET positioned on the semiconductor substrate, comprising a second gate oxide film and a second gate electrode that are positioned on a surface of the semiconductor substrate; a second drain region and a second source region that are positioned in a surface layer of the semiconductor substrate on both sides of the second gate electrode; a second drain electrode connected electrically to the second drain region; and a second source electrode connected electrically to the second source region, wherein the first drain electrode, the first source electrodes, the second drain electrode, and the second source electrode are formed by patterning a same metal layer.