Patent ID: 8680616

Claim:
A semiconductor device, comprising: a first drift region having a first doping polarity formed in a substrate; a doped extension region formed in the first drift region and having a second doping polarity opposite the first doping polarity, the doped extension region including a laterally-extending component; a dielectric structure formed over the first drift region, the dielectric structure being separated from the doped extension region by a portion of the first drift region; a gate structure formed over a portion of the dielectric structure and a portion of the doped extension region; a doped isolation region having the second doping polarity, the doped isolation region at least partially surrounding the first drift region and the doped extension region; a high voltage region that is located outside the first drift region and the doped extension region but borders the doped isolation region, the high voltage region having the first doping polarity and being more doped than the first drift region; and a second drift region that at least partially surrounds the high voltage region from a top view, the second drift region having the first doping polarity and being less doped than the first drift region.