Patent ID: 8907419

Claim:
A laterally double diffused metal oxide semiconductor device comprising: a first well region having a first conductivity type; a first doped buried semiconductor region having the first conductivity type, wherein the first doped buried semiconductor region is under the first well region but is not in physical contact with the first well region, and the first doped buried semiconductor well is capable of redistributing carriers in the first well region; a buried layer under the first doped buried semiconductor well region, wherein the buried layer has the first conductivity type, the buried layer is doped at a concentration greater than that of the first well region and greater than that of the first doped buried semiconductor region, and the buried layer is electrically tied to the first well region; and an epitaxial layer having a second conductivity type, wherein the epitaxial layer is adjacent to at least a portion of the first doped buried semiconductor region, the second conductivity type is different in type than the first conductivity type, and the epitaxial layer completely surrounds the first doped buried semiconductor region; a drain contact region within the first well region wherein the drain contact region has the first conductivity type and is highly doped at a concentration greater than that of the first well region a second doped buried semiconductor region having the first conductivity type, wherein: the second doped buried semiconductor region is under the first well region but is not in physical contact with the first well region; and the second doped buried semiconductor region is capable of redistributing carriers in the first well region.