Patent ID: 7276419

Claim:
A method for constructing a semiconductor device comprising: forming a buried layer in a semiconductor substrate having a first dopant type, the buried layer having a second dopant type; forming an epitaxial semiconductor layer over the buried layer, the epitaxial semiconductor layer having the first dopant type; forming a first semiconductor region in the epitaxial semiconductor layer, the first semiconductor region having the second dopant type, a second semiconductor region being defined in the epitaxial semiconductor layer between the first semiconductor region and the buried layer, the second semiconductor region having the first dopant type; forming a third semiconductor region in the epitaxial semiconductor layer, the third semiconductor region having the first dopant type; forming a gate electrode over at least a portion of the first semiconductor region and over at least a portion of the third semiconductor region; forming a fourth semiconductor region in the epitaxial semiconductor layer adjacent to the third semiconductor region and adjacent to the gate electrode, the fourth semiconductor region having a first concentration of the second dopant type; forming a source contact region in the epitaxial semiconductor layer adjacent to the third semiconductor region and adjacent to and on a side of the fourth semiconductor region opposing the gate electrode, the source contact region having a second concentration of the second dopant type, the second concentration being higher than the first concentration; forming a drain contact region in the epitaxial semiconductor layer adjacent to the first semiconductor region, the drain contact region having the second dopant type; and forming a body contact region in the epitaxial semiconductor layer adjacent to the third semiconductor substrate, the body contact region having the first dopant type.