Patent ID: 7427795

Claim:
A high-side drain-extended MOS transistor, comprising: an n-doped source of the high-side drain-extended MOS transistor that is formed in a semiconductor body; an n-doped drain of the high-side drain-extended MOS transistor that is laterally spaced from the source in the semiconductor body; an n-doped drift region located between the drain and the source in the semiconductor body; a p-doped channel region extending between the drift region and the source in the semiconductor body, wherein the drift region extends between the channel region and the drain; a gate of the high-side drain-extended MOS transistor that is located above the channel region; a p-doped buried layer located below the source, the drain, the channel region, the drift region, and a back gate of the high-side drain-extended MOS transistor, wherein the p-doped buried layer is not electrically coupled to the back gate or the p-doped channel region; and an n-doped buried layer located below at least a portion of the p-doped buried layer.