Patent ID: 9455332
Filing Date: 2016-09-27
CPC Classification: H01L

Claim Text:
1. A laterally diffused metal oxide semiconductor (LDMOS) transistor comprising: a semiconductor material; a drain drift region that lies within the semiconductor material, the drain drift region having a first conductivity type, a first horizontal dopant concentration peak at a first depth and a second horizontal dopant concentration peak at a second depth, the first depth being measured a distance down from a top surface of the semiconductor material, the second depth being measured a distance down from the first depth; a back gate region that lies within the semiconductor material to touch the drain drift region, the back gate region having a second conductivity type, a third horizontal dopant concentration peak at a third depth, a fourth horizontal dopant concentration peak at a fourth depth, and a fifth horizontal dopant concentration peak at a fifth depth and extending horizontally under the drain drift region, the third depth being measured a distance down from the top surface of the semiconductor material, the fourth depth being measured a distance down from the third depth, and the fifth depth being measured a distance down from the fourth depth; a gate dielectric layer that touches the top surface of the semiconductor material; and a gate that touches and lies over the gate dielectric layer directly over the drain drift region and the back gate region.