Patent ID: 9461166
Filing Date: 2016-10-04
CPC Classification: H01L

Claim Text:
1. A lateral-diffused metal oxide semiconductor device, comprising: a substrate comprising a first deep well having a first conductive type; a second deep well having a second conductive type disposed in the first deep well; a gate disposed on the substrate and the boundary of the first and the second deep well; a source and a drain having a second conductive type disposed beside the gate and in the first deep well and the second deep well respectively; a first dopant region having a first conductive type disposed in the second deep well, wherein the first dopant region comprising dopant regions is separated from the drain and is not directly below the gate; and a third deep well disposed in a portion of the substrate, wherein the third deep well has a dopant concentration gradient, with dopant concentration thereof being higher when further away from the substrate and dopant concentration thereof being lower when closer to the substrate, and the dopant concentration of the third deep well is higher than the dopant concentration of the first deep well and the second deep well respectively.