Patent ID: 8587058

Claim:
A lateral diffused metal-oxide-semiconductor (LDMOS) device, comprising: a substrate; a first doped region, disposed in the substrate, and having a first conductive type; a second doped region, disposed in the first doped region, and having a second conductive type, wherein the second doped region has a racetrack-shaped outline, the second doped region has a long axis and a short axis, and the second doped region has a straight portion, disposed at an end of the short axis; a third doped region, disposed in the second doped region, and having the first conductive type; a fourth doped region, disposed in the first doped region, and having the first conductive type, wherein the fourth doped region is disposed in the first doped region at a side of the second doped region extending out along the short axis, and a width of the fourth doped region in a direction parallel with the long axis is larger than or equal to a width of the straight portion in the direction parallel with the long axis; a gate structure, disposed on the first doped region and the second doped region between the third doped region and the fourth doped region; and a contact metal, disposed on the first doped region at a side of the second doped region extending out along the long axis, and being in contact with the first doped region.