Patent ID: 8853738

Claim:
A power LDMOS device, comprising: a substrate, having a finger tip area, a finger body area and a palm area; a plurality of source regions each having a stripe shape, disposed in the substrate in the finger body area and further extending into the substrate in the finger tip area and in the palm area, wherein neighboring source regions in the finger tip area are connected to each other, and outmost two source regions in the palm area are connected to each other; a plurality of drain regions each having a stripe shape, disposed in the substrate in the finger body area and further extending into the substrate in the finger tip area and in the palm area, wherein neighboring drain regions in the palm area are connected to each other, and the source regions and the drain regions are disposed alternately; a plurality of gates, disposed on the substrate in the finger body area, wherein a gate is disposed between a source region and a drain region neighboring to the source region; and a plurality of first trench insulating structures, disposed in the substrate in the finger tip area and respectively surrounding ends of the drain regions.