Patent ID: 8288235

Claim:
A method of forming a device comprising: providing a substrate defined with a device region, wherein the device region includes a drift well having first polarity type dopants; forming a doped isolation well in the substrate, wherein the drift well is disposed in the doped isolation well; forming a gate of a transistor in the device region, the gate having first and second sides; implanting second polarity type dopants into the substrate in the first side of the gate to form a body within the drift well, wherein the implant is self-aligned to the gate, the body having an under-lap portion on the first side of the gate with a length L, wherein the length L is small to achieve a low Rdson; and forming first and second diffusion regions having first polarity type dopants in the substrate in the device region adjacent to the first and second sides of the gate, wherein the first diffusion region is within the body and the second diffusion region is within the drift well.