Patent ID: 7960222
Filing Date: 2011-06-14
Classification: H01L

Abstract:
1. A method for manufacturing an N-type lateral diffusion metal oxide semiconductor (LDMOS) transistor, wherein the method comprises the steps of: forming a first N-type buried layer over a P-type substrate; forming a first epitaxial layer over the first N-type buried layer; forming a second N-type buried layer over a first portion of the first N-type buried layer; forming a P-type buried layer over a second portion of the first N-type buried layer, the P-type buried layer next to the second N-type buried layer; forming a second epitaxial layer over the second N-type buried layer and over the P-type buried layer; wherein an Ndrift region in the second epitaxial layer, a P well region in the second epitaxial layer, and the first N-type buried layer form a protection NPN bipolar transistor in the LDMOS transistor.