Patent ID: 7723780
Filing Date: 2010-05-25
Classification: H01L

Abstract:
1. A method of manufacturing a lateral DMOS device having a body diode, the method comprising: providing a first conduction type semiconductor substrate having a body diode region and a protective diode region; forming a second conduction type well in the body diode region and the protective diode region of the first conduction type semiconductor substrate, and forming a drain region and a first conduction type body region in the second conduction type well; and then forming a first conduction type impurity region in the first conduction type body region; and then forming a source region only in the body diode region adjacent to the first conduction type impurity region in a prescribed region; and then forming a field insulating film in a device separation region of the semiconductor substrate in which the source region is formed, the field insulating film overlapping the body diode region and the protective diode region; and then forming a gate insulating film and a gate electrode in a gate forming region of the semiconductor substrate on which the field insulating film is formed, wherein the first conduction type body region formed in the protective diode region is formed at a concentration level higher than a concentration level of the first conduction type body region of the body diode region.