Patent ID: 7545005
Filing Date: 2009-06-09
Classification: H01L

Abstract:
1. A semiconductor device for driving a switching device having a first electrode, a second electrode, and a control electrode, said semiconductor device comprising: a first terminal connected to said first electrode; a second terminal connected to said first electrode through a capacitive element; a semiconductor substrate having a first conductivity type; a first impurity region formed in a main surface of said semiconductor substrate and having a second conductivity type; a second impurity region formed in a main surface of said first impurity region and having said first conductivity type; a first transistor having a source/drain region of said second conductivity type, said source/drain region of said first transistor being formed in a main surface of said second impurity region and connected to said first terminal; a second transistor having a source/drain region of said first conductivity type, said source/drain region of said second transistor being formed in the main surface of said first impurity region and connected to said second terminal; a third impurity region formed in said main surface of said first impurity region, having said first conductivity type, and connected to said first or second terminal; a trench formed in said main surface of said first impurity region and extending through said third impurity region; and a fourth impurity region formed in said first impurity region in a portion that defines wall surfaces of said trench, having said first conductivity type, and connected to said first or second terminal.