Patent ID: 7812402
Filing Date: 2010-10-12
Classification: H01L

Abstract:
1. A semiconductor device for driving a switching device that includes 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 via a capacitive element; a semiconductor substrate of a first conductivity type, and having a first impurity concentration; a first impurity region of a second conductivity type formed in a main surface of said semiconductor substrate, said first impurity region having a second impurity concentration higher than that of said first impurity concentration; a second impurity region of said first conductivity type forming a well in a main surface of said first impurity region; a first transistor including a source/drain region of said second conductivity type, said source/drain region being formed in a main surface of said well and connected to said first terminal; a second transistor including a source/drain region of said first conductivity type, said source/drain region of said second transistor being formed in said main surface of said first impurity region and connected to said second terminal; and a buried layer of said second conductivity type having a third impurity concentration higher than that of said second impurity concentration and formed in said semiconductor substrate beneath said well and said source/drain region of said second transistor, said third impurity region being in contact with a bottom surface of said first impurity region.