Patent ID: 7233043
Filing Date: 2007-06-19
Classification: H01L

Abstract:
1. A trench MOSFET comprising: a semiconductor chip doped with impurity of a first conductivity type, the chip having first, second and third trenches formed at a surface of the chip, the first and second trenches defining a first mesa, the second and third trenches defining a second mesa; a first source region of the first conductivity type in the first mesa, the first source region being adjacent the surface of the chip; a second body region of a second conductivity type opposite to the first conductivity type in the first mesa, the second body region forming a first junction with the first source region, the second body region extending below the first and second trenches such that the second body region is adjacent the bottoms of the first and second trenches; a third source region of the first conductivity type in the second mesa, the third source region being adjacent the surface of the chip; a fourth body region of the second conductivity type in the second mesa, the fourth body region forming a second junction with the third source region, the fourth body region comprising a first channel region adjacent a wall of the second trench; and a fifth drain region of the first conductivity type in the second mesa, the fifth drain region forming a third junction with the fourth body region.