Patent ID: 8872265
Filing Date: 2014-10-28
Classification: H01L

Abstract:
1. A trench power MOSFET, comprising: a base having an active region and a termination region surrounding the active region, wherein the termination region has at least a corner region; a plurality of first trenches, disposed in the active region; and a plurality of second trenches, disposed in the termination region, the second trenches surrounding the first trenches, each of the second trench having an isolation layer and a conductive material deposited inside, and the second trenches extended outwardly from the active region side toward an edge of the base, respectively; wherein the isolation layer is disposed to cover the inner surface of the second trench; wherein the second trenches are radially arranged around the active region, the second trenches in the corner region of the termination region are close together on a side facing the active region, and the second trenches space out as the second trenches extend away from the active region.