Patent ID: 7477943
Filing Date: 2009-01-13
Classification: A61N,H01L

Abstract:
1. An implantable medical device comprising: a semiconductor substrate having a top surface; an epitaxial layer overlying the semiconductor substrate top surface, the epitaxial layer having a top surface; a high voltage termination region formed in the epitaxial layer; a power transistor formed in the epitaxial layer having a first electrode, a control electrode, and a second electrode wherein a breakdown voltage of the power transistor is greater than 100 volts and wherein current flow of the transistor is vertical through the epitaxial layer to the semiconductor substrate; and a backside contact coupling to the first electrode of the power transistor comprising at least one deep trench etched through the epitaxial layer, the deep trench extending from the epitaxial layer top surface to the semiconductor substrate and exposing the semiconductor substrate top surface wherein the at least one deep trench is etched in an area outside the high voltage termination region.