Patent ID: 8441065

Claim:
A semiconductor device for use in an automobile, including: a semiconductor substrate; a P-channel trench gate MOSFET having a gate electrode, a source and a drain, disposed over a main surface of the semiconductor substrate; and a protection circuit coupled to the gate electrode of the P-channel trench gate MOSFET, the protection circuit comprising a P-channel planar gate MOSFET disposed over the main surface of the semiconductor substrate, wherein a conduction type of the gate electrode of the P-channel trench gate MOSFET is P-type, wherein a conduction type of a gate electrode of the P-channel planar gate MOSFET is n-type, wherein the source of the P-channel trench gate MOSFET is coupled to a battery in the automobile, wherein the drain of the P-channel trench gate MOSFET is coupled to a load in the automobile, wherein the load is coupled to a ground terminal in the automobile.