Patent ID: 8552585

Claim:
A flip chip semiconductor device comprising: a die, comprising: a highly doped semiconductor substrate having top and bottom surfaces; an epitaxial layer formed over said top surface of said substrate; a first p-channel laterally diffused metal oxide semiconductor (LDMOS) transistor formed over said top surface of said semiconductor substrate; at least one second p-channel LDMOS transistors formed over said top surface of said semiconductor substrate; first drain and gate electrodes formed over said top surface of said substrate and electrically coupled to said first LDMOS transistor; second drain and gate electrodes formed over said top surface of said substrate and electrically coupled to said second LDMOS transistor; and one or more common source electrodes formed over said top surface of said substrate and electrically coupled to said first and second LDMOS transistors, a first conductor electrically coupling a source region of said first LDMOS transistor to said substrate through said epitaxial layer; a second conductor electrically coupling a source region of said second LDMOS transistor to said substrate through said epitaxial layer; and a third conductor electrically coupling said substrate to said one or more common source electrodes through said epitaxial layer; a passivation layer formed over said die; and a plurality of conductive bumps formed over said passivation layer and electrically coupled to said electrodes.