Patent ID: 8569780

Claim:
A trench semiconductor power device integrated with a Gate-Source clamp diode for ESD protection, wherein: said trench semiconductor power device comprising: a plurality of first type trenched gates formed in a semiconductor silicon layer; source regions of a first conductivity type encompassed in body regions of a second conductivity type between two adjacent of said first type trenched gates, said source regions being connected to a source metal layer of said trench semiconductor power device; said Gate-Source clamp diode comprising: multiple back to back poly-silicon Zener diodes with alternating doped regions of said first conductivity type next to said second conductivity type; a plurality of trenched Gate-Source clamp diode contacts extending into all of said doped regions of said first conductivity type of said Gate-Source diode, and each being filled with a contact metal plug padded by a barrier metal layer; and said Gate-Source clamp diode being connected to a first gate metal layer on one side, and connected to said source metal layer on another side; wherein said first gate metal layer acting as a gate metal pad for gate metal bonding is connected to a second gate metal layer through a trenched resistor formed in said semiconductor silicon layer and partially disposed below said back to back poly-silicon Zener diodes, wherein said second gate metal layer is connected to at least a second type trenched gate having wider trench width than said first type trenched gates, and extending to said first type trenched gates for gate connection through a trenched gate contact filled with said contact metal plug in said second type trenched gate.