Patent ID: 8569169

Claim:
A manufacturing method of a bottom source power MOSFET device comprising: forming a gate metal and a source metal at a first surface of a semiconductor chip, the gate metal and the source metal being electrically insulated from each other, wherein forming the gate metal and source metal at the first surface of the semiconductor chip further comprising: forming an initial insulation layer on a substrate of the semiconductor chip; and depositing a metal layer on top of the initial insulation layer and patterning the metal layer into the gate metal and the source metal; forming a source electrode bump on the source metal by depositing a first insulation layer encapsulating the gate metal and an edge portion of the source metal, and electrode plating a metal onto the source metal exposed through the first insulation layer; depositing a dielectric material overlaying the gate metal and part of the source metal not covered by the source electrode bump, a surface of the dielectric material being coplanar to a surface of the source electrode bump; forming a source electrode metal layer overlaying the surface of the source electrode bump and the surface of the dielectric layer, wherein the source electrode metal layer being ready for connecting to the external devices; grinding the semiconductor chip from its second surface to reduce its thickness; depositing a drain metal layer on the second surface of the semiconductor chip; forming a through via above the gate metal from the second surface of the semiconductor chip to expose a portion of the gate metal; and forming an insulation layer covering a side wall of the through via; wherein the step of depositing the dielectric material overlaying the gate metal and part of the source metal not covered by the source electrode bump further comprising depositing a molding compound to cover the first insulation layer and the source electrode bump, and removing a portion of the molding compound to expose the surface of the source electrode bump.