US Patent 8716859 Enhanced flip chip package

A flip chip package structure is proposed in which a redistribution layer (RDL) is disposed on a surface of both a semiconductor chip and one or more lateral extensions of the semiconductor chip surface. The lateral extensions may be made using, e.g., a reconstituted wafer to implement a fanout region lateral to one or more sides of the semiconductor chip. One or more electrical connectors such as solder bumps or copper cylinders may be applied to the RDL, and an interposer such as a PCB interposer may be connected to the electrical connectors. In this way, a relatively tight semiconductor pad pitch may be accommodated and translated to an appropriate circuit board pitch without necessarily requiring a silicon or glass interposer.