Embedded substrate heat sink for bottom side cooling

Embodiments include semiconductor packages. A semiconductor package include a high-power electronic component and an embedded heat spreader (EHS) in a package substrate. The EHS is adjacent to the high-power electronic component. The semiconductor package includes a plurality of thermal interconnects below the EHS and the package substrate, and a plurality of dies on the package substrate. The thermal interconnects is coupled to the EHS. The EHS is below the high-power electronic component and embedded within the package substrate. The high-power electronic component has a bottom surface substantially proximate to a top surface of the EHS. The EHS is a copper heat sink, and the high-power electronic component is an air core inductor or a voltage regulator. The thermal interconnects are comprised of thermal ball grid array balls or thermal adhesive materials. The thermal interconnects couple a bottom surface of the package substrate to a top surface of a substrate.