Patent ID: 6849940

Claim:
An integrated circuit package comprising: a first substrate having a first surface and a second surface, the first substrate including at least one heat-generating circuit and having a first coefficient of thermal expansion; and a second substrate having at least a first surface and a second coefficient of thermal expansion that is substantially equal to the first coefficient of thermal expansion, the first surface of the second substrate being thermally coupled to the second surface of the first substrate, the second substrate functioning to thermally conduct heat generated by the at least one heat-generating circuit away from the at least one heat-generating circuit; a metallic heat sink thermally coupled to the second surface of the second substrate, wherein a coefficient of thermal expansion of metallic heat sink is substantially different than the first coefficient of thermal expansion and the second coefficient of thermal expansion; and an external epoxy molding material disposed exterior to the metallic heat sink such that the metallic heat sink, the second substrate and the first substrate are fully encapsulated by the external epoxy molding material.