Linear Technology Corporation

Edward William Olsen

Leonard Shtargot

David Roy Ng

Jeffrey Kingan Witt

A flipchip may include: a silicon die having a circuit side with solder bumps and a non-circuit side; a leadframe attached to the solder bumps on the circuit side of the silicon die; a heat spreader attached to the non-circuit side of the silicon die; and encapsulation material encapsulating the silicon die, a portion of the leadframe, and all but one exterior surface of the heat spreader. The leadframe may have NiPdAu plating on the portion that is not encapsulated by the encapsulation material and no plating on the portion that is attached to the solder bumps.

Exposed solderable heat spreader for flipchip packages

A method of making an integrated circuit package that contains a semiconductor die having one or more electrical connections to an electronic circuit within the semiconductor die. The method may include: encapsulating the semiconductor die and its electrical connections in non-electrically conductive, encapsulation material; laser drilling the encapsulation material to expose one of the electrical connections within the integrated circuit package, thereby creating a via opening in an external surface of the encapsulation material to the electrical connection; and electroplating or sputtering over the via opening in the encapsulation material to create a conductive routing layer from the exterior surface of the encapsulation material to the electrical connection.

Laser drilling encapsulated semiconductor die to expose electrical connection therein

An integrated circuit package may include a semiconductor die, a heat spreader, and encapsulation material. The semiconductor die may contain an electronic circuit and exposed electrical connections to the electronic circuit. The heat spreader may be thermally-conductive and may have a first outer surface and a second outer surface substantially parallel to the first outer surface. The first outer surface may be affixed to all portions of a silicon side of the semiconductor die in a thermally-conductive manner. The encapsulation material may be non-electrically conductive and may completely encapsulate the semiconductor die and the heat spreader, except for the second surface of the heat spreader. The second surface of the heat spreader may be solderable and may form part of an exterior surface of the integrated circuit package.

Exposed, solderable heat spreader for integrated circuit packages

A method of preparing a portion of the side of a terminal of an Integrated Circuit (IC) package for solder is disclosed. The method comprises the steps of attaching an IC die to a leadframe comprising a connecting bar, reducing the thickness of a portion of the connecting bar, overmolding the leadframe with a mold compound, removing the mold compound from the reduced-thickness portion of the connecting bar using a laser, coating the reduced-thickness portion of the connecting bar with a solder-wettable material, and cutting through the thickness of the connecting bar within the reduced thickness portion of the connecting bar, wherein the cut has a width that is less than the width of the reduced thickness portion of the connecting bar.

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San Jose, CA, United States of America

Edward William Olsen