Patent ID: 9230949
Filing Date: 2016-01-05
CPC Classification: H01L

Claim Text:
1. A method for forming a stacked multi-chip packaging structure, the method comprising the steps of: providing a lead frame comprising a first die paddle, a second die paddle and a plurality of pins separated from each other, wherein the second die paddle comprises a first part and a second part separated from each other; attaching a first semiconductor chip to the first die paddle with an electrode at a back surface of the first semiconductor chip being electrically connected to the first die paddle; flipping and attaching a second semiconductor chip to the second die paddle with an electrode at a front surface of the second semiconductor chip being electrically connected to the first part of the second die paddle and another electrode being electrically connected to the second part of the second die paddle; attaching a metal clip to the first semiconductor chip and the second semiconductor chip with a bottom surface of metal clip being electrically connected to electrodes arranged on a front surface of the first semiconductor chip and an electrode arranged on a back surface of the flipped second semiconductor chip; attaching a third semiconductor chip to a top surface of the metal clip with the third semiconductor chip being electrically isolated from the metal clip; forming bonding wires between the electrodes of different semiconductor chips or between the electrode of a semiconductor chip and a pin; and forming a plastic package body for encapsulating the third semiconductor chip, the metal clip, the first semiconductor chip and the second semiconductor chip and the lead frame which are stacked into a multi-layer structure in sequence, and then separating individual stacked multi-chip packaging structures by cutting through the plastic package body, wherein portions of the pin and portions of the back surface of the first die paddle and the second die paddle are exposed from the plastic package body for electrically connecting to an external device.