This typical QFN package uses bond wires to connect the die to an exposed pad where the power switch exhibits significant ringing (a). An improved package utilizes copper pillars and a flip-chip interconnection from the die to the lead frame, which elimin
Figure 3. This typical QFN package uses bond wires to connect the die to an exposed pad where the power switch exhibits significant ringing (a). An improved package utilizes copper pillars and a flip-chip interconnection from the die to the lead frame, which elimin