QFN Packaging of Flip Chip in Motor Drive

Flip chip QFN (FCQFN) packaging is similar to conventional QFN packaging, but its chips are directly connected to the board at the bottom of the device in an inverted manner, rather than using bonding wires to connect to the packaging board. These boards can be placed on the opposite side of the heating power device on the chip, so they are usually arranged in a long strip shape instead of a small board shape.

Small through-holes can be placed within the board area, similar to conventional QFN packaging. On multi-layer boards with power and ground planes, through holes can directly connect these boards to each layer. In other cases, the copper area must be directly connected to the board in order to absorb heat from the IC into the larger copper area.

PCB Layout of FCQFN Encapsulated ICs

The copper area on the left side of the device is the power input port. This larger copper area is directly connected to the two power boards of the device.

Three output boards are connected to the copper area on the right side of the device. Pay attention to expanding the copper area as much as possible after exiting the board. This can fully transfer heat from the board to the ambient air.

Meanwhile, pay attention to the rows of small through holes in the two boards on the right side of the device. These boards are all grounded, and a solid grounding layer is placed on the back of the PCB. These through-holes have a diameter of 0.46 mm and a drilling diameter of 0.25 mm. The through-hole is small enough to fit within the board area.

In summary, in order to implement successful PCB design using motor driver ICs, careful layout of the PCB is necessary.

SIVO Electric Motor is a high-tech enterprise focusing on motor R&D, manufacturing and sales. It is one of the core enterprises in the manufacturing sector of China's top 500 private enterprises under the Fangyuan Group. Our main products are High Efficiency Motor，AC Motor，Brushless AC Electric Motor，3 Phase AC Gear Motor，Three Phase AC Induction Motor ，Asynchronous Motor,Brushed DC Motor,Single Phase AC Motor.