PCB layout is an important part of any switching power supply design. A poor layout can cause unstable operation, load regulation problems, increased ripple and noise, and EMI issues.

The following PCB layout design guidelines are recommended:

• Place the input and output capacitors close to the device.
• Minimize the area of the input loop, and use short, wide traces on the top layer to connect the input capacitor to the VIN and GND pins.
• Minimize the area of the output loop, and use short, wide traces on the top layer to connect the output capacitor to the VOUT and GND pins.
• The location of the inductor on the PCB is less important than the location of the input and output capacitors. Place the inductor after the input and output capacitors have been placed close to the device. Route the traces to the inductor on an inner layer if necessary.