VIN and GND traces should be as
wide as possible to reduce trace impedance. The wide areas are also of advantage
from the view point of heat dissipation.
The input capacitor and output
capacitor should be placed as close to the device as possible to minimize trace
impedance.
Provide sufficient vias for the
input capacitor and output capacitor.
Keep the SW trace as physically
short and wide as practical to minimize radiated emissions.
Do not allow switching current to
flow under the device.
A separate VOUT path should be
connected to the upper feedback resistor.
Make a Kelvin connection to the
GND pin for the feedback path.
Voltage feedback loop should be
placed away from the high-voltage switching trace, and preferably has ground
shield.
The trace of the FB node should
be as small as possible to avoid noise coupling.
The GND trace between the output
capacitor and the GND pin should be as wide as possible to minimize its trace
impedance.