Layout is a critical portion of good power supply design. The following guidelines help users design a PCB with the best power conversion performance, thermal performance, and minimized generation of unwanted EMI.

1. Keep the feedback network, resistors R1 and R2, close to the FB pin, and away from the inductor to minimize coupling noise into the feedback pin.
2. Place the input capacitor C_IN close to the V_IN pin. This action reduces copper trace inductance which effects input voltage ripple of the device.
3. Place the inductor L1 close to the SW pin to reduce magnetic and electrostatic noise.
4. Place the output capacitor C_OUT close to the junction of L1 and the diode D1. The L1, D1 and C_OUT trace must be as short as possible to reduce conducted and radiated noise.
5. Tie the ground connection for the diode, C_IN and C_OUT to the system ground plane in only one spot (preferably at the C_OUT ground point) to minimize conducted noise in the system ground plane.