The performance of switching converters heavily depends on the quality of the PCB layout. The following guidelines can help users design a PCB with the best power conversion performance, thermal performance, and minimize generation of unwanted EMI.

• Put the D1 component on the board first.
• Use a small size ceramic capacitor for C_OUT.
• Make the switching loop (C_OUT to D1 to SW to PGND to C_OUT) as small as possible.
• Leave a copper area near the D1 diode for thermal dissipation.
• Put the C_VCC capacitor as near the device as possible between the VCC and PGND pins.
• Connect the COMP pin to the compensation components (R_COMP and C_COMP).
• Connect the C_COMP capacitor to the analog ground trace.
• Connect the AGND pin directly to the analog ground plane. Connect the AGND pin to the R_MODE, R_UVLOB, R_T, C_SS, and R_FBB components.
• Add several vias under the exposed pad to help conduct heat away from the device. Connect the vias to a large ground plane on the bottom layer.