10.1 Layout Guidelines
Careful PCB layout is critical to achieve low EMI and stable power supply operation. Make the high-frequency current loops as small as possible, and follow these guidelines of good layout practices:
- Keep the high-current paths short. This is essential for stable, jitter-free operation.
- Keep the power traces and load connections short. This is essential for high efficiency. Using 2-oz. or thicker copper can enhance full load efficiency.
- Minimize current-sensing errors by routing CS and VOUT using a kelvin sensing directly across the current sense resistor (RSENSE).
- Route high-speed switching nodes (HB, HO, LO, and SW) away from sensitive analog signals (FB, CS, and VOUT).