The performance of any switching converter depends
as much on the layout of the PCB as the component selection. The following
guidelines can help you design a PCB with the best power converter performance:
- Place ceramic high-frequency bypass capacitors as close as possible to the TPS92519-Q1 VIN and PGND pins. Grounding for both the input and output capacitors must consist of localized top side planes that connect to the PGND pins.
- Place bypass capacitors for V5D and V5A close to the pins and ground the capacitors to device ground.
- Differentially route the CSP and CSN pins to sense resistor. Route the traces
away from noisy nodes, preferably through a layer on the other side of a
shielding or ground layer.
- Use ground plane in one of the middle layers for noise shielding.
- Make VIN and ground connection as wide as possible. This action reduces any
voltage drops on the input of the converter and maximizes efficiency.