A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the input and output capacitors close to the IC, and use short, wide traces for the high-current paths.
Use a thermal pad on the bottom of the IC, and ensure good airflow around the device. Also, consider using a heat sink or a thermal interface material to reduce the thermal resistance.
The MAX9788ETI+ can handle input voltages up to 42V, but it's recommended to keep the input voltage below 40V to ensure reliable operation.
The MAX9788ETI+ is rated for operation up to 125°C, but the device's performance and reliability may degrade at high temperatures. Consider using a heat sink or a thermal interface material to reduce the junction temperature.
Use an oscilloscope to monitor the input and output voltages, and check for any signs of oscillation or instability. Also, verify that the input voltage is within the recommended range and that the device is properly cooled.