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 power lines. Avoid routing sensitive analog signals near the switching node.
Use a soft-start circuit to limit the inrush current during startup, and ensure the input voltage ramps up slowly. During shutdown, use a controlled shutdown sequence to prevent voltage spikes and ensure the output capacitors are fully discharged.
A low-ESR ceramic capacitor (e.g., X5R or X7R) with a value of 10-22uF is recommended. The capacitor should be placed close to the VIN pin and have a voltage rating of at least 1.5 times the maximum input voltage.
Use a combination of capacitors and inductors to filter the output. A 10-22uF ceramic capacitor in parallel with a 1-10uH inductor is a good starting point. Optimize the filter design using simulation tools or empirical methods to achieve the desired ripple and noise performance.
The MAX8791GTA+ is rated for operation from -40°C to +125°C. High temperatures can reduce the device's efficiency, increase its power consumption, and affect its reliability. Ensure proper thermal design and heat sinking to maintain a safe operating temperature.
MAX8791GTA+ datasheet
by Maxim Integrated Products
