Richtek provides a recommended PCB layout in their application note AND9231, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
Richtek recommends using an inductor with a saturation current rating of at least 2x the maximum output current, and a DC resistance (DCR) of less than 100 mΩ. The inductor's physical size, core material, and number of turns also impact performance; consult Richtek's application notes and inductor manufacturers' datasheets for guidance.
While the datasheet specifies a maximum Tj of 150°C, Richtek recommends keeping Tj below 125°C for reliable long-term operation. Exceeding this temperature can reduce the device's lifespan and affect performance.
To ensure stable operation with high-input voltages, Richtek recommends using a suitable input capacitor with a high voltage rating, and following the datasheet's guidelines for input capacitor selection. Additionally, consider adding a voltage divider or input voltage regulator to reduce the input voltage and minimize the risk of overvoltage stress.
Richtek recommends using a low-ESR ceramic capacitor (e.g., X5R or X7R) with a value of 10 μF to 22 μF, depending on the input voltage and output current requirements. The capacitor's voltage rating should be at least 1.5x the maximum input voltage.
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