Richtek provides a recommended PCB layout in their application note AND9133, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The input capacitor selection depends on the input voltage, output voltage, and output current. Richtek recommends using a low-ESR capacitor with a value between 4.7uF to 10uF, and a voltage rating of at least 1.5 times the input voltage. The application note AND9133 provides more detailed guidance on input capacitor selection.
The RT9069-33GQU has a thermal derating curve in the datasheet, which shows the maximum output current reduction at elevated ambient temperatures. For example, at 85°C, the maximum output current is derated to 70% of the nominal value. Engineers should consult the datasheet and application notes for specific derating guidelines.
Richtek recommends following the output capacitor selection guidelines in the application note AND9133, which includes a formula to calculate the minimum ESR and capacitance values for stability. Additionally, engineers can use simulation tools or consult with Richtek's technical support to ensure stability with a specific output capacitor.
Richtek recommends a soft-start sequence to prevent inrush currents and ensure reliable startup. The application note AND9133 provides a recommended startup sequence, which includes a slow ramp-up of the input voltage and a delay before enabling the output.
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