Richtek provides a recommended PCB layout in their application note ANI08, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. Richtek recommends using a low-ESR capacitor with a minimum capacitance of 10uF and a voltage rating of at least 2x the output voltage. A X5R or X7R dielectric is recommended for stable operation.
Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and prevent damage to the internal components.
To ensure stability, follow the recommended PCB layout, use a suitable output capacitor, and add a 1uF ceramic capacitor between the VIN and GND pins. Additionally, avoid using long traces and minimize the distance between the input and output capacitors.
The typical dropout voltage of the RT9083-33GJ5 is around 0.5V to 1.0V, depending on the output current and input voltage. This means that the input voltage should be at least 0.5V to 1.0V higher than the output voltage to ensure proper regulation.
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