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.
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 1.5 times the output voltage. A X5R or X7R dielectric capacitor is recommended for its low ESR and high reliability.
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 low-ESR output capacitor, and add a 1uF ceramic capacitor between the VIN and GND pins. Additionally, ensure that the input voltage is well-regulated and the input capacitor is properly sized to prevent voltage droop.
The typical dropout voltage of the RT9198-33PBR is around 1.2V, but it can vary depending on the output current and input voltage. It's essential to consider the dropout voltage when designing the power supply to ensure the regulator can maintain the desired output voltage.
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