RT9629AZQW footprint, schematic symbol and 3D model by RICHTEK

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RT9629AZQW Details

Richtek provides a recommended PCB layout in their application note ANI-23, 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 is recommended for optimal performance.
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.
The RT9629AZQW has a built-in overcurrent protection feature that can be enabled by connecting a resistor between the OCP pin and GND. The value of the resistor determines the overcurrent threshold. Richtek provides a calculation formula in their datasheet to determine the correct resistor value.
Richtek recommends using a 1uF to 10uF ceramic capacitor with a voltage rating of at least 1.5 times the input voltage. A X5R or X7R dielectric is recommended for optimal performance. The input capacitor should be placed as close as possible to the VIN pin to minimize noise and ripple.

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