A 4-layer PCB with a solid ground plane and thermal vias is recommended. The RT7273GQW's thermal pad should be connected to the ground plane using multiple thermal vias to ensure efficient heat dissipation.
To ensure stable and accurate output voltage, it is essential to use a high-quality output capacitor with low ESR and a sufficient capacitance value (e.g., 10uF). Additionally, the input voltage should be well-regulated, and the output voltage should be decoupled with a capacitor (e.g., 1uF) to filter out noise.
Although the datasheet specifies a maximum input voltage of 18V, it is recommended to limit the input voltage to 15V to ensure reliable operation and prevent damage to the device.
To protect the RT7273GQW from overcurrent and short-circuit conditions, it is recommended to add an external current-sensing resistor (e.g., 0.1 ohm) and a fuse (e.g., 1A) in series with the input voltage. Additionally, a short-circuit protection circuit can be implemented using a comparator and a MOSFET.
A high-quality, low-ESR input capacitor (e.g., 10uF, X5R or X7R dielectric) is recommended to filter out input noise and ensure stable operation. The capacitor value should be selected based on the input voltage ripple requirement and the device's input capacitance requirement.
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RT7273GQW Overview
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