A 4-layer PCB with a solid ground plane and thermal vias is recommended. Keep the switching node (SW) pin away from sensitive analog nodes and ensure good thermal conduction to the heat sink.
Ensure the output capacitor has a low ESR, use a sufficient output capacitance (e.g., 10uF), and add a 1-2nF ceramic capacitor in parallel with the output capacitor to filter high-frequency noise.
The maximum input voltage is 18V, but it's recommended to keep it below 15V for optimal performance and reliability.
Use the FB (feedback) pin and a resistive divider to set the output voltage. The FB pin voltage is 0.8V, so adjust the resistors to achieve the desired output voltage.
The maximum output current is 3A, but it's recommended to derate the output current based on the ambient temperature and PCB thermal design.
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RT8009GJ5 Overview
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