Richtek provides a recommended PCB layout guide in their application note AND9133, which includes guidelines for thermal vias, copper pours, and component placement to ensure optimal thermal performance.
To optimize output voltage accuracy and stability, ensure that the input voltage is within the recommended range, use a high-quality output capacitor with low ESR, and minimize the distance between the output capacitor and the RT9086-28GB. Additionally, consider using a voltage reference capacitor with a high accuracy and low temperature coefficient.
The maximum output current capability of the RT9086-28GB is 8A, but it can be limited by the thermal performance of the PCB and the ambient temperature. It's recommended to derate the output current based on the junction temperature and thermal resistance of the device.
Richtek recommends using an overvoltage protection (OVP) circuit and an undervoltage lockout (UVLO) circuit to protect the RT9086-28GB from voltage transients and faults. The OVP circuit can be implemented using a zener diode and a resistor, while the UVLO circuit can be implemented using a voltage comparator and a reset circuit.
Richtek recommends using a high-quality, low-ESR ceramic capacitor with a value of 10uF to 22uF for the input capacitor. The capacitor should be placed as close as possible to the VIN pin of the RT9086-28GB to minimize the input voltage ripple and noise.
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