Richtek provides a recommended PCB layout in their application note ANI-45, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
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 RT7281GSP. Additionally, consider using a voltage reference capacitor (CREF) to improve output voltage accuracy.
The maximum output current capability of the RT7281GSP is dependent on the input voltage, output voltage, and thermal conditions. According to Richtek's application note ANI-45, the maximum output current is typically around 3A, but can be higher or lower depending on the specific application and operating conditions.
The RT7281GSP has built-in OCP and SCP features. To implement these features, connect the OCP pin to a resistor divider network that sets the overcurrent threshold, and connect the SCP pin to a capacitor that sets the short-circuit detection time. Refer to the datasheet and application notes for specific implementation details.
Richtek recommends using a high-quality, low-ESR ceramic capacitor with a value of 10uF to 22uF for the input capacitor. The specific value and type of capacitor may vary depending on the input voltage, output voltage, and operating frequency.
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