Richtek provides a recommended PCB layout in their application notes (AN-101) 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 ripple requirements. 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 capacitor is recommended for its low temperature coefficient and high reliability.
The maximum junction temperature (Tj) for the RT7296CGJ8F is 150°C. However, it's recommended to keep the junction temperature below 125°C for reliable long-term operation and to prevent thermal shutdown.
Richtek recommends using an external overvoltage protection (OVP) circuit to prevent damage from voltage surges or spikes. A simple OVP circuit can be implemented using a zener diode, resistor, and a voltage comparator. The OVP threshold should be set to 1.5 times the maximum input voltage rating.
Richtek recommends using a low-ESR ceramic capacitor with a minimum capacitance of 4.7uF and a voltage rating of at least 1.5 times the input voltage. A X5R or X7R dielectric capacitor is recommended for its low temperature coefficient and high reliability.
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RT7296CGJ8F Overview
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