RichTek Technology Corporation Power Supply Controllers, Monitors RT8481AGE

The RT8481A is a secondary-side constant current (CC) and constant voltage (CV) controller designed for switch-mode power supply (SPS) applications. It operates within a voltage range of 4.75V to 50V and features a low quiescent current of 0.6mA. The device integrates a CC regulating amplifier with a 60mV reference voltage for accurate current sensing, and a CV regulating amplifier with a 2.5V reference voltage for output voltage regulation. The CC and CV amplifiers share a common open-collector output pin, simplifying the application circuit. The RT8481A is housed in a compact SOT-23-6 package and is suitable for applications such as battery chargers, AC/DC adapters, and LED drivers. It provides ±1% output voltage accuracy across the full temperature range and includes negative voltage tolerance at the CP pin, enhancing its robustness in various operating conditions. The maximum junction temperature is rated at 125°C, with a thermal resistance of 243.3°C/W for the SOT-23-6 package, allowing for effective thermal management in designs.