RICHTEK RT8481AGE

The RT8481A is a secondary-side CC/CV controller for SPS applications. It integrates a Constant Current (CC) regulating amplifier, a Constant Voltage (CV) regulating amplifier, and 2 precision reference voltages. The CC regulating amplifier is featured with an extended input common mode voltage below GND level to insure the performance of low-side current sense, and a very low input offset voltage to guarantee the sensing accuracy. A 60mV reference voltage is internally connected between the inverting input of the CC regulating amplifier and the CP pin. The non-inverting input is the CN pin, at which the voltage will be regulated 60mV higher than that at the CP pin. The inverting input pin CP is equiped with -5V antireverse immunity. The CV regulating amplifier with low input offset voltage is biased with a 2.5V reference voltage at the inverting input. The non-inverting input is the FB pin, at which the voltage will be regulated with 2.5V from GND. The CC and CV amplifiers share an open-collector output pin to minimize application circuit. The RT8481A is available in the SOT-23-6 package.

• Secondary-Side Constant Voltage (CV) and Constant Current (CC) Control
• 4.75V to 50V Operation Voltage Range
• ±1% Output Voltage Accuracy at Full Temperature Range
• 0.6mA Quiescent Current
• Smooth Transition Between CC and CV Control Loops
• -5V Negative Voltage Tolerance at CP pin

• Battery Chargers
• AC/DC Adaptors
• LED Drivers