LS0502SCD33 Series Supercapacitor Protection IC

Littelfuse's LS0502SCD33 is a complete solution for systems with a backup storage capacitor or capacitor bank. It integrates input overvoltage, an overcurrent protection circuit, a reverse blocking switch, and a supercapacitor charging control circuit. It also has built-in cell balance to protect two-cell supercapacitor systems. When the main supply is present and above the minimum system supply voltage, the system will draw power from the input supply. At the same time, an integrated linear charger charges the storage element at up to 300 mA current. Once the storage element is charged, the circuit draws only 2.5 μA of current while maintaining the supercapacitor or other storage element in its ready state. When the main supply is removed, the integrated reverse blocking switch blocks current flow from the system rail to the input. The linear charger turns on to provide power to the system rail with a low resistance path with up to 2 A current. An integrated cell balancing circuit monitors the cell voltage when charging and keeps the two cells’ voltage at the same level.