The SK4054S5-42, with SOT23-5 ROHS (lead-free compliance) is a Battery Management IC from Suntek. It is designed to protect and monitor various battery packs. It has low external parts count, operates with a low current for the charge and discharge control of the batteries, and provides accurate residual capacity and State-of-Charge (SOC) information. It can operate in parallel or two series connection. This IC also has improved NMOS/PMOS Switch loss, low Thermal Resistance, Over-temperature Protection, Over-voltage Protection, Improved Current Sensing Accuracy, Improved System Performance, and current monitoring accuracy. Furthermore, the SK4054S5-42 is designed with high RF filter capability, allowing it to be used in applications with high sensitivity to RF.