MOTL603-AASR protection IC is a protection chip dedicated to 3-string lithium battery. It has built-in high-precision voltage detection circuit and current detection circuit. By monitoring the voltage and charge and discharge status of 3 strings of lithium batteries in series, it controls the protection MOS tube and performs overcharge, over-discharge, discharge overcurrent, charge overcurrent, and short-circuit protection to protect the reliability and safety of lithium batteries and products in use.