The SD2054 is a battery management system supplied in SOT23-5 RoHS package manufactured by SHOUDING. It includes power management, overvoltage protection, over discharge protection, charging protection, short circuit protection, and cell balancing functionalities. The output port has low-voltage protection, output short protection, and loop voltage detection capability. It also has quick charging and pre-charging features, which enable fast charge and full-load operation. The SD2054 is designed for Li-ion battery applications, and it supports both charge and discharge operations. It is suitable for use in automotive electronic systems, consumer electronics, and other small portable devices.