Texas Instruments BQ24171 JEITA Compliant Stand-Alone Switch-Mode Li-Ion and Li-Polymer Battery Charger BQ24171RGYT

The BQ24171RGYT is a highly integrated stand-alone switched-mode battery charger designed for Li-Ion and Li-Polymer batteries. It features a constant-frequency synchronous PWM controller with an efficiency of up to 94%. The device supports input voltages from 4.5V to 17V and can handle up to 30V with adjustable overvoltage protection. It is capable of charging up to three series cells with an adjustable charge voltage and includes two integrated N-channel MOSFETs for power management. The BQ24171RGYT operates in three charging phases: preconditioning, constant current, and constant voltage, with charge termination occurring when the current drops to 10% of the fast charge rate. It incorporates Dynamic Power Management to prevent adapter overload and features a programmable charge timer for safety. The device also includes thermal regulation and shutdown features to protect against overheating. This charger is suitable for various applications, including tablet PCs, netbooks, portable data capture terminals, and medical diagnostics equipment. It comes in a compact 24-pin QFN package measuring 5.5mm x 3.5mm, making it suitable for space-constrained designs.