BQ24170

The BQ24170 from Texas Instruments is a sophisticated, highly integrated battery charger IC designed for Li-Ion and Li-Polymer battery applications. It operates as a 1.6-MHz synchronous switched-mode charger, incorporating two N-channel power MOSFETs for efficient power conversion.

This device offers precise regulation of input current, charge current, and charge voltage, with accuracies of ±4% for input current and ±4% for charge current, and ±0.5% for charge voltage. It supports a wide input operating voltage range from 4.5 V to 17 V, with an absolute maximum rating of 20 V and an adjustable overvoltage protection up to 30 V. The charger can deliver a maximum charge current of 4 A.

Key features include automatic power path selection between adapter and battery, dynamic power management, and integrated safety functions such as thermal regulation that throttles back current to limit junction temperature to 120°C, and thermal shutdown. It also includes battery thermistor sensing for hot/cold charge suspend and battery detection. The BQ24170 is capable of charging 1, 2, or 3 cells with a charge voltage of 4.2 V per cell.

The BQ24170 is available in a VQFN package with body dimensions of 5.50 mm x 3.50 mm. Its high integration and efficiency make it suitable for applications like tablet PCs, portable data capture terminals, portable printers, medical diagnostics equipment, battery bay chargers, and battery backup systems.