BQ2031SN-A5

The BQ2031SN-A5 from Texas Instruments is an integrated circuit designed for charging Lead Acid batteries. It features a switch-mode buck control topology, enabling efficient power conversion. The device accepts an input voltage between 4.5V and 5.5V, with an absolute maximum rating of 7V.

This battery charger IC supports a maximum charge current of 2A and can charge batteries with up to 6 series cells. It offers a programmable charge voltage range from 0V to 20V. Key features include BAT temperature thermistor monitoring for hot/cold profiles, pin-selectable charge algorithms (Two-Step Voltage, Two-Step Current, Pulsed Current), and pin-selectable charge termination by maximum voltage, minimum current, and maximum time.

Additional functionalities include pre-charge qualification to detect and condition damaged cells, continuous charging qualification based on temperature and voltage limits, and an internal temperature-compensated voltage reference. The BQ2031SN-A5 utilizes pulse-width modulation control for high-efficiency power conversion and includes direct LED control outputs to display charge status and fault conditions. It is available in a 16-SOIC package and is suitable for surface mount applications.

The operating temperature range for this IC is -20°C to 70°C. It conforms to battery manufacturers' charge recommendations for cyclic and float charge, making it a versatile solution for battery management systems.