BQ2050HSN

The BQ2050HSN from Texas Instruments is a Lithium Ion Power Gauge™ IC intended for battery pack or in-system installation to maintain an accurate record of available battery capacity. This IC accurately measures available capacity in Lithium Ion batteries and provides a low-cost battery management solution. It features a high-speed 5kb single-wire communication interface (HDQ bus) for critical battery parameters and low operating current of 120µA typical, with less than 100nA of data retention current.

The BQ2050HSN monitors a voltage drop across a sense resistor to determine charge and discharge activity. Compensations for battery temperature, self-discharge, and discharge rate are applied to the charge counter for accurate capacity information across various operating conditions. The battery capacity is automatically recalibrated during discharge cycles. Nominal available capacity can be directly indicated using a five-segment LED display.

This component comes in a 16-pin narrow SOIC package and operates within a temperature range of 0 to 70°C. It is suitable for pack integration where space is a constraint, as the complete circuit can fit in as little as 1/2 square inch of PCB space. The IC also monitors and controls the charge FET in the Li-Ion pack protection circuit.