BQ28Z620

The BQ28Z620 is a highly integrated fuel gauge IC designed by Texas Instruments for monitoring and managing the state of charge (SoC) in lithium-ion battery packs. It utilizes the Impedance Track™ algorithm to provide accurate SoC estimation, even under varying load conditions and temperature changes. The device supports single-cell Li-ion batteries and offers high precision with an accuracy of ±1% in SoC measurement, making it suitable for applications requiring reliable energy management. This fuel gauge integrates a 16-bit microcontroller, an analog front-end for voltage and current sensing, and a dedicated digital signal processor for real-time battery parameter calculations. It includes built-in protection features such as over-voltage, under-voltage, over-current, and over-temperature detection, enhancing system safety. The BQ28Z620 also supports configurable alert thresholds and provides detailed diagnostics through I²C communication, enabling efficient troubleshooting and system-level monitoring. Designed for low-power operation, the BQ28Z620 operates in active mode with a typical current consumption of 30 µA and enters ultra-low power sleep mode with less than 1 µA, ideal for battery-powered devices where energy efficiency is critical. Its flexible configuration allows customization of parameters like calibration intervals, temperature compensation, and cell balancing strategies via software, ensuring adaptability across diverse battery chemistries and pack designs. The device supports various battery configurations including series-connected cells and includes support for external thermistors for precise temperature monitoring. With a wide operating voltage range from 2.7 V to 5.5 V, it is compatible with a broad range of battery systems. Additionally, it features robust electrostatic discharge (ESD) protection up to ±8 kV HBM, improving reliability in harsh environments. Applications for the BQ28Z620 span consumer electronics, portable medical devices, industrial tools, and smart wearables—anywhere accurate battery life prediction and intelligent power management are essential. Its compact 24-pin QFN package ensures easy integration into space-constrained designs while maintaining high performance and long-term stability.