Texas Instruments BQ29440 Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.35V) BQ29440DRBR

The BQ29440DRBR is a secondary over-voltage protection integrated circuit designed for use in 2-series, 3-series, or 4-series cell Li-Ion battery packs. It features high-accuracy overvoltage detection with a precision of ±25 mV across a temperature range of 0°C to 60°C. The device supports fixed overvoltage protection thresholds of 4.30V, 4.35V, 4.40V, 4.45V, and 4.50V, making it suitable for various applications including notebook computers, power tools, and portable equipment. The BQ29440 operates with a low power consumption of less than 2 µA, enhancing its efficiency in battery management systems. It includes an external capacitor-controlled delay timer, which allows for customizable delay times in response to overvoltage conditions. The device is housed in a compact 8-pin QFN package, facilitating integration into space-constrained designs. Engineers considering the BQ29440 for their projects will find it a reliable solution for protecting Li-Ion battery packs from overvoltage scenarios, ensuring safety and longevity in battery-operated devices.