BQ27421YZFT-G1B

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The BQ27421YZFT-G1B is part of Texas Instruments’ Battery Management family of integrated circuits. This part is a long life battery monitoring device that performs highly accurate and efficient charging and discharging of Li-ion, Li-polymer, Lithium-ion polymer and nickel metal-hydride batteries.The part provides near-accurate state-of-charge (SOC) information including dead band and alarm thresholds, alarm ratios and cell voltage monitoring capability. It also provides real-time battery status and other information to any programming enevelope to protect battery safety and extend the life of batteries.

The BQ27421YZFT-G1B package incorporates a single integrated circuit located on a small 8-pin dual in-line package (DIP), which allows customers to achieve a small overall solution size. This part is housed in a very small 4mm x 4mm QFN package that makes it ideal for applications that have limited space. This part is ideally suited for embedded applications such as cell phones, digital cameras, and MP3 players because it provides an accurate and reliable measuring method for fuel gauging.

The BQ27421YZFT-G1B supports several working principles in order to accurately determine the state-of-charge (SOC) of a battery. The first one is the coulomb counting principle, which relies on the number of nanocoulombs (nC) that are added or removed from the battery to determine the SOC. The second one is the voltage-based calculation principle, which uses the change in voltage across the battery cell to measure the SOC. The third one is the timer based principle, which uses discharge time to accurately measure the SOC of the battery.

The BQ27421YZFT-G1B is designed to monitor and manage safety critical functions in any battery powered device. It features an embedded processor that is capable of calculating highly accurate SOC values in real time. Moreover, it features a robust failure detection system, which includes several hardware and software-based fail-safe mechanisms that ensure safe operation in the event of any system failure. It also features a series of adjustable alert thresholds, which allow the system to provide timely warnings when the battery reaches the danger zone.

The BQ27421YZFT-G1B is ideal for applications requiring accurate and reliable battery monitoring and management. It is particularly suitable for portable or embedded products, such as cell phones, digital cameras, and MP3 players. Other common applications include medical equipment, smart watches, and other wearables requiring small form factor and robustness of design. This part provides an optimal solution for safely measuring and managing the SOC and other battery parameters.

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