BQ27210DRKRG4

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The BQ27210DRKRG4 is a battery management system (BMS) integrated circuit (IC) from Texas Instruments. It provides the functionality to monitor and protect a single cell Lithium-ion or Lithium-polymer battery pack. This chip is often employed in wearables, medical systems, and battery powered home appliances. As an integrated solution, the BQ27210DRKRG4 contains specialized components for buck and boost multiplexing, battery pack/stack protection, and active balancing. This IC also provides a system interface for battery cell monitoring of voltage, temperature and pack level.

Overview

The BQ27210DRKRG4 consists of an analog front-end (AFE) and multiplexer, a battery protection block, a system monitor, and a system interface circuit. The AFE and multiplexer monitors the voltage of each cell in the battery stack and are connected to the system monitor and interface which then interfaces with the host system. The battery protection block is used to provide maximum and minimum thresholds for the range of battery cell voltages to protect the battery as well as an overvoltage or undervoltage flag signal that can be passed back to the host system. Additionally, the BQ27210DRKRG4 includes two active balancing circuits to ensure each cell in the stack is properly balanced in terms of voltage.

Application Field

The BQ27210DRKRG4 is designed primarily for use in single cell protection, monitoring and balancing of portable applications such as medical devices, industrial systems and wearables. These applications typically demand a single cell protection and monitoring IC as it offers a more efficient and cost effective solution than independently monitoring each cell in a stack. In addition, the active balancing feature offered by the BQ27210DRKRG4 makes it a valuable resource for maintaining a level of battery pack/stack performance.

Working Principle

The BQ27210DRKRG4’s integrated system works on two principle components, the Analog Front End and the System Interface. First, the Analog Front End constantly monitors the battery pack, measuring the voltage and current of each cell in the stack, while also providing a programmable overvoltage or undervoltage protection level. This information is then passed to the System Interface, which is responsible for reporting the data to the host system. The System Interface can also be configured to issue alarms for undervoltage, overvoltage, and overcurrent thresholds using the active balancing circuits.

The BQ27210DRKRG4 is also capable of monitoring the battery temperature in the pack and issuing an alarm when the temperature rises above a predetermined threshold. This feature is important, as high temperature operation in certain battery types can result in a decrease in cell life or even catastrophic failure. In addition to these features, the BQ27210DRKRG4 can also provide precise fuel gauge information to the host system as based on the measurements taken and the active balancing circuits.

Conclusion

The BQ27210DRKRG4 is a comprehensive single-cell protection, monitoring and balancing IC designed for use in portable devices, medical systems and wearable applications. The integrated components of this chip monitor the batteries in the pack, setting and monitoring overvoltage, undervoltage and overcurrent thresholds and providing fuel gauge information to the host system. The active balancing feature of the BQ27210DRKRG4 makes it an ideal solution for battery system maintenance.

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