BQ2002SNG4

Overview

The BQ2002SNG4 is a smart battery monitor IC from Texas Instruments designed for single-cell lithium-ion and lithium-polymer battery packs. It integrates a high-accuracy coulomb counter, voltage measurement, and temperature sensing to provide precise state-of-charge (SOC) and remaining capacity data. The device features an I2C-compatible interface for communication with host processors. It includes programmable alarms for over-voltage, under-voltage, and temperature thresholds. The component operates within a specified supply voltage range and supports various protection functions essential for maintaining battery health and safety in portable electronic applications.

Feature Summary

• Integrates a precision coulomb counter for accurate charge tracking and state-of-charge calculation
• Provides comprehensive battery protection through programmable over-voltage, under-voltage, and temperature alarms
• Features an I2C-compatible serial interface for efficient communication with host microcontrollers

Applications

• Single-cell lithium-ion battery pack management in portable electronics
• Lithium-polymer battery monitoring in mobile devices
• Smart battery systems requiring precise state-of-charge indication

Procurement Notes

Verify the specific suffix 'G4' indicates lead-free and RoHS compliance status as per Texas Instruments documentation. Confirm the package type matches the required PCB footprint and thermal requirements for the target application. Ensure the I2C address configuration aligns with the system design constraints. Check for any updated revision notes that may affect electrical characteristics or pin compatibility before finalizing procurement.

Selection Notes

Select this component when precise coulomb counting is required for single-cell Li-ion or Li-Po batteries. It is suitable for applications needing integrated protection and SOC reporting via a standard serial interface. Consider the operating temperature range and accuracy specifications relative to the environmental conditions of the end product. Evaluate the need for programmable alarm thresholds to ensure system safety meets regulatory standards.

Part Context

The BQ2002 series belongs to Texas Instruments' family of smart battery monitors. These devices are widely used in consumer electronics where battery life prediction and protection are critical. The BQ2002SNG4 specifically offers a compact solution for managing single-cell chemistries, providing a balance between functionality and integration level compared to more complex multi-cell battery management systems.

Replacement Considerations

Check Texas Instruments datasheets for direct pin-to-pin compatible alternatives within the BQ200x series. Verify if newer revisions offer improved accuracy or additional features while maintaining software compatibility. Ensure any substitute part supports the same I2C protocol and alarm configurations required by the existing firmware.