BQ29449DRBT

Battery Management Overview

The BQ29449DRBT is a secondary over-voltage protection device designed for lithium-ion and lithium-polymer battery packs consisting of two to four cells in series. It operates within a supply voltage range of 4 V to 25 V and features an output voltage threshold of 8 V. The component functions with a low operating supply current of 2 uA, ensuring minimal power consumption during standby. It is housed in an 8-lead SON package suitable for surface-mount installation. The device supports an extended industrial temperature range from -40°C to +85°C.

Battery Management Feature Summary

• Provides secondary over-voltage protection specifically for multi-cell lithium-based battery configurations.

Battery Management Applications

• Protection circuits for 2-4 cell series lithium-ion battery packs
• Secondary safety monitoring in portable electronic devices
• Battery management systems requiring low quiescent current

Battery Management Procurement Notes

Verify the specific suffix DRBT against official Texas Instruments documentation to confirm the exact tape-and-reel packaging configuration and moisture sensitivity level. Ensure compatibility with the target PCB footprint for the 8-SON package. Confirm that the application environment remains within the specified -40°C to +85°C operational temperature range to maintain device reliability and performance specifications.

Battery Management Selection Notes

Select this component when designing protection stages for 2-4 series lithium cells requiring a dedicated secondary over-voltage safeguard. The low 2 uA supply current makes it suitable for applications where minimizing battery drain during storage or idle states is critical. Verify that the 8 V output threshold aligns with the system's fault response requirements and that the 8-SON package fits the available board space constraints.

Battery Management Part Context

This part belongs to the BQ29449 series of battery protection ICs from Texas Instruments. These components are engineered to provide robust secondary protection layers for rechargeable battery systems. The series focuses on safety compliance by detecting abnormal voltage conditions that primary protection might miss, thereby preventing potential hazards associated with lithium-ion cell failures.

Battery Management Replacement Considerations

Consult official substitution guides for compatible alternatives within the BQ2944x family or equivalent TI battery protection solutions. Verify pinout compatibility and electrical parameter alignment before replacing the component.