BQ77908DBT

Battery Management Overview

The BQ77908DBT is a multi-cell lithium-ion/polymer precision protector manufactured by Texas Instruments. It supports stacks of 3 to 5 series cells with a maximum operating voltage of 21 V. The device features an ultra-low quiescent current of 48 µA and operates within a temperature range of -40°C to +85°C. Packaged in a 24-pin TSSOP, it provides comprehensive protection against overvoltage, undervoltage, overcurrent, and short circuits.

Battery Management Feature Summary

• Autonomous cell balancing capability for improved pack efficiency
• Stackable architecture allowing multiple devices to manage larger battery arrays
• Integrated HIBERNATE mode for extended standby life in low-power applications

Battery Management Applications

• Portable electronic devices requiring high reliability
• Power tools utilizing lithium-ion battery packs
• Medical equipment with strict safety requirements
• Uninterruptible power supply (UPS) systems

Battery Management Procurement Notes

Verify the specific suffix 'DBT' indicates the tape-and-reel packaging variant distinct from tube-packaged versions like 'PW'. Confirm RoHS compliance status through the official datasheet or environmental files provided by Texas Instruments. Ensure the ordering part number matches the required package type and reel quantity specifications for your manufacturing process.

Battery Management Selection Notes

Select this component when designing systems requiring autonomous balancing without external microcontroller intervention. The stackable feature enables scaling beyond five cells by connecting multiple units. Consider the 24-pin TSSOP footprint for PCB layout constraints. Verify that the 21 V maximum operating voltage aligns with the total pack voltage of the target application.

Battery Management Part Context

This part belongs to the BQ77908 family of primary protectors designed for lithium-based chemistries. It serves as a standalone solution for cell monitoring and protection, eliminating the need for complex host processor logic during fault conditions. The device integrates precision comparators and MOSFET drivers to ensure rapid response to abnormal battery conditions.

Battery Management Replacement Considerations

Direct substitutes include other variants within the BQ77908 family, such as BQ77908ADBT, which share identical functional pinouts and electrical characteristics. Verify package compatibility and thermal performance before swapping between different manufacturer suffixes or alternative TI models in the same product line.