BQ78350DBT-R1A

Battery Management Overview

The BQ78350DBT-R1A is a companion CEDV fuel gauge and battery management controller from Texas Instruments, designed for use with bq769x0 series analog front-end (AFE) protection devices. It supports 3 to 15-cell lithium-ion and lithium iron phosphate (LiFePO4) battery configurations. The device features the IMPEDANCE TRACK algorithm for precise state-of-charge monitoring and includes comprehensive voltage, current, and temperature protection. It operates within a supply voltage range of 2.5 V to 5.5 V and functions in temperatures from -40°C to +85°C. Packaged in a TSSOP-30 surface-mount case, it utilizes SMBus 1.1 communication.

Battery Management Feature Summary

• Supports COMPENSATED END OF DISCHARGE VOLTAGE (CEDV) fuel gauge algorithm for accurate capacity reporting
• Compatible with bq76920, bq76930, and bq76940 AFE devices for multi-cell battery stacks
• Integrates non-volatile memory for storing battery history, diagnostics, and calibration data
• Provides programmable hardware protection against over-voltage, under-voltage, and over-current conditions

Battery Management Applications

• Light electric vehicles including e-bikes and e-scooters
• Electric garden tools and power equipment
• Uninterruptible power supply (UPS) systems
• Wireless base station backup power
• Telecommunications power systems

Battery Management Procurement Notes

Verify that the specific suffix R1A matches the required revision level for your design, as this indicates a specific manufacturing lot or configuration variant. Confirm compatibility with the associated bq769x0 AFE family selected for the application. Ensure the TSSOP-30 package footprint aligns with the PCB layout. Check for any recent Product Change Notifications regarding material or process updates before finalizing procurement.

Battery Management Selection Notes

Select this component when designing a system requiring precise state-of-health monitoring and cell balancing for 3 to 15-series battery packs. It is suitable for applications needing SMBus 1.1 interface integration with host controllers. Consider this part if the design requires support for both Lithium-ion and LiFePO4 chemistries with integrated protection logic. Ensure the external shunt resistor and AFE selection match the maximum current and voltage requirements of the target battery pack.

Battery Management Part Context

This device belongs to the BQ78350-R1A series of battery management controllers. It is specifically engineered to work in tandem with Texas Instruments' bq76920, bq76930, and bq76940 analog front-end ICs. Together, these components form a complete Battery Management System (BMS) solution. The controller handles high-level algorithms and communication, while the AFE manages cell-level sensing and protection switching.

Battery Management Replacement Considerations

The BQ78350DBTR-R1 is a related variant in the same family but differs in packaging (Reel/Cut Tape vs. Tube). Verify if the reel-based version meets production handling requirements. No direct functional substitutes are documented; alternative designs require re-evaluation of the entire BMS architecture.