BQ78350DBT

Battery Management Overview

The BQ78350DBT is a companion CEDV fuel gauge and battery management controller from Texas Instruments, designed to work with the 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 provides precise gas gauging, state of health monitoring, and cell balancing. It features an SMBus 1.1 interface for data communication and includes non-volatile memory for storing battery history and diagnostic data. The component operates within a temperature range of -40°C to +85°C and is housed in a TSSOP-30 package.

Battery Management Feature Summary

• Implements Compensation End-of-Voltage (CEDV) fuel gauge algorithm for accurate capacity reporting
• Supports up to 320Ahr battery configuration and up to 320A charge/discharge current via compatible AFE
• Integrates security hash algorithm (SHA-1) authentication for secure data access
• Provides programmable protection arrays for voltage, current, and temperature system elements

Battery Management Applications

• Light electric vehicles including eBikes, eScooters, and Pedelecs
• Electric and gardening tools
• Uninterruptible power supply (UPS) systems
• Wireless base station backup systems
• Telecom power systems

Battery Management Procurement Notes

Verify the specific suffix variant (e.g., DBTR vs DBT) against project requirements, as packaging formats differ between tape-and-reel and tube options. Confirm that the selected part number aligns with the intended mass production programming needs, as data memory programming procedures may vary. Ensure compatibility with the designated bq769x0 AFE family for proper system integration and communication protocol adherence.

Battery Management Selection Notes

Select this component when a complete battery management subsystem is required alongside TI's bq769x0 AFE protectors. It is suitable for applications demanding high-precision state-of-charge estimation using the IMPEDANCE TRACK technology. Consider its SMBus interface capabilities if host communication and display driving (LED/LCD) are necessary. Validate that the supported cell count (3-15) and current ratings meet the specific battery pack specifications.

Battery Management Part Context

The BQ78350 belongs to the bq78350-R1 series of battery management controllers. It is specifically engineered to complement the bq76920, bq76930, and bq76940 analog front-end devices. This combination forms a comprehensive battery management solution for multi-cell lithium-based batteries. The controller handles the complex algorithms for fuel gauging and system monitoring, while the AFE manages cell-level protection and measurement.

Battery Management Replacement Considerations

Public confirmed substitute part numbers: None.