Product details


Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells 2-4 Cells, Single Cell Communication interface SMBus Battery capacity (Min) (mAh) 500 Battery capacity (Max) (mAh) 29000 Implementation Pack External capacity indication LED Features CEDV algorithm, Cell Balancing, Integrated Protector, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing Internal open-in-new Find other Battery fuel gauges

Package | Pins | Size

VQFN (RSM) 32 16 mm² 4 x 4 open-in-new Find other Battery fuel gauges


  • High-Side Protection N-CH FET Drive Enables Serial Bus Communication During Fault Conditions
  • Cell Balancing with Internal Bypass Optimizes Battery Health
  • Diagnostic Lifetime Data Monitor and Black Box Recorder for Failure Analysis
  • Full Array of Programmable Protection Features: Voltage, Current, Temperature
  • JEITA Charge Algorithms Support Smart Charging
  • Analog Front End with Two Independent ADCs
    • Simultaneous Current and Voltage Sampling
    • High-Accuracy Coulomb Counter with Input Offset Error < 1 µV (Typical)
  • Supports Battery Trip Point (BTP) Function for Windows® Integration
  • LED Display for State of Charge and Battery Status Indication
  • 100-KHz SMBus v1.1 Communications Interface for Programming and Data Access with Alternate 400-KHz Mode
  • SHA-1 Authentication Responder for Increased Battery Pack Security
  • Compact 32-Pin VQFN Package (RSM)
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The Texas Instruments bq4050 device, incorporating Compensated End-of-Discharge Voltage (CEDV) technology, is a highly integrated, accurate, 1-series to 4-series cell gas gauge and protection solution, enabling autonomous charger control and cell balancing.

The bq4050 device provides a fully integrated pack-based solution with a flash programmable custom reduced instruction-set CPU (RISC), safety protection, and authentication for Li-Ion and Li-Polymer battery packs.

The bq4050 gas gauge communicates via an SMBus-compatible interface and combines an ultra-low power, high-speed TI bqBMP processor, high-accuracy analog measurement capabilities, integrated flash memory, an array of peripheral and communication ports, an N-CH FET drive, and a SHA-1 Authentication transform responder into a complete, high-performance battery management solution.

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Technical documentation

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Type Title Date
* Data sheet bq4050 CEDV Gas Gauge and Protection Solution for 1-Series to 4-Series Cell Li-Ion Battery Packs datasheet (Rev. B) Oct. 09, 2017
* User guide bq4050 Technical Reference Manual Apr. 01, 2016
User guide Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC) (Rev. B) Jan. 30, 2018
Technical article How to choose a multicell gauge Dec. 16, 2016
User guide bq4050EVM-561 Evaluation Module User’s Guide Mar. 30, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
BQ4050EVM is a complete system useful for evaluating the functionality of the bq4050 fuel gauge using the CEDV gauging algorithm. As described on the BQ4050 product folder, this gauge is appropriate for applications powered by multi-cell battery systems. The EVM includes one bq4050 circuit module, a (...)
  • Populated circuit module for quick setup
  • Software allows data logging for system analysis
  • Complete evaluation system for the bq4050 battery management IC

Software development

Production tool for 4th generation multicell battery fuel (gas) gauges
BQPRODUCTION bqProduction offers a full suite of robust tools to assist with the process of configuring, calibrating, manufacturing and tracking printed circuit boards utilizing TI Battery Battery management products. This includes features that allow writing a golden image followed by different types of (...)
  • Support for the EV2300 Works with Advanced bqMTester hardware
  • Control multiple stations from a single graphical user interface
  • Run up to 12 stations in parallel from a single computer
  • Uses industry standard Motorola srec format Golden image programmer
  • Calibration and test automation Unique Serial number (...)
Battery Management Studio (bqStudio) Software
BQSTUDIO Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)
  • Real-time Gauge Dashboard for monitoring basic registers
  • Full register access and logging
  • Full data memory access and logging
  • Product configuration and monitoring tools
  • Import and export of product configurations
  • Calibration and test automation
  • Export of FS files for the target production environment 
Gauging Parameter Calculator for CEDV gauges
GPCCEDV Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over (...)

Reference designs

Non-Military Drone, Robot, or RC 2S1P Battery Management Solution Reference Design
TIDA-00982 — This reference design is for a 2S1P battery management solution (BMS) for non-military drone, robot or radio controlled (RC) projects and designs. Quickly add gauging, protection, balancing and charging to any new design for a non-military drone, robot or RC product or use this reference design to (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RSM) 32 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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