1 to 4 Series Cell Li-Ion Battery Pack Manager Reference Design


Design files


The Texas Instruments bq40z50-R1 device is a Battery Pack Manager that integrates gas gauging, and protection for completely autonomous operation of 1-series to 4-series cell Li-Ion and Li-Polymer battery packs. The architecture enables communication between the fuel gauging processor and an enternal battery charger controller through SMBus broadcast commands.

  • Fully Integrated gauge, protector and charger to support  1 to 4-Series Li-Ion or Li-Polymer cells
  • 2nd Level Protector provides Over Voltage Protection and an integrated 3.3V LDO Regulator
  • Impedance Track Technology
  • Integrated SHA-1 Authentication
  • This circuit design is tested and includes orderable EVM, User's Guide, and evaluation software.
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Design files & products

Design files

Download ready-to-use system files to speed your design process.


Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRJP7.PDF (1656 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery fuel gauges

BQ40Z50-R11-4 series Li-ion battery pack manager supporting Turbo Mode 1.0

Data sheet: PDF | HTML
Battery fuel gauges

BQ40Z50-R21-4 series Li-ion battery pack manager supporting Turbo Mode 2.0

Data sheet: PDF | HTML
Battery protectors

BQ29612-4S Overvoltage Protector with LDO Output

Data sheet: PDF

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Evaluation board

BQ40Z50EVM-561 — 1 Series, 2 Series, 3 Series, and 4 Series Li-Ion Battery Pack Manager Evaluation Module

BQ40z50EVM is a complete system useful for evaluating the functionality of the bq40z50 fuel gauge. As described on the BQ40z50 product folder, this gauge is appropriate for applications powered by multi-cell battery systems. The EVM includes one bq40z50 circuit module, a current sense resistor, and (...)

User guide: PDF | HTML
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Technical documentation

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Type Title Date
* Test report TIDA-00883 Test Results Dec. 15, 2015

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