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BQ40Z50-R2: Please recommend Fuel gauge for power bank.

Chase Jeong
Mastermind 7505 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50, BQ4050, BQ34110

Tool/software:

Dear TI experts,

My customer is looking for a fuel gauge for their new application.

The application is power bank for car black box.

Cell chemistry is LiFePO4, and they will use up to 4S4P.

I think that i have to choose between BQ40Z50 and BQ4050, which algorithm is impedance track or CEDV.

I read many threads on E2E about these 2 algorithms, but I still cannot choose which algorithm is the best for my customer.

This new power bank will continuously charged if the car is moving, and discharged if the engine is stopped.

Current consumption would be up to 300mA maximum.

Could you check that which algorithm is the best for this kind of condition?

Best regards,

Chase

  • 0
    TI__Mastermind 28470 points

    Hi Chase,

    For applications that are using LFP cells, we typically recommend the bq4050 with the CEDV algorithm.

    Regards,

    Anthony Baldino

  • 0 in reply to Anthony
    Mastermind 7505 points

    Dear Anthony,

    Thank you for your support.

    I recommend bq4050 as you said, but my customer think that bq4050 has unnecessary features which they do not need.

    (i.e. cell balancing, etc..)

    Instead I would like to suggest bq34110. it is also CEDV algorithm, and only have gauging features.

    Please check that bq34110 is also suitable with LiFePO4 power bank solution.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Mastermind 28470 points

    Hi Chase,

    For this case where there are 4 cells in series, cell balancing is required to provide accurate gauging results. For gauging devices implemented in systems with multiple cells that cannot do cell balancing, it is required to implement a separate IC that can accomplish cell balancing.

    We would not recommend using bq34110 for this application since it is specially designed for end of life systems and will not provide accurate gauging results if used in a standard application.

    Regards,

    Anthony Baldino