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BQ34z100-G1 vs BQ20z75-v180

Teach Me
Expert 1940 points
Other Parts Discussed in Thread: BQ20Z75-V180, BQ34Z100-G1, BQ40Z50-R1, BQ27500-V130

I'm currently looking on battery fuel gauge.

I came across BQ34z100-G1 and BQ20z75-V180. After reading the datasheet, i still confuse on the different between these 2 parts.

As i know, for BQ20z75-V180 supports the SMS v1.1 and no learning cycle.

Beside this, is there any differences? I plan to charge the Li-Ion battery for portable instruments.

For BQ20z75-V180, the datasheet stated that it is not recommended for New Design.

It this parts yet to be launched?

Please advice.

  • 0
    TI__Guru 73830 points
    Both devices use the Impedance Track gauging algorithm to track cell aging and predict the capacities. The bq20z75 is a very old device and it is NRND and replaced with the bq40z50-R1. The bq40z50-R1 supports up to four series cells and included an AFE for cell monitoring and protection. The bq34z100-G1 does not monitor individual cells, but it can support up to a 65V stack voltage and it just provides gauging.
  • 0 in reply to ThomasCosby
    Expert 1940 points

    Hi Thomas,

    Thanks for the answer...

    So, for our project, we decided the below requirements:

    Battery Type: Lithium Ion

    Battery Dimensions: 18650  (18mm Diameter, 65mm Length)

    Topology - Parallel (1s2p, 1s3p or higher)

    Requirements

    - Should be able to charge evenly, and use batteries evenly.

    - Protection circuit for Short, Overcurrent, Overvoltage, Overtemperature etc.

      If one battery damaged, no change to circuit, remaining batteries operate as usual.

    - Should allow charge state to be measured accurately.

    - Maximize the number of cycles. Accurately charge to required max voltage.  

    Details

    - 4.2V Max Output for Charger.

    - Allows either USB or DC voltage input to charge. (suggest switch mode ??)

    - Allows charging while operating.

    - Pre-charge, CC, CV, Terminate. Charge evenly all batteries at 1C or less at same time.  

    - Battery Gauging

      - Should account for load/no load, temperature variation.

        (TI has 'Impedance Track' feature & Voltage Profile Database)

    For  bq40z50-R1 fuel gauge, it is supports up to four series cells.

    We also looking at the BQ27500-v130....

    Can it be used to monitor the battery system as proposed?

    But we plan to charge the battery in parallel as mentioned above.

    Is there any suitable battery charger or fuel gauge that fulfill the requirements?

    Please refer attachment: