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BQ40Z50: BQ4050 VS. BQ40Z50 FOR LIFEPO4 BATTERY

UMAR IJAZ
Prodigy 40 points
Part Number: BQ40Z50
Other Parts Discussed in Thread: BQ4050, , BQ41Z90,

Tool/software:

Hi, 

I was looking into designing a battery management PCB and wanted to know which of the ICs in the title to use. 

From my understanding, both ICs can be used but the BQ4050 (using the CEDV gas gauging algorithm) is not recommended for new designs?

Any insights into helping me make the decision as to which IC would be more applicable will be greatly appreciated.

  • 0
    TI__Mastermind 26115 points

    Hello Umar, 

    The biggest factor to determine what IC you should use for LIEP04 is how many in series you are considering to use. out of the two you list I would recommend using BQ40Z50-R2 due to it using impedance tracking which is TI algorithm in determining the voltage of the cell. However, if  you are consider having many cells in series than consider the new BQ41Z90 that is able to go up to 16 cells in series.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 40 points

    Thanks for getting back to me Alan.

    I'm an applications engineer at a battery company and our only two options are BQ4050 and BQ40Z50-Rx for our LIFEPO4 batteries. 

    The internal structure of our LIFEPO4 batteries ranges from 4 or more series cells.  

    From my understanding, the impedance track algorithm - used by the BQ40Z50 - is generally more accurate versus the compensated end of discharge voltage i.e. CEDV algorithm used on the BQ4050 batteries.  

    Am I correct in saying this?

  • 0 in reply to UMAR IJAZ
    TI__Mastermind 26115 points

    Hello UMAR, 

    You are right about the BQ40Z50 and BQ4050 and impedance track algo being more accurate for the end of discharge voltage. However if you are planning in using 4 more cells than considered the recently release BQ41Z90 that is able to monitor up to 16 cells individuality.

    Thank you,
    Alan