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TLV4031: SCH review

Samo Smodiš
Intellectual 362 points
Part Number: TLV4031


Tool/software:

Hello,

I made a crude battery SoC indicator using TLV4031R1s. The intended operation is to turn on the appropriate LED based on the voltage of the battery cell. The schematic is attached and TLV4031s are in the part labelled "Capacity indication".

Can you comment on the design and let me know if it is appropriate or if there are any issues with it?

Thanks!

Samo

0741.SCH.pdf

  • +1
    TI__Genius 12025 points

    Hi Samo,

    A couple of comments:

    There are currently four parallel paths from Vcell to AGND from all of the input resistive dividers. This will drain your battery unnecessarily. It may be more advantageous to use an external voltage reference and resistors to create a voltage ladder and use a quad channel comparator, similar to a flash ADC.

    Other than that, the TLV4031R1 comparators aren't violating any recommended operating conditions. Please make sure that your LEDs are appropriately current limited to protect them.

  • 0 in reply to HO SIU
    Intellectual 362 points

    Hi,

    You are right, the voltage dividers will drain the battery even when it is almost completely discharged. Great suggestion! I will take a look at how to change the design to using a voltage reference.

    Thanks!