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TPS7A49: [Design review] Integration with BMS 1 cell LIPO

Quentin
Prodigy 60 points
Part Number: TPS7A49
Other Parts Discussed in Thread: TLV758P

Hi everyone,

I'm currently working on a project where I'm designing a battery management circuit based on a single-cell LiPo battery.
The main components of my circuit are the TP4056 for charging the LiPo battery and a TPS7A4901 voltage regulator to maintain a stable 3.3V output to power a STM32 and and 2 LEDs.

I've attached my design schematic to this post. As a begginer, I would greatly appreciate any feedback, especially concerning the integration and performance of the TPS7A4901 in this setup.

Please take a look at my design and let me know your thoughts or if there are any improvements I can make to optimize the circuit.
Let me know if you need any additional information and thanks in advance for your help!

  • 0
    TI__Expert 6570 points

    Hi Quentin, 

    Thanks for posting! It looks like this is configured per datasheet recommendations. 

    What is your input voltage? What current are you driving? 

    BR,

    Erin

  • 0 in reply to Erin Thibeault
    Prodigy 60 points

    Hi Erin,

    First of all, thank you for your review.
    I'll use a 200mAh 1 cell Lipo battery so the voltage will range from 4.2V when full charged to about 3.4V when the LDO regulator shuts off.
    My understanding is that when the battery voltage will decrease to the point the LDO can't work anymore, the whole systen will shutdown and hence I do not need to implement any specific module for this task. Please let me know if my asumption is incorrect.

    Now for the load, i would say max 80mA since it's a very minimalistic design.
    I do not remember seeing many designs like [battery charger] + [LDO Vregulator] + [MCU] often on the net, is it a weird way to do ? If there's any better solution for small sized production (500units) I'd definately like to hear more about it.

    Thank you.

  • +1 in reply to Quentin
    TI__Expert 6570 points

    HI Quentin, 

    Thank you! Your assumptions are correct. 

    I'm curious about why you've chosen an LDO rated to 36V in if you're driving 4.2V max. Have you considered a device like TLV758P?

  • 0 in reply to Erin Thibeault
    Prodigy 60 points

    Hi Erin,

    Thank you for the headsup!
    I picked up this component as it was more documented on internet but just took a look at TLV758P and it perfectly fits my needs.


    That's an updated version of the schematic, please let me know if that sounds right to you.
    Thank you very much.

  • +1 in reply to Quentin
    TI__Expert 6570 points

    Hey Quentin, 

    You got it, this schematic looks good to me. 

    BR,

    Erin

  • 0 in reply to Erin Thibeault
    Prodigy 60 points

    Hi Erin,
    Perfect, thank you very much for your support !
    Have a good day.