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BQ25756: Battery charger IC recommendation

JH Shin
Guru 11050 points
Part Number: BQ25756

Tool/software:

Hello,

My customer is looking for battery charger IC that cant support the two type of battery packs below.

    - Rechargeable Li-ion Pack : 7-series, 2-parallel array / 25.9V 5.7Ah 147.63Wh

    - Rechargeable Li-ion Pack : 7-series, 3-parallel array / 25.9V 10.35Ah 268Wh

Could you please recommend the most suitable product among TI's charging ICs?

Thank you.

JH

  • 0
    TI__Mastermind 31145 points

    Hello JH,

    I have a few questions to help us recommend the right battery charger.

    Can you tell us what the input voltage into the battery charger will be?

    Will the customer need a reverse mode or source mode?

    What will be the battery charging current and the system load?

    Will the customer need any special features like MPPT or dithering?

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Guru 11050 points

    Hello Ethan,

    Thanks for your reply.

    Below are the customer's responses to your inquiries.

    Ethan Galloway said:
    Can you tell us what the input voltage into the battery charger will be?

    - Power source : a DC adapter 20~42V

                               b Solar input using 24V, 120W panel

    Ethan Galloway said:
    Will the customer need a reverse mode or source mode?

    - Please tell me the difference between each mode.

    Ethan Galloway said:
    What will be the battery charging current and the system load?

    - Medium Mode : C/3

    - FAST Mode : C/2

    - System load : none

    Ethan Galloway said:
    Will the customer need any special features like MPPT or dithering?

    - Please provide an explanation or data so that I can understand each function.

    Regards,

    JH

  • +1 in reply to JH Shin
    TI__Mastermind 31145 points

    Hello JH,

    Thanks for the new information. I think the BQ25756/BQ25756E will be the best fit for your application. These ICs can do MPPT or Maximum Power Point Tracking. MPPT is used to find the max power point of a solar panel. The BQ25756 can also handle a 42V input. The BQ25756/BQ25756E ICs can both charge at up to 20A.

    For your inputs, will the charger be charging from both the DC input and the solar input at the same time? If so, I think you could use a BQ25756 in parallel with a BQ25756E to charge a battery. The BQ25756 can charge the battery from the DC input and the BQ25756E can charge the battery from the solar panel input.

    Dithering is a method to reduce EMI. Dithering is most commonly used for automotive applications and I don't think you'll need this?

    Let me know if you have any questions about this.

    Best Regards,
    Ethan Galloway