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BQ24780S: bq24780S : NiCd Battery 6 Cell

EASHWAR ARIVAZHAGAN
Intellectual 315 points
Part Number: BQ24780S

Dear Sir/Madam,

This is my first design in battery charger domain. I have to charge 6 AA cell Ni-Cd Battery of 700mAh to 1000mAh. All the six cells are connected in series to get 7.2V (max).

I have chosen BQ24780S as charger IC, since it is buck converter (adapter input is >= 9V), protection features and SMBus interface for design flexibility. But the datasheet says only 1 - 4 cells.

Does  1 - 4 cells will have impact in my design, since my current and voltage rating are well below charger absolute max. rating.

Kindly clarify.

  • 0
    TI__Genius 11850 points

    Hi Eashwar,

    The "1 to 4 cells" comment in the datasheet refers to Li-ion battery charging. The BQ24780S's charge voltage range is 1.024 - 19.2 V. Li-ion batteries are typically charged at 4.2 V/cell, so this charge voltage range is suitable for charging a Li-ion battery with up to 4 cells.

    This will not be a problem for you since, as you said, your battery voltage is well below the BQ24780S's max charge voltage. The BQ24780S will work for your application. Just be aware that the BQ24780S is host-controlled, so the host must set the charge current, charge voltage, and other parameters through SMBus.

    Best regards,

    Angelo