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IC selection

Anatoly Petrov
Prodigy 20 points
Other Parts Discussed in Thread: BQ24072, BQ25895, BQ25606, BQ25601

Hello.

I need to select li ion (1-cell) charger with temperature control that can provide system power when temperature is out of li ion charging range.

  • 0
    TI__Guru**** 165776 points

    Hi Anatoly,

    I can help! What is the battery's capacity (or your desired max charge current) and the input power voltage range? Do you want to charge in the standard temperature (0-45C) range or JEITA (0-60C) range, which modifies the charge profile below 10C and above 45C?

  • 0 in reply to Jeff F
    Prodigy 20 points
    Hi, thank you for reply.
    Capacity is 3000mAh, but i dont need high max current, below 1A will be good. I need the standard temperature range. Input voltage is 12-28, i am ready to use some external step-down, if needed.
    The most important thing is that i need to have system power, even battery discharged or not present and temperature is below 0C or above 45C.
  • 0 in reply to Anatoly Petrov
    TI__Guru**** 165776 points
    Anatoly,

    I recommend an external step down converter. If the step down converter is in the 5-6V range, then you can use a linear regulator based charger like BQ24072 or one of its family members. See family members in the datasheet www.ti.com/.../bq24072.pdf.

    Different versions provide different system voltages all the time depending on the input voltage.

    If you want more efficiency and have I2C communication, you could use the BQ25895 switching based regulator. It is one of the few switch based chargers that both provides a system rail (at least 3.0V-3.7V as set by I2C then follows the battery up to 4.2V) but only charges the battery between 0 C and 45C.

    Most of our switching chargers use the JEITA temperature range to charge. Keep in mind, the system rail is provided regardless of temperature. It is only the charging that is limited. It JEITA charging is okay for you, then I suggest the standalone BQ25606 or its I2C sibling BQ25601.

    Regards,
    Jeff