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Limit current for Li-Ion battery charging

VT
Genius 3300 points
Other Parts Discussed in Thread: BQ25700A, BQ25703A, BQ24725A, BQ24610, BQ24170

1. I have a 11.1V/4.4Ah lithium battery, whose full charge voltage is at 12.6V

2. there is separate 12.6V/5A adapter in the instrument where we need to fit the battery.

3. Goal is that if mains is not availabel, system switches to battery & if main is present, it both charger battery with 1.5A & supply current to load also.

4. Adpater is not itself current limiting, so it will send over current to battery, what is right way to limit current in battery so that it wont take more than 1.5A for charge.

  • 0
    TI__Guru 56650 points

    You can check http://www.ti.com/power-management/battery-management/charger-ic/products.html to find the right charger IC or change your setup.

    According to your request: a multi-cell Li-ion battery charger with power path selector IC should be good for you.

    Next: does the system have a MCU with I2C or SMBus? If it does, you can pick SMBus/I2C charger.

    Also, the input voltage is 12.6V and the charging voltage is also 12.6V. We have to use a buck boost charger to charge battery to full capacity unless you increase the input voltage to 15V. The buck boost charger is bq25700A (SMBus) or bq25703A (I2C).

    If you increase the input voltage to 15V, you have many buck charge options: bq24610 (stand alone); bq24170 (stand alone with integrated switching FETs); bq24725A (SMBus).