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Questions about bq24105

Hector Torres60512
Prodigy 10 points
Other Parts Discussed in Thread: BQ24105

Hi, I will try to charge a 3-cell li-po battery and i been thinking in doing it with the bq24105 and i have some doubts.

 

- My source have the voltage, but i only can get 300~400 mA, is it possible to charge the battery with this IC (the time is not crussial) ?

- How the cells are conected to the IC? independently  with the 4 pin conector or all with the 2 pin conector?

- Where can i could find a schematic where shows this IC charging a 3-cell li-po battery and how calculate all the component values?

 

I hope that someone can help me.

Thanks for your time.

  • 0
    TI__Guru**** 150830 points

    Yes, the bq24105 can be set to charge the batteries with any amount of current between 150 mAand 2A.  Note that the input current from your source will be less than the output current going into your batteries.  This is because the input current to a buck converter is less than or equal to the output current, depending on Vin, Vout, and the efficiency.

    The user's guide for the EVM can be configured to charge a 3-cell pack: http://focus.ti.com/lit/ug/sluu200a/sluu200a.pdf

    I would order the EVM for the bq24105 and evaluate it.

    I am not sure what your question on the connector is.  The output of the charger is connected directly to the positive side of the pack with the pack return connected to ground.  The bq24105 can also use a thermistor between TS and GND.  The EVM is configured to be used without a thermistor.