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charging 6 LI-POs

Boothby
Prodigy 130 points
Other Parts Discussed in Thread: BQ2954, BQ24610

Hello,

Looking for a simple 1 chip solution to charging a 6-cell li-po battery pack. The supply will vary enough to drop below batttery supply so controller will be interrupted much of the time.   thanks - Boothby

  • 0
    Prodigy 10 points

    Hey there....

    I am looking for the same thing..I am lookin for a Charging circuit not a single chip solution but something like that ......I want a circuit/chip which can be used to build a charging system where you can just  plug it in and then input the voltage...

  • 0 in reply to Eobin George
    TI__Guru**** 150760 points

    We just released the bq24610, which supports up to 6-cells.  We also have the bq2954, which supports any number of cells.

  • 0 in reply to Chris Glaser
    Prodigy 130 points

    Chris - Excellent.  What a great company to offer this level of support so quickly.  Keep up the good work. thanks Boothby

  • 0 in reply to Chris Glaser
    Prodigy 130 points

    Chris,

    have the bq24610 chips and built a prototype of a 6-cell Li-Po charger.  Having troubles with one mode of its operation otherwise appears to work as described in the datasheet.  The issue comes when 1) the battery is removed from the system, and 2) the adapter voltage is below the charging level for the batteries (if present).  In this configuration, the system voltage is alternating between the adapter voltage and zero ( 5-10Hz) and the power-good led is in sync at the same rate.  The stat1 led is on, stat2 is off indicating charging.  Charge enable is tied to 3.3V.  If the adapter voltage is where it would charge the batteries, then no issues. system power is stable when batteries are removed and charges when batteries are present, and batteries supplies power when adapter voltage is below.  Could you shed any light on the issue?  thanks -todd

  • 0 in reply to Boothby
    TI__Guru 56650 points

    bq24610 EVM will be released in a week or two. You can order it very soon.

    bq24610 has sleep mode protection which can explain what you saw. When battery is removed from the system; the adapter voltage is below the charging level and CE is high, the charger still charges output up. When the output voltage is close to input, it runs to sleep mode and turns off ACFET.

    In general, input voltage needs to higher than battery's Voreg. If input voltage is lower Voreg set point and no battery, we still want keep ACFET on, please add a input voltage comparator to control CE pin. If the input voltage is lower than Voreg set point, the comparator pulls CE to low.

     

  • 0 in reply to Wang5577
    Prodigy 130 points

    Thanks for the response. Knew it wasn't the undervoltage or overvoltage. so that left the sleep mode.  From the control flow diagram, it just had a simple block for battery detection.  Good suggestion with the comparator.