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BQ25070

Clive Putman
Prodigy 20 points
Other Parts Discussed in Thread: BQ25070

Is it possible to use the BQ25070 battery charger IC for lithium iron phosphate (LiFePO4) batteries to charge Lithium Polymer (LiPo) batteries, if necessary with some circuit adjustment?  We have BQ25070 designed in and on production line but a supply issue with LiFePO4 battery.  LiPo is readily available.

  • 0
    TI__Mastermind 19820 points
    The charging profile for these two chemistry batteries are different. The bq25070 does not have the typical CC and CV charge controls fro the li-ion battery. Also the battery regulation voltage on bq25070 is 3.7 which is much lower than the regulation voltage for li-ion battery. You li-ion battery will not be fully charged if using bq25070.
  • 0 in reply to Jing Zou
    Prodigy 20 points
    Thanks for the response Jing, but I was really enquiring about Lithium Polymer and the possibility to charge that, but from what I understand it is a very similar technology to Lithium Ion, so I'm pretty sue your comments will apply. Any idea how partial the charge will be and if it is acceptable are there any other ramifications?
  • 0 in reply to Clive Putman
    TI__Mastermind 19820 points

    The bq25070 can be used to partially charge the li-ion battery. The issue is the battery regulation voltage on bq25070 is fixed at 3.7V. Once the battery voltage reaches 3.7V, the charge terminates. This means the li-ion battery cannot be fully charged. Unfortunately, I cannot think of any modification can be done on this device to make it feasible for li-ion battery charging.