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Battery Charging solution

John66881
Prodigy 10 points
Other Parts Discussed in Thread: BQ24075, TPS63001, BQ24190

Hi Good Day!

I'm working on  a 3.3V Handheld system with estimated max possible current consumption of 1.2A. We'll be using a 3.7V  2200mAh  Li-Ion battery. We need a solution to charge the battery using a 12V supply from a charging system. To extend the Battery life, While charging we would like to draw current from the 12V supply for the handheld system's load.

So far this is  the solution that i thought of:

with 12V input to bq24075 (with the battery connected as specified at specs.).  connect bq24075's output to  TPS63001 to have a regulated 3.3V output capable up to 1.5A.

Please confirm if this is an efficient solution that my satisfy the above requirements. So far As checked, this is quite an expensive solution. Can you please suggest a cheaper and efficient solution.

 

Thanks,

John

 

  • 0
    TI__Guru 56650 points

    The input OVP of bq24075 is only 6.6V. It is not good for 12V input. Also, if the current consumption is 1.2A and input is 12V, I would recommend a switching charger.

    Please check bq2417x or bq241xx family parts. Does the system need to work when only input adaptor is avaible and without battery? if it is, we have to add some circuit to handle a non-battery condition or a deeply discharged battery condition. Probably, half year later, when bq24190 is released, we don't need an extra circuit to handle a non-battery condition or a deeply discharged battery condition. If the system don't need to work without a battery, the design is easy. Just put the system load on the charger battery output.