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BQ24170: Minimum input voltage to charge 3.7V battery at 4.2V charge voltage and 2A charge current.

Karthik B
Expert 1300 points
Part Number: BQ24170
Other Parts Discussed in Thread: BQ25606

Hi,

We are designing a PCB with battery charger IC for 3.7V single cell Li-Polymer battery, Currently We are planning to use BQ24170 battery charger IC in our design.

Let me explain about what is there in our PCB

1.It has a buck regulator at the input side which supports wide range of input voltage ranging from 5V to 24V which gives us the stable 4.5V output.

2.Next this input is provided to the battery charger IC to charge the 3.7V LI-poly battery.

3.The last stage of the PCB is that it has a BOOST regulator that will take 3.7V battery input as well 4.5V from the above buck regulator(this is when the external adaptor is connected) to produce 5V, 3A output power.

Now my concern is that whether 4.5V is sufficient for the battery charger to charge the battery at 4.2V , 2A charge current?

Also suggest what is the minimum input voltage that is required to charge the 3.7Vbattery?

Please suggest we are choosing a buck regulator that provides enough current for the operation.

Request you to reply this ASAP.

Regards,
Karthik