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Original question:

BQ24103A: Charging a flat battery

Single Cell Li-ion Charging IC Reccomendations for Charging a flat (disconnected) battery that has inbuilt protection

Glen Rayward1
Prodigy 50 points
Other Parts Discussed in Thread: BQ25606, BQ25601, BQ25713, BQ24610

Hi,

We use a Battery which will present 0V to the charger when it has been discharged below 3.0V (self disconnecting)

The Inbuilt Battery Protection needs at least 3.0V to be present to re-activate the Battery Connection to begin charging.

We would like to charge with a max current somewhere between 0.8A and 3A 

We have an input voltage of 5V  (in one case 20V would be useful too)

Does anyone know which Switching Battery Charge ICs can be used for this purpose?

Cheers

-Glen

  • 0
    TI__Guru**** 165886 points

    Glen,

    All of our charger's apply a small current (~50mA-100mA) to BAT when VBAT is below a "battery short" threshold.  This current will charge the capacitor at BAT all the way to VBATREG=4.2V if there is nothing else loading the battery.  Most battery protectors allow this small current in through a diode to trickle charge the battery.  Will this current be enough to close the protector circuit?

    For 5V-15 input, 1S LiIon charger, I recommend the BQ25606 standalone or BQ25601 I2C host controlled switch mode chargers with powerpath and integrated power FETs.  We have a few more integrated FET chargers that will go up to 17V.

    For up to 20V input, 1S LiIon charger, I have to move to charge controllers like BQ24610 standalone or BQ25713 I2C host controlled with external FETs.

    Regards,

    Jeff