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BQ24210: Operating Conditions

Martin Trainer
Prodigy 80 points
Part Number: BQ24210
Other Parts Discussed in Thread: BQ24650

Hi,

I am looking into using the BQ24210 to charge a 4400mAh Li-ion battery from a solar cell.

The specs of the solar cell are:

P_peak = 5.5W peak

V_mpp = 6.0V

I_mpp = 0.9A

V_oc = 7.5V

I_sc = 1A

Based on the specs of the solar cell, at peak power (I have calculated the I_mpp to be >0.8A for around 4hrs of the day), it would be supplying around 5.4W. Assuming 90% efficiency of the charger, it would be charging the battery at around 4.86W/3.7V/1.32A. Under these conditions, the battery charger would be operating at its absolute maximum and the IC is not suited to the application I am intending.

Am I right in how I am approaching this? 

Also, if this is not a suitable control IC, are there any TI solutions that would be suited to this?

Thanks.

  • 0
    TI__Guru* 75786 points
    Hello
    The bq24210 is a linear charger, similar to an linear regulator (LDO) the efficiency will be Vout/Vin. At low current (<1A) and low input to output voltage difference this work well.
    In you case a switching charger with MPPT like the BQ24650 or similar may work better.