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bq24113A input vs charger voltage

David Zepp
Prodigy 10 points
Other Parts Discussed in Thread: BQ24113A, BQ24105, BQ24103

I'm looking at the bq24113A to charge a 7.4 2cell Li-Ion battery. The datasheet has an min input V of 4.3V and the datasheet only list efficiency graph if teh input V is higher than the charge V. Is there a requirement of Vin to be higher than Vcharge? I can;t find that specific info in the datasheet.

  • 0
    Prodigy 160 points

    It does not explicitly say in the datasheet, but the bq241xx family of synchronous charger ICs are of buck (step-down) topology. So Vin does indeed have to stay above a given voltage (with respect to Vout).  I've used both the bq24105 and the bq24103 in a few different designs, and they do work very well though. Specifically, for charging a two (series) cell configured Li-ion battery pack, I used the bq24103. So if you can provide a 12V input voltage to the IC (there are sample calculations in the datasheet too), you should be fine.

    Hope that helps!

    -Apostolos K.