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bq24072T Source supply

PIerluigi Rossetti
Intellectual 350 points
Other Parts Discussed in Thread: BQ24072T, BQ24266

Hi team,
I'd like do a simple question, I have a Input 12V on my system and I must to charge a battery at 4.2V, and  plus to have max 5V out  2A max for supply another wireless device..
I thought at the device bq24072T,  is it possible to use this device?  
Is there a  Application note?
Thank a lot
Pierluigi

  • 0
    TI__Guru*** 146695 points

    The bq24072T's maximum operating input voltage is 6.4V and the maximum output current is 1.5A.  I do not recommend using a linear based charger to provide 2A due to the excessive power dissipation, (12V-5V)*2A = 14W, that the linear regulator would not be able dissipate without entering thermal protection and lowering the input current limit.  A buck switching based charger like bq24266 might be a better option.  It provides 3.4V to 4.2V on the SYS output voltage.