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BQ25798: using this ic i want design 5v input ,1 cell (3.7V 1000 MAh) ,what is required components use for design ?

ujjwal gandhi
Prodigy 10 points
Part Number: BQ25798
Other Parts Discussed in Thread: BQ25300, BQ25620

Dear ti team

using this ic i want design battery charger pcb and parameters are given below

input                         : 5V 3A (standard)  and not use PV panel. (on VBUS pin)

 Lithium-Ion Battery : 3.7V 1000 MAH.

output                       : 5V 5A  (on SYS pin ).

suggest me required components for this design .

  • 0
    TI__Guru**** 166996 points

    Hi Ujjwal,

    5V*3A = 15W input voltage cannot provide 5V*5A=25W output voltage.  10W would have to come from the battery.  So I assume the 5A SYS load is only intermittent and will be supplemented by the battery?  If so, BQ25798 I2C controlled charger configured for 750kHz (for highest efficiency) 1S charging might work for you.  If fact, any of our 3A, 1S chargers would work in this configuration so 

    BQ25300 - 3A standalone charger

    BQ25620 - 3A I2C controlled charger

    are other options.

    Regards,

    Jeff