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BQ24650: Choosing the right IC for Solar powered and Grid powered application| Lithium Iron Phosphate battery charger

Kay Minhas
Prodigy 80 points
Part Number: BQ24650
Other Parts Discussed in Thread: BQ24620,

Hi,
I am designing a Battery Charge controller for our 12V LiFePo battery.

Power input is:

a. Solar Panel 80W @ 12V (Link, Vopencircuit=21.33V, Vmaxpower=17.78V) OR

b. 18VDC grid power.

Either one power input will be selected at time of deployment, so PCB should be able to handle both cases.

Question: Which of the following IC is better for the application, BQ24650 or BQ24620? What is the difference between these ICs?

Battery specs: Charge Voltage=14.3V, 4 cell Lithium Iron Phosphate, Vout=12V

This is my first time design a Solar panel powered circuit. Thank you.

  • 0
    TI__Genius 14360 points

    Hi Kay,

    There is a helpful document for explain BQ246xx series difference in ti.com, link is shown here SLUA579.

    If you have no special concern,BQ24650 will be the better choice since it support both PV MPPT and LiFePO4 battery. 

    Best regards,

    Ann Lien