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Need help for BQ24450

Amit Mane
Intellectual 500 points
Other Parts Discussed in Thread: BQ24450, BQ24650

 

Hi Team,

One of my customer interested to use BQ24450 for Lead Acid Battery

System Load reuqired upto 2A of current.

if available please provide external  power path management circuit for the same.

 

Thanks and Best Regards,

Amit Mane

  • 0
    TI__Guru**** 165886 points

    Can you provide the input voltage and the number of lead acid cells? 

  • 0 in reply to Jeff F
    Intellectual 500 points

     

    Hi Jeff,

    Please find the below details:


    Input Voltage : 18 VDC - 24 VDC

    Output Voltage : 12 VDC ( for System Load)

    Output Current : 2 Amps (for System Load)

    No. of Lead Acid Cell : Single Battery 12V, 7AH.

    Best Regards,

    Amit Mane

  • 0 in reply to Amit Mane
    TI__Guru**** 165886 points

    Going from 24V to 12V at 2A with a linear charge controller results in that controller's external pass FET having to dissipate (24V-12V)*2A=24W.  That is doable with lots of heat sinking and airflow but I think you should consider a buck converter solution.  I wrote an app note using the bq24650 to peform lead acid charging.  The bq24650 is intended for use with a solar panel.  You can easily disable the MPPT functionality of this IC or you can use another member of the bq246xx family with similar external circuitry. 

    The other option is to use a buck converter, like one of the TPS54xxx parts to step down your 18V-24V input voltage to a more manageable 15V or so and then use the bq24450 following the buck converter.