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BQ24725A: BQ24725A schematic not need DPM

Eddie Chou
Expert 5610 points
Part Number: BQ24725A
Other Parts Discussed in Thread: BQ24725, BQ24750

Hi Team,

My customer plan use BQ24725A as battery charger only not need DPM function,  system power will separate from VBAT but connect to input power directly.

Customer still need measure total input power and manage battery charging current. so system power is also pass through Rac, Is it ok for this design? 

Can team help review customer schematic in attached?  thanks. 

 X103-UP300-12_BQ24725_20220322_2.pdf

Thanks & Regards

Eddie

  • 0
    TI__Genius 11385 points

    Hi Eddie,

    I will take a look at it soon and get back to you.

    Thanks,

    Peng

  • 0 in reply to Pengzhao Zhu
    TI__Expert 5610 points

    Hi Peng,

    Thanks, after discuss with customer. the application circuit diagram is as below, 

    Customer will have PSU module provide two supply voltage, 12V  for system and 16.8V  for Charger. customer's ideal is to measure 12V current and limit (or disable) charging current to maintain PSU total power. They would like confirm with us if below  schematic is ok for this application.

    Btw, customer don't need reverse current protection, but they have tried remove MOSFET from ACDRV /CMSRC and charger doesn't work. is MOSFET necessary for BQ24750 or other place need modify?

    Thanks & Regards

    Eddie

  • 0 in reply to Eddie Chou
    TI__Genius 11385 points

    Hi Eddie,

    They are making a lot of changes.

    For these type of instances, I always recommend testing an EVM. There will be conditions that they don't expect and run into manufacturing issues.

    If they don't want to use ACFET/RBFET, they can try to connect to CMSRC to ACP and leave ACDRV floating. 

    As a note, VSYS cannot be lower than VBAT, otherwise the body diode of MOSFET will turn on. This is a buck charger.

    Thanks,

    Peng