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BQ24125: Review my LI-ion battery charger layout and schematics

navneet pandey
Prodigy 30 points
Part Number: BQ24125

Hello everyone,

I have a question regarding my design which uses the BQ24125 Standalone 1-3 cell 2A synchronous Buck battery charger with enhanced EMI performance to charge an 11.1V 5.2Ah Li-ion battery. Currently, I am using a 15V SMPS bench supply to charge the battery, but I am unsure about the accuracy of my schematics and layout. I am using an optocoupler to monitor the status and PG output from the charger on the MCU. Could someone please review my design and offer any suggestions? Additionally, I am wondering if a 2-layer board would be sufficient for the layout. I have attached screenshots of my schematics and layouts from different layers for your convenience. I have referred to the EVM module and datasheet, but I am still uncertain about my design. Thank you in advance for your help.

  • 0
    TI__Guru**** 152876 points

    Hi Navneet,

    The current sense resistor and output capacitance seems a bit low when compared to the table below:

    I do not see any other issues with the schematic. 

    A 2-layer board should be okay.  Your current layout will likely work as it is very similar to the EVM.  However, we found from other customers that for absolute lowest EMI, the input capacitors should be laid across the top of the IC for shortest connection to ground.  This means that the OUT pins need to via down to get to the inductor.

    Regards,

    Jeff