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Original question:

BQ25155: Can we use BQ25150 in place of BQ25155 with same schematic

BQ25155: Drop-in replace BQ25155 with BQ25150

Dushyantha Jayatilake
Prodigy 230 points
Part Number: BQ25155
Other Parts Discussed in Thread: BQ25150,

In BQ25155, pin C3 is an NC, but in the BQ25150, C3 is IMAX and should not be left floating. According to the linked related question, the drop-in replacement could be ok. Can someone please confirm whether this is correct?

Regards,

Dushyantha

  • +1
    TI__Genius 12475 points

    Hi Dushyantha,

    If you are using a BQ25155, going to the BQ25150 would cause issues as the IMAX pin needs to have a resistor connected to it. 

    If you are using a BQ25150 and wanting to drop in a BQ25155, you can leave the RIMAX DNP or leave it as is- there is no concern. 

    Regards,

    Gautham

  • 0 in reply to Gautham
    Prodigy 230 points

    Thanks, Gautham!

    My situation is the former, currently having a BQ25155, but want to replace it due to chip shortage (I could still see some BQ25150s in the market). I see that I'll need to change the PCB if I am to replace it with a BQ25150...

  • 0 in reply to Gautham
    Prodigy 230 points

    Sorry to ask a related question on the resolved thread. I'm just exploring possible future modifications to support multiple chips.

    Currently, my C4 (ADCIN) in BQ25155 is connected to GND directly. What if I route C3 (IMAX for BQ25150) through C4 and then to the RIMAX, which will be around 3k in my case? ADCIN will start to have a small voltage at the start, but I'm not using ADCIN anyway. Is that feasible?

    Regards,

    Dushyantha

  • +1 in reply to Dushyantha Jayatilake
    TI__Genius 12475 points

    Hi Dushyantha,

    I see no concern with having to connect the IMAX pin with the ADCIN pin as the ADCIN pin is a high impedance pin. 

    Regards,

    Gautham