• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 862 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25120: VIN/PMID Configuration question..

Amanda Ross95
Intellectual 2740 points
Part Number: BQ25120


Hello there,

I have a customer using this device in their system. In the functional block, the only thing separating PMID and VIN is a FET. The customer was wondering if there is any (un-shown) boost regulation circuitry between those two pins and would like to know the consequences of connecting them externally (as PMID is shown as an I/O on the datasheet)?

Would this just bypass battery supplement mode or would there be other effects?

Thanks for your time,

-Amanda

  • 0
    TI__Expert 3350 points

    Hello Amanda,

    PMID is an unregulated load pin which can supply up to 300mA. Connecting this to VIn would bypass the input FET that is used for protection and high-Z mode.

    Your BAT and VIn would also connected directly through the Battery FET (Q7).

    Regards,

    David

  • 0
    TI__Intellectual 2050 points
    Hi Amanda,

    What is the reason behind tying VIN to PMID?

    PMID and VIN should not externally tied together.

    This will bypass the input current monitoring, which will affect VINDPM and ILIM.

    Also, if any load is on PMID it will no longer be protected from an over voltage condition because PMID is externally connected to VIN.

    Also, this may keep the device from being in Active battery/ supplement mode.

    -Joe