• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 64 subscribers
  • Views 231 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.

BQ25606: How the output current is divided between SYS and BAT pins?

RAJARSHI ROY
Prodigy 140 points
Part Number: BQ25606

Dear Team,

I was trying to set the output charging current for BQ25606 where I found it's set via the RICHG resistor.

Now, my question is, How is the output current (Fast Charge Current(ICHG)) distributed between the  SYS and the BAT pin? Also, is there an option for setting a constant current at the SYS pin? 

  • 0
    TI__Genius 10385 points

    Rajarshi,

    The device prioritizes delivering the current required by the system load. Assuming sufficient input power and no system load, the device will charge at full charge current. As the system load increases and the available input power becomes limited, the charge current will be reduce to meet the SYS demand. If the input power is not sufficient to meet the system load, the battery will supplement through the BATFET. I have attached a visual illustration of this below.

    The SYS pin outputs a regulated voltage and cannot be configured to be used as a constant current source without the use of external hardware. This external hardware solution would be dependent on your system load requirements.

    Thanks,

    Ricardo

     

  • 0
    TI__Mastermind 25800 points

    Hey Rajarsh,

    The fast charge current is regulated by monitoring current going through the internal BATFET between SYS and BAT. The current is not distrubuted. The charger current out of the BAT pin is provided as set by the ICHG pin until the input current limit is reached. If the system load becomes sufficient to force the input to reach the IINDPM limit, the charging current will be reduced to give priority to the system.

    Regards,

    Joel H

  • 0 in reply to Ricardo
    Prodigy 140 points

    Hey Joel & Ricardo,

    Thanks a lot for your prompt reply. This resolved my issues in understanding.