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BQ25638: BQ25638YBGR

Anand KN
Prodigy 10 points
Part Number: BQ25638

Tool/software:

Hello support team,

Planning to use BQ25638YBGR - battery charger in one of our design. Need clarification on below points.

1. What is the maximum current at SYS pin with the input of 5V? (Battery not connected at BAT pin)

2. We are measuring 3.8V on SYS (In BQ25638EVM ) , can we increase the SYS voltage. ? If yes , how to increase it and what is the maximum voltage ?

Thank you,

Anand

  • 0
    TI__Prodigy 530 points

    Hi Anand,

    • Since you don’t have a battery connected and you are just using the SYS terminal, I would recommend first to disable charge (set EN_CHG = 0)
    • With charge disabled, BQ25638 will now be in VSYSMIN regulation and can be regulated from (2.56 + 0.23) V – (3.84 + 0.23) V using the VSYSMIN register setting
    • Note that there is a Max input current limit of 3.2A for BQ25638 (IINDPM register) You can also try disabling ICO (EN_ICO = 0) if needed
    • The SYS pin can be loaded upto 5A, given that the input current limit is not reached.
      • So for Vin = 5V, VSYS = 4V, I_IN (max) = 3.2A, the maximum ISYS is about 3.8A
      • For Vin = 9V, VSYS = 4V, ISYS can be loaded upto 5A (because the corresponding I_IN is about 2.5A (which is < 3.2A))
    • It is a good idea to keep monitoring IINDPM and VINDPM status

    Thanks

  • 0 in reply to Shuvam Keshari
    Prodigy 10 points

    Hello Shuvam,

    Thanks for the clarification,

    Can you please suggest a battery charger, which should meet the following requirements,

    1. Should support current on the SYS pin more than 4.5A with input of 5V (Without battery connected on BAT pin)
    2. Charging current (BAT pin) can be more than 0.5A
    3. OTG / USB support is not required for our design
    4. Battery is optional part in our design

    Thanks,

    Anand

  • 0 in reply to Anand KN
    TI__Prodigy 530 points

    Hi Anand,

    I would direct you to this thread here: thread

    Thanks