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bq24232 / about PGOOD pin

Tsukui Yusuke
Guru 21930 points
Other Parts Discussed in Thread: BQ24232

Hi,

Could you tell me about PGOOD pin sink current?

Customer want to use 2.2Mohm register to the PGOOD pull-up.
However,The following contents have been described data sheet.


Is it a problem when using the 2.2MΩ?

Best Regards,
Yusuke/Japan Disty

  • 0
    Guru 21930 points

    Hi,

    Can I get the information?

    If you need more information or if  I should  clarify my comment ,

    please let me know.

    I’m so sorry to rush you but please support this.

    Best regards,

    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Genius 14890 points

    Yusuke-san,

    The bq24232 datasheet shows the range that has been verified and is most typically used.  In general, a 1-kΩ resistor works well to limit the current when an LED is used to indicate Power Good and still allow enough current to light the LED.  The 100-kΩ resistor is the range typically used when used to interface to a micro-controller.

    Your customer wants to use a 2.2-MΩ resistor.  (The question at the end refers to a 2.2-kΩ, but I expect the question is really about the 2.2-MΩ.  The 2.2-kΩ works without issue.)

    I have tested the system with a 2.2-MΩ resistor without issue.  This was not extensive testing, but I do not see an issue with the customer using it.  I will note that this is outside of the specification so the customer must understand that.  When active, the 2.2-MΩ resistor limits the current and creates a very low voltage at the PGOOD# pin.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Guru 21930 points

    Dick-san,

    Thank you for your kind support.
    You are right, kΩ is my typo.
    Customer want to use 2.2MΩ.

    Let me ask you one more thing.
    Please tell me the leak current of the PG pin.
    Customer want the leak currnt data for the application design.

    Best regards,
    Yusuke/Japan Disty




  • 0 in reply to Tsukui Yusuke
    TI__Genius 14890 points
    Yusuke-san,
    I do not have the data for leakage current on the PGOOD pin. I am looking for the characterization data and will reply once I have the correct data.
    Regards,
    Dick
  • 0 in reply to Dick Stacey
    TI__Genius 14890 points

    Yusuke-san,

    My apologies for the delayed response.  There is no specification for the leakage on the PGOOD pin.  Our characterization shows that at 125C and 7V, the leakage will be significantly below 1uA.

    Let me know if this answers your question / requirements.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Guru 21930 points

    Dick-san,

    Thank you for your kind support

    I will report  leakage spec to the customer.

    Thanks.

    Best Regards,