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About Input current limit of BQ24259

Gk 110
Expert 2440 points
Other Parts Discussed in Thread: BQ24259

Hello to whom it may concern,

I have a question about Input Current Limit of BQ24259.
If we set following conditions,could you please teach me about behavior of Input Current Limit?
 
　ICHG = 2.048A
　IINLIM = 2A

We want to know about the behavior when IILIM has been set lower than ICHG.
If you have timing chart of Iin & ICHG & IILIM,could you please send us it?
Could you please give me any information?

Best regards,

Manabu Ito

  • 0
    TI__Intellectual 1520 points

    Hi Manabu,

    the input current limit setting simply limits the current from the input source in order to not overload the source itself. This means that the charge current required form the battery cannot increase over the value for which the required input current would exceed the input current limit. 

    The charge current cannot increase further and the IINDPM (Input current Dynamic Power Management) condition is reached, where the device limits the charge current in order not to overload the source. Check section 8.3.2.2 of the datasheet for a complete explanation of the Dynamic Power Management. In the same section, Fig.13 provides the timing information you were looking for.

    Let me know if you have further question.

    Thanks

    Sergio

  • 0 in reply to Sergio Iannace
    Expert 2440 points

    Hello　Sergio-san

    Thanks for your quick reply.
    It isn't written about time sequnence in Fig13.

    When the input current reaches IILIM,how much late is ICHG begin to fall?
    I want to know the specific values.

    Best regards,

    Manabu Ito

  • 0 in reply to Gk 110
    TI__Intellectual 1520 points
    Hi Manabu,
    if you are looking for the precise time sequence, I would need to test it in the lab.
    I will let you know.
    Thanks.

    Sergio
  • 0 in reply to Sergio Iannace
    Expert 2440 points

    Hello　Sergio-san

    Thanks for your quick reply & your kindly support!
    I'm looking forward to your reply.

    Best regards,

    Manabu Ito

  • 0 in reply to Gk 110
    TI__Intellectual 1520 points
    Hi Manabu,
    I operated via I2C changing the input current limit and so forcing IINDPM: the delay between the I2C communication start and the effective drop of ICHG is about 126us
    Hope this helps.

    Sergio