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ILIM on bq24250

Samaneh
Prodigy 70 points
Other Parts Discussed in Thread: BQ24250

I have a question about the current limit on bq24250.

According to Table 1, the ILIM can be set to 100 mA by EN2=1 and EN1=0. Does that mean that no external resistor is required on ILIM pin?
The same question arises when we set the ILIM by I2C. Do we still need a resistor for the ILIM pin? If not, then according to the table for pin description, which says "If an external resistor is not desired, short to GND for a 2A default setting", the ILIM would be 2A!
Thanks,

  • 0
    Guru 22270 points

    Hello Samaneh,

    The ILM is the Input charging limit of the USB.  You would set this so that you do not exceed the limits of the USB and ensures USB 2.0 compliance.

    If you use the EN1/2 pins you can set the ILM to 100mA, 500mA or to the externally programmed value (ILM resistor setting) up to 2A.  The details can be found in Table 1 of the Datasheet on page 22. http://www.ti.com/lit/gpn/bq24250

    Thanks,