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Original question:

BQ25606: Whether Ilim has influence on Ichg

BQ25606: ILIM setting

Noah Kim1
Prodigy 20 points
Part Number: BQ25606

Hi.

My custom board will receive the power from usb type C port. When charge current is set to 3.0A, 88% of charge efficiency is shown in the datasheet. 

Efficiency = Pout/Pin = VSYS*(ICHRG+ISYS) / VBUS*IBUS

             0.88 = (3.6V x 3A) / (5V x IBUS) 

             IBUS = 2.45A 

And, According to datasheet, USB input current regulation limit(max) is 500mA.

Then, should I set input current limit greater than IBUS? Or Should it be less than 500mA.

Thanks.

  • 0
    TI__Guru 57501 points

    Hi,

    The input current limit should be higher than normal input operating current with acceptable margin.

    Depending on the USB types, USB CDP can support up to 1.5A, USB DCP can support much higher input current limit.

    Thanks,

    Ning.