bq24072 - Setting Current Limit

MikeP56977

Other Parts Discussed in Thread: BQ24072

If using one of the USB modes on the bq24072, what should ILIM (resistor on pin 12) be set to? The datasheet on this is confusing. In the pin descriptions on page 6, it states that ILIM is used for EN2=1, EN1=0, implying that ILIM would not be used if one of the USB modes is selected. But it also states, "Leaving ILIM unconnected disables all charging."

over 14 years ago

0 Chris Glaser over 14 years ago

TI__Guru**** 150650 points

I believe table 1 in the datasheet answers your question. The EN pins control a mux that selects from 1 of 4 input current limit settings: fixed USB suspend operation, fixed 500 mA current limit, fixed 100 mA current limit, or current limit adjustable by the ILIM resistor. The block diagram on page 8 also shows this. If you will always be operating in one of the USB only modes, the the ILIM resistor is not needed.

0 MikeP56977 over 14 years ago in reply to Chris Glaser

Prodigy 30 points

Thanks for the reply.

So, the statement that "leaving ILIM unconnected disables all charging" only applies when EN2=1, EN1=0?

0 Chris Glaser over 14 years ago in reply to MikeP56977

TI__Guru**** 150650 points

yes

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bq24072 - Setting Current Limit