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BQ24040: Consequences of Programmed Current below 50 mA

Mark Blackburn
Prodigy 40 points
Part Number: BQ24040
Other Parts Discussed in Thread: BQ25100, BQ25170

I want to know what the consequences of setting the ISET programming current below 50 mA is. We want to set our programmed current to 41.5 mA mA by using a 13 kOhm resistor. The reason we want to do this is that our power supply isn't specified for 50 mA.

So why is the lower limit 50 mA? Is there something else that goes out of spec (pre-charge current or termination current)? Or is the programmed current not quite what you set it to.

Alternatively we could try setting the programmed current to 50 mA but our power supply would likely drop below 5V. Would the BQ24040 work OK in this scenario.

  • 0
    TI__Guru 67866 points

    Hello

    The BQ24040 can be used at lower charge current but the current regulation accuracy decreases, this can be seen in K-ISET tolerance.  A device that works well at lower charge current is the BQ25100 it is WCS package.  Also he BQ25170 in QFN package has a tighter low current accuracy.

    BUT -- the BQ24040 has input DPM, if the input voltage starts to drop it will reduce output current to continue operation this may help.