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SM72442: Using the IC without Panel Mode

Philip Wolter
Prodigy 20 points
Part Number: SM72442
Other Parts Discussed in Thread: SM72441, , SM72295

Hi, I am designing a MPPT circuit and want to charge a Li ion battery with it. The charging controller needs a much higher voltage than the panels deliver. Therefore the IC should always be in boost mode, which is possible considering application note: 

Now my question is: Is there anything I have to keep in mind concerning the voltage at pins A2 and A6 if I do not have the panel mode parts connected?

Thanks for your help.

  • 0
    TI__Guru* 78370 points
    As you don't use the Panel Mode, you should consider SM72441. It is almost the same device without the Panel Mode.
  • 0 in reply to Youhao Xi
    Prodigy 20 points
    That is actually a much better IC for our application. Now the only remaining problem is availability. Since I want to build a prototype first I wonder if I can use the SM72442 to have a quick and dirty prototype that uses most of the functions the SM72441 will proivide as well and then later on switch to the SM72441? Of course this will not be 100% compatible but since this is for a university project I can not wait 10 weeks for one chip to arrive and neither TI nor the distributors have this one in stock.

    Any suggestions? Maybe you know other sources than the ones on your distributor list?

    Thank you for your answer, I didn't expect one so quick and it was very helpful :)
  • 0 in reply to Philip Wolter
    TI__Guru* 78370 points
    Sorry I cannot tell the distributor. I think you can prototype with SM72442 and change to SM72441 later.

    Note that the PM_OUT pin of the latter is LED of the former. If you leave this pin open or grounded with a 10k, then you can simply replace the IC without change the PCB.

    PM pin of the latter is the OVP of the former. You should reserve a pull-up resistor for this pin of the latter, to be pulled up by +5VDC., and a jumper to be able to connect SM72441's OVP pin and the OVP pin of the matching driver SM72295.

    Good luck