This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM2903: LM2903DR and LM2903BIDR

Part Number: LM2903

Tool/software:

Hi TI Team,

Could you please help to check below questions?

1.What’s the max supply current of LM2903DR and LM2903BIDR?

2.What’s the max quiescent current of LM2903DR and LM2903BIDR?

Thanks!

  • Hello Chen,

    This is stated in data sheet, under IQ spec.

    What’s the max quiescent current of LM2903DR and LM2903BIDR?

    It is 2500uA, and 800uA

    What’s the max supply current of LM2903DR and LM2903BIDR?

    Do you mean maximum ground pin current because of heavy load on both outputs?

  • Tonny---I mean the maximum VCC pin current because of heavy load on both outputs.

    Is the Ground pin current higher than VCC pin current because of IN-/IN+ current?

  • Chen,

    Input current is IIB, which is nano amperes, is insignificant and part of data sheets IQ. If inputs go below ground, note 5 suggests most of the current comes from VCC. -50mA is the input abs max and a bad application design if that happens. If multiple pins do that at the same same, that's a horrible design. At that point the maximum junction temperature will be quickly reached. Hopefully, this is not what you are asking.  

    The outputs are open collector so output current can only go to GND pin. So output current doesn't add to IQ, current at VCC pin.  

  • Hi Ron,

    That is not what I'm asking.

    What I want to know is the maximum working current of VCC pin.

    Is it the total supply current?1~2.5mA?

  • Hi Ron,

    When the VCC is 9V, what is the maximum working current of VCC pin?

    Why LM2903 only have ICC value, but no IQ value in the data sheet.

    Why LM2903B only have IQ value, but no ICC value in the data sheet.

  • Chen,

    IQ = quiescent current, this is the current that flow from positive supply to negative supply under no load condition, so it is the lesser of ICC and IEE.  ICC = current current that flow into positive supply pin under no load condition.  The only difference is the insignificant magnitude input bias current. For all practical purposes both terms are the same thing. 

    At 9V, maximum ICC and IQ will be between the two maximum listed. You can interpolate the Supply Current vs Supply Voltage chart against maximum limits to estimate how much. This would only be an estimate.