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OPA391: What does "Output short circuit" absmax mean and what does "continuous" capability mean?

Yoshiki Ochi
Expert 7585 points
Part Number: OPA391

Hi team, 

What does "Output short circuit" absmax mean and what does "continuous" capability mean? 

OPA391 shows its absmax output short circuit as "min: continuous" and "max: continuous". On the other hand, TLV900x says absmax output short circuit as min: continuous and max: no specification. 
How should we use these difference and what is TLV900x bottle neck compared with OPA391 in aspect of output short circuit condition? 

In addition, Both of OPA391 and TLV900x have "short circuit current" typical value at VS=5.5V shown in "Electrical Characteristics". 
Do you have test circuit diagram? Which circuit did you measure this current value?

Regards,
Ochi

  • +1
    Guru 243570 points

    There is no practical difference. If there were a numerical limit, you could say that the minimum would be −123 mA, and the maximum, 123 mA; or alternatively, that just the maximum would be ±123 mA. When there is no limit in either direction, it does not matter how you say that there is no limit.

    The short-circuit current is measured with the output trying to drive to either rail, but forced to ground. This value should be measured in both directions, but the OPA391 datasheet specifies only what appears to be the sink current. (Figures 6-16 and 6-17 show that source and sink drive strength are different.) (For the TLV900x, the curves in figure 7-12 stop before showing a short circuit, but the short-circuit current is shown in 7-33.)

  • +1
    TI__Mastermind 47966 points

    Hi Yoshiki-san,

    What does "Output short circuit" absmax mean and what does "continuous" capability mean? 

    Clemens has explained the meaning of short-circuit. In addition to the comments:

    When the output pin of OPA391 or TLV900x is shorted to ground (one op amp per package), the op amp is able to sustain the heat dissipation internally without damaged under the recommended operating temperature. In the datasheet, the maximum current load figures are specified at 25C or room temperature. As specified, the rated output load current is capable of source or sink at the output pin, which an op amp is designed for. The typical current load plots are empirically determined. 

    If you have additional questions, please let us know.

    Best,

    Raymond