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OPA4376: output current rating

Rupesh Gelani
Prodigy 30 points
Part Number: OPA4376

Dear sir/mam,

We are using opa4376 for as voltage follower circuit. we are providing Vs = 3.3V and maximum Output voltage is 2.9V.

We want to know maximum output current it can provide at Output voltage = 2.9V at 70°C temperature.

We have followed below chart from datasheet of opa4376 but its not providing data at Vs=3.3 V.

Please reply as soon as possible

Thanks,

Rupesh

  • +1
    Guru 47485 points

    So this claw curve is essentially a headroom plot, you are asking for a condition that requires 0.4V headroom. So that would be 2.35V in the plot above for a nominal process device. For process variation and linearity guardband, add 0.25V to that and target 2.1V in the plot above. The 25C curve is clearly non-linear there, so perhaps go back to 15mA min for sure. 

  • +1
    TI__Mastermind 47796 points

    Hi Rupesh,

    I think that Michael has explained the headroom plot, which is IC's temperature and load current dependent in this part. For a given max. operating temperature in your application, you need to take into account of the worst case in load conditions. Since the curve responses are not linear, you may consider to be more conservative in taking temperature and load current into considerations.

    Below is a typical Vout headroom data for Vs = 5V at room temperature. 

    If you have additional questions, please let us know. 

    Best,

    Raymond

  • +1
    TI__Guru 60570 points

    First, I presume what you ask about is a sourcing current - current coming out of OPA4376 output. The typical OPA4376 Output Voltage vs Output Current at Tj of 70C would allow around 13mA output current - see below.  But to be safe, over the chip fabrication process variation you should expect no more than 10mA being sourced while maitaining output 0.4V below positive rail (Vout=2.9V on Vs=3.3V).