• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 50 subscribers
  • Views 497 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

INA826 minimum supply voltage

Bart Klusek
Prodigy 200 points
Other Parts Discussed in Thread: INA826, INA333

Hi everybody,

The datasheet for INA826AID says that the minimum single supply voltage is 3V. According to the revision history, it used to be 2.7V. As a matter of fact, the parametric search at www.ti.com/.../compare still lists 2.7V in the Vsmin column. And so do Digikey and Mouser.

Thanks to all of this, I got confused and used the IC in a battery-powered design, where the extra 300mV is non-insignificant.

So, what exactly is going to happen if I use a 2.8V supply? Which parameters are going to be degraded and how badly?

Also, is there a pin-compatible part that would perform better at lower supply voltages?

Thanks!
Bart

  • 0
    TI__Mastermind 25775 points
    Hello Bart,

    Thank you for considering the INA826 for your design. The minimum supply voltage is 3.0V, so I cannot recommend operating it at a lower supply voltage. You are correct that the specification was updated in April of 2013 and I will have to work with our web folks to update the search tool.

    I'm currently looking into pin-for-pin alternatives and will get back with you as soon as possible.
  • 0 in reply to Pete%20Semig
    Prodigy 10 points

    Hello I have the same question about the supply being 3VDC minimum.  I am using in a thermopile application.

    I did try this on the bench and was able to operate at 2.78VDC:  So I suspect some guard-banding here....  Can you have the designers revisit the spec to see if this can be loosened up a bit?


    If there is another pin for pin substitute I'd be interested also.

     

    Thanks,

    -MJS

  • 0 in reply to Maxim Skender87
    TI__Mastermind 25775 points
    Hello Bart and Maxim,

    While we do have numerous devices that can operate with a 2.7V supply (e.g. INA333), we do not have any with the same pinout as the INA826 that I can recommend.

    Though it sounds like you found a device that operates at a lower voltage than what is specified in the data sheet, please understand that its performance at 2.78V is not assured because the device is tested at 3.0V, not 2.78V. I also have to note that variations in process (fab-to-fab, lot-to-lot, etc.) yield variations in parameters, which is why we perform a final test on all devices. Some of these tests for the INA826 are performed at 3.0V, which is why I cannot recommend operating it at a lower supply voltage.

    The decision for minimum/maximum data sheet values is complicated and involves numerous people and groups in addition to the designer(s) of the ICs. I am confident that these folks would have specified a lower supply voltage if the desired performance was obtained.