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OPA313: Absolute Minimum Supply Voltage

Chuchen Wang
Expert 3470 points
Part Number: OPA313
Other Parts Discussed in Thread: OPA322, LMV951, TLV341, TLV341A

Hi,

My customer would like to know the absolute minimum supply voltage for the below parts.  Datasheet shows 1.8V to 5.5V recommended operating range but they are using a LDO that has 1.8V +/-0.4% tolerance output as supply voltage.  Will this be ok?  Else, what other solutions do you recommend?

  • OPA313
  • OPA322

Thanks,

Chuchen

  • 0
    TI__Guru 62700 points
    Chuchen,
    Most LDO's have initial accuracy of few percents and not just a fraction of one percent but if this in fact is the case then you don't need to worry about it. Since 0.4% of 1.8V represents only 7.2mV, OPA313 will work just fine for as long as the supply voltage does not fall below 1.75V.
  • 0
    TI__Guru 62705 points

    Hi Chuchen,

    Realistically a 0.4% deviation below 1.8V (1.7928V) is likely not going to cause any issues.  However, the customer will have to evaluate the performance of the device on their own and make their own design decision that performance meets expectations.  This is because we will not be able to guarantee performance specifications on the device if it's used below the datasheet recommended supply voltage of 1.8V. 

    For a device that is rated below 1.8V consider these devices with their minimum supply listed.  Out of these options we recommend the LMV951.

    LMV951:  0.9V

    TLV341:  1.5V

    TLV341A:  1.5V

  • 0 in reply to Collin Wells
    TI__Expert 3470 points
    Thanks for the quick reply Collin and Marek!