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OPA197: leakage current in undervoltage condition

Part Number: OPA197

Dear Team,

 

OPA197 is used in a circuit where during failure condition an undervoltage situation can happen. In this case the supply voltage collapses to about two volts. It can be observed that the Iq which is normally in the 1mA range increases to about 5mA in this case. The current is limited with 2.2kOhm resistor. After the failure condition is being resolved the OPA settles again and returns to normal operation.

My question is, in case the failure condition and the leaking 5mA occur for  longer time (say a couple of hours) does this harm the silicon and has influence on the product lifetime. Will the OPA survive this condition?

 

many thanks

Lutz

  • Hello Lutz,

    I checked with the OPA197 Design Engineer and discussed the behavior that you described. He said that when the supply collapses to 2 V the OPA197 the internal amplifier stages are not biased in their normal operating range. Under that condition internal current paths are in different regions of operation and the currents may be less, or more, than what is established under the normal conditions. Therefore, even though the operating current increases to 5 mA under the 2 V supply condition it is not at any level that would damage the device. It should be able to sustain the higher current, lower voltage condition long term without affecting the performance and reliability.

    Do note that TI can't make any assurances about electrical performances, or reliability, when products are operated outside of the specified ranges provided in the product datasheet.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • Hi Lutz,

    We hope your issue is resolved. I am going to close this thread now. Feel free to reply to to re-open if you have any questions moving forward.

    -Tamara