SBOA367B December   2019  – June 2022 TLV9001 , TLV9002 , TLV9004 , TLV9051 , TLV9052 , TLV9054 , TLV9061 , TLV9062 , TLV9064

 

  1.   Designing for TLV90xxS operational amplifiers with shutdown
  2.   Trademarks
  3. 1 Introduction
  4. 2 Shutdown Specifications
  5. 3  SHDN Pin Limits and Connections
  6. 4 Output Behavior During Enable and Shutdown
  7. 5 Enable Time and Shutdown Time Factors
    1. 5.1 Quiescent Current
    2. 5.2 Temperature
    3. 5.3 Load
    4. 5.4 Feedback Path
  8. 6 Impact on Commonly Used Circuit Configurations
    1. 6.1 Inverting Amplifier Circuit
    2.     14
    3. 6.2 Non-Inverting Amplifier Circuit
    4.     16
    5. 6.3 Buffer Circuit
    6.     18
  9. 7 Advanced Circuit Functionality Using Amplifiers With Shutdown
  10. 8 Conclusion
  11. 9 References
  12. 10Revision History

5.2 Temperature

An amplifier’s enable and disable times and behaviors also depend on other factors. For example, differing temperatures can provide small yet noticeable shifts in these times. In general, higher temperatures mean both faster enable times and faster shutdown times due to lower voltage threshold levels of the device’s transistors. The threshold voltage is inversely proportional to the temperature. Note that this relationship is not exact due to higher order effects.

The table below illustrates this effect by showing and disable times of a TLV9002S device at key temperatures. This data was taken with channel 1 of the device in a unity gain buffer configuration with a 2.5-V input, a 10-kΩ load, and a SHDN pin that was toggled between 0 and 2 V. Channel 2 of the device was left always enabled in a unity gain configuration with a 2.5-V input and no external load. Notice that there is about a 15% difference in enable and shutdown times from –40°C to 125°C.

Table 5-2 TLV9002S Enable and Shutdown Times Across Temperature
—–40°C0°C25°C85°C125°C
Enable Time40.8 µs39.4 µs38.6 µs36.8 µs35.4 µs
Shutdown Time3.38 µs3.22 µs3.22 µs3.04 µs2.88 µs