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LP38693: Ven vs Vin

Yee Yong Teo
Expert 4335 points
Part Number: LP38693

Hi,

What would be the min Ven for Vin = 3.6V? Is there a formula?

Thanks.

- YY

  • 0
    TI__Genius 13085 points

    Hi Yee Yong,

    The enable threshold for Vin=3.6V will be very similar to the enable threshold for Vin=4V. See the graph below which shows Ven vs Vin, note that it will also have a temp drift very similarly to the Vin=4V which is shown in the datasheet. 

    -Kyle

  • 0 in reply to Kyle Van Renterghem
    TI__Expert 4335 points
    Hi Kyle,

    This doesn't tally with Ven list shown in the table of section 7.6 in the datasheet. But somehow it is close to the Ven vs Temp graph in the datasheet. So, this would be the correct Ven threshold to be followed, right?

    Thanks.

    -YY
  • 0 in reply to Yee Yong Teo
    TI__Expert 4335 points
    Hi Kyle,

    Any update to my questions above? By the way, are we able to confirm that 1.5V Ven works for 3.6V Vin across whole temperature range?

    Thanks.

    - YY
  • 0 in reply to Yee Yong Teo
    TI__Genius 13085 points
    Hi YY,

    EC table specs will always have wider min/max limits than the typical performance that most parts will see. This is because the EC table must cover temperature variation, process variation, and final test repeatability.

    The majority of devices should have an enable threshold which drifts across temperature similarly to Figure 18 that you are referencing. However, there may be some units which perform differently but pass the final production test. To ensure that all devices turn on it would be best to use the limit set in the EC table since the graph I provided my original post shows that the enable threshold for 3.6V is only about 50mV lower than the enable threshold for 4V.