TPS3839: Negative-going input threshold accuracy

Shota Mago,

The threshold accuracy means % error from the typical value. This is calculated directly from the negative-going threshold voltage.

For example, let's look at TPS3808.

For TPS3808G33 (the 3.3V device variant), the typical negative going threshold is 3.07V.

Under typical conditions, TPS3808 has +/- 1% threshold accuracy which means the negative-threshold voltage can be 3.07V +/- 0.0307V = 3.0393V to 3.1007 V. This is for room temp under typical conditions.

Under worst case conditions such as device tolerance, across temperature, across full operating input voltage range, TPS3808 has +/-2% accuracy meaning the negative-threshold voltage can vary between 3.07V +/- 0.0614V = 3.0086V to 3.1314V

So when devices are "1% accuracy" that usually means only for typical conditions. You can calculate the accuracy at worst-case by:

minimum accuracy = (1 - (VIT-_min / VIT-) ) *100
maximum accuracy = (1 - (VIT- / VIT-_max) ) *100

Since the accuracy is directly related to the threshold voltage.

I hope this answers your question. Please let me know if you have any more questions. Thanks!

-Michael