Hi,
I am characterizing the LDO TPS7A91 using a thermal chamber.
Setting a temperature range between 20 and 140 degree Celsius, I am seeing that the output voltage accuracy, respect to the output voltage value at 25 degrees, is about 3% when the temperature reaches 80 degrees.
To define Vout , I am using 0.1% tolerance resistances with 25ppm of temperature coefficient. For this reason, I was expecting to see output accuracy < 1.7% in all the temperature range.
Could you have any explanation why is this happening? Do you have performed any test that guarantees the accuracy of the component in all its temperature range?
My conditions are the following:
Input voltage=5.5V
Output voltage (nominal)=3.4V
Output Load=22 ohm
Regards
Michele