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LM4140: LM4140ACM-1.0/NOPB part power input requirement

Part Number: LM4140

Hi Ti Team,

We have used LM4140ACM-1.0/NOPB part in our design to generate 1V reference voltage. We have given 5V supply as input voltage and controlling the enable signal using 2V5 level GPIO.

with 5V input supply and 2V5 enable signal, LDO output voltage is not generating. Please let us know why output voltage is not generating in this configuration.?