TPS54140 working with 6-32V input regulating down to 4V, but fails to regulate from 4.5-6V Help!
Datasheet implies the part should enter a low drop out mode when VIN drops below 2.1V of PH, but what we see happening is that the VOUT tracks VIN-2.1V instead of going into low drop out mode below 6V down to 4.5V.
The datasheet indicates a load above 50mA is required to maintain 100mV drop out voltage, so we have increased our load to accomodate, but we do not see the part going into the low drop out mode.
Thanks for any feedback on how to get into low drop out mode.
