Other Parts Discussed in Thread: TPS7A88, , TPS7A47
Hello,
I have a design with few analog supply rails that use TPS7A88, TPS7A47, and - unfortunately - TPS7A33. While the first two work great without problems, the negative rail is giving a few mV of output and tens of mV on the Vref pin.
My application is simple datasheet-based with ceramic caps 10 uF on input, 3x10 uF on output, 68 nF Cnr, 10 nF Cff. Resistor sets are 1,2M & 100k and 1M & 160k, PCB layout as in datasheet. Once I got it running after two rounds of resistor and IC matching, third ICs got up and running, but after a few minutes they are gone (maybe I touched them?).
What am I doing wrong? are these ICs really sensitive to some conditions, which I am not aware of?