I have the NX5P2553 as a power switch connected to a 3.3V supply, being driven by an I/O pin from a processor also running at 3.3V. The ILIM pin is connected to ground through a 18.2K resistor for current limiting. The output has a 22uF cap and is also connected to the load (which draws about 400ma intermittently, and about 30ma all the time).
When I bring the EN pin to 3.3V, the output goes to 3.3V as expected. Drawing current is not a problem. When it bring the EN pin low, (almost 0 V) the output goes to about 2.2V and stays there. Neither situation triggers the /Fault pin.
I thought that the NX5P2553 was be defective and replaced it. The new part does exactly the same thing. There is no way for anything to back-feed the circuit. There is one device connected to the output of this device.
Any ideas what is going on?
