Using the Beaglebone black Revision A6A. I powering it with supplying 5V to 
the Vdd pins.  The 5V is coming from an adjustable regulator with an enable 
line. Also I have a 10uF tantalum capacitor on the regulator's output to 
avoid sending a noisy 5V.

When that enable line goes high, the beaglebone black does not power on all 
the time.  Sometimes the BBB boots properly. However, instead of powering 
on sometimes, it seems that the power management chip on the BBB is 
switching Vdd to no load. I still have a similar result with different 
tantalum cap values.  

What is the state of the switch in the power management chip on a rising 
edge of Vdd?  Has anyone else had a problem powering the BBB with Vdd?

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