Issue:

On startup (before uC has turned on) there is an oscillation in current limiting to the 5v switched rail, due to the fact that at that point the POWER_SW enable line is floating

Potential Solution:

Add a pulldown (~10k) to this line in order to ensure operational state during power up and power down events

Testing:

No pulldown (input power supply @ 3.3v)

• Blue: V_in
• Yellow: I_in

With pulldown (input power supply @ 3.3v), note lack of ringing after initial inrush, before device is controlled by uC (~+16ms)

• Blue: V_in
• Yellow: I_in