Low 5V supply

NETMF & Gadgeteer
1

Hi!

I’m working on a project with the Panda II and noticed that I’m only getting about 4.65V on the 5V pin.

I’m having a LiPo battery at 8V on VIN and everything draws only about 300mA.

The regulator shouldn’t output that much less than 5V, should it? What could the reason be?

2

There’s a protection diode on the Panda II. What you’re seeing is the drop from that diode. You can short the diode (make sure you know what you’re doing, and how this will affect your design and the protection the diode offers), or power from an external 5V source.