I have a 2.7V 500F super capacitor that I would like to hold the output at 5V to power an Arduino. Here is the DC-DC module that I bought;

I would have expected IN+, IN- to be connected to the capacitor and 5V and GND to go to the Arduino. If that is true, then what is D+ and D- used for?

Thanks.

 

Do you have any specs. from supplier ?

 

From this side of the board, D+ and D- aren't going anywhere. If they are also not connected on the other side, they don't do anything except confuse people.

 

If that is true, then what is D+ and D- used for?

that side is meant for a usb connector.

 

Thanks guys it seems I won't be needing the D+ and D-

 

I would guess this is a step up converter, so if the input it less than 2.7 volts the cap goes from IN+ to IN-

If this is not a step up converter the cap is not suitable for the use you want.

 

seems I won't be needing the D+ and D-

It is unlikely those two pins are actually connected to anything.

 

What's your input voltage? One might assume that it's less than 2.7V, since that is your capacitor rating.

 

I see an input inductor (220 uh), switching transistor (E5OD), and schottky diode (SS14). There must be a controller/regulator of some kind on the back side of the board to drive the switching transistor and regulate the output at 5 volts. D+ and D- might interface to that controller.