USB-CAP  (Olimex)  USB-CAP LOW ESR FILTER FOR CURRENT HUNGRY DEVICES

MOD-USB3G and other similar devices have high current consumption peaks during initialization (up to 2A) and some USB hosts have hard time providing such surge currents. We designed USB-CAP (contains 2 x 1000uF capacitors) with low ESR to remove these power supply glitches.

https://www.olimex.com/Products/USB-Modules/USB-CAP/