DC-DC USB Boost Module 0.9-5V to 5V 600mA - 10 Pack
$9.95
SKU 60664113
If you need USB power from a varying power supply of between 0.9 and 5V, these modules from PMD Way solve the problem.
Simply feed in 0.9V up to 5V to the solder pads on the left-hand side of the board and you have a USB 5V 600mA output at the USB socket. Done!
Sold in packs of ten. Free delivery, worldwide.