step-up CC: PT4110 AX2012 NCP5006 XL6001 XL6005 http://www.ebay.com/itm/131191713826 http://www.ebay.com/itm/321461904029 "boost led driver" "white led driver" step-down CC: PT4115 QX9920 http://www.ebay.com/itm/201248789667 "buck led driver" -- Jakab Péter