Omron’s LED driver lineup currently consists of 3 items. Part number W2RF002RF is a 7 mm x 7 mm, QFP package that can control up to 24 LEDs. Part number W2RF004RM is a QFN package that can control up to 9 LEDs. Both of these ICs drive LEDs with a constant voltage output. If constant current output is needed, Omron offers part number W2RV005RM. This IC can be used in conjunction with the LED drivers to provide a constant current output.