QX5252F QX5252 5252F Solar LED Driver IC
DC to DC Boost Converter

Can power up to 1 Watt LED or up to 1 Watt sting of LED's using a Solar Panel Max 5V - .8 Amp

See Datasheet for details.

Below are some links to examples of it use:

Running 3 volt devices from 1.2 volt batteries

1 watt led solar light QX5252F chip based

See 1N4148 Diode

See Inductors

See LED's

Data Sheet