These IC are used in the solar lantern kits I have in the store. The IC includes a NiMH solar charger, and a boost converter/PWM driver for the LEDs. It's a pretty amazing feature set in such a small, cheap package. I wanted to make the ICs more widely available so you can use them in your own projects. I've unfortunately never seen them on eBay and have only been able to get them direct from Shenzhen. This kit includes 10 ICs and inductors. To complete the circuit you'd need to add an NiMH battery, LEDs and solar panel. I have a write up on this chip on on my blog which includes a complete datasheet.