ANA608 is the core component of all solar garden lights.
You can make your own solar light or single battery LED booster/driver.
It boosts 0.8-2v to drive White LEDs or other colors with %85-90 efficency
The Booster circuit detects the darkness with detecting the solar panel voltage and enables the LED driver/booster automaticaly.
We are suggesting our 2V 40mA solar panels for this IC
ANA608 Pinout | ANA608 Schematic | ANA608 Datasheet