This document discusses several constant current IC chips for power management applications from Analog that can serve as current sources. It lists the LT3085 chip which can provide up to 500mA, the LT3082 chip which can provide up to 200mA, the LT3080-1 chip which can provide up to 1100mA, and the LT3080 chip which can also provide up to 1100mA, along with links to each chip's product page.