Single chip (IC) with adjustable constant current and PWM?
mosfet - Constant Current LED Driver Output Control using PWM - Electrical Engineering Stack Exchange
Constant Current Operation Based on PWM Drive
Motor Notes : Motor Constant-Current Operation through PWM Driving | Motor Notes : Evolution and Kinds of Motors | TechWeb
3V 3.3V 3.7V 5V 6V Adjustable LED Driver PWM DC-DC Constant Current Converter LT | eBay
Is it OK to PWM a current source? - Electrical Engineering Stack Exchange
Smart Light Power Constant Current Triac Dimmable 0-10V PWM Dimming LED Driver 350mA 500mA 700mA - China LED Power Supply, Power Adaptor | Made-in-China.com