The LM3405A LED driver is a current mode control buck switching regulator designed to provide a simple, high efficiency solution for driving high power LEDs (Typical Vf = 3.8V).  An external resistor sets the current as needed for driving various types of LEDs with a 0.205V reference voltage feedback control to minimize power dissipation. The LM3405A uses internal compensation offering ease-of-use and predictable, high performance regulation over a wide range of operating conditions. Additional features include a user accessible EN/DIM pin for enabling and Pulse Width Modulation (PWM) dimming of LEDs, thermal shutdown, cycle-by-cycle current limiting, and over-current protection.