LM3405 PDF Datasheet


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Description

This is 1A Constant Current Buck Regulator. LM3405 500kHz, 1.6MH- 1A Constant Current Buck Regulator for Powering LEDs ADVANCE INFORMATION October 2006 LM3405 550kHz, 1.6MH- 1A Constant Current Buck Regulator for Powering LEDs General Description Integrated with a 1A power switch, the LM3405 is a current mode control switching buck regulator designed to provide a simple, high efficiency solution for driving LEDs. With a 0.2V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. Switching frequency is internally set to 550kH- (LM3405-Y) or 1.6MH- (LM3405-X), allowing small surface mount inductors and capacitors to be used. The LM3405 utilizes current mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. Additional features include user accessible enable, dim pin for enabling and PWM dimming of LEDs, thermal shutdown, curren.