LM3405A

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3405A SNVS508D – OCTOBER 2007 – REVISED SEPTEMBER 2016 LM3405A 1.6-MHz, 1-A Constant Current Buck LED Driver With Internal Compensation in Tiny SOT and MSOP-PowerPAD™ Packages 1 Features 1 VIN Operating Range of 3 V to 22 V Drives up to 5 High-Brightness LEDs in Series at 1A Thin SOT-6 and MSOP-PowerPAD™-8 Packages 1.6-MHz Switching Frequency EN/DIM Input for Enabling and PWM Dimming of LEDs 300-mΩ NMOS Switch 40-nA Shutdown Current at VIN = 5 V Internally Compensated Current-mode Control Cycle-by-Cycle Current Limit Input Voltage UVLO Overcurrent Protection Thermal Shutdown 2 Applications LED Drivers Constant Current Sources Industrial Lighting LED Flashlights LED Lightbulbs Typical Application Circuit D3 D2 3 Description The LM3405A is a 1-A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205-V 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 1.6 MHz, allowing small surface mount inductors and capacitors to be used. The LM3405A uses current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. With a maximum input voltage of 22 V, the device ...