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LM3405 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3405 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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LM3405 550kHz/1.6MHz 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 dissi- pation, an external resistor sets the current as needed for driving various types of LEDs. Switching frequency is inter- nally set to 550kHz (LM3405-Y) or 1.6MHz (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 con- ditions. Additional features include user accessible enable/ dim pin for enabling and PWM dimming of LEDs, thermal shutdown, current limit and over voltage protection. Features n Thin SOT23-6 package n 4.0V to 20V input voltage range n 550kHz (LM3405Y) and 1.6MHz (LM3405X) switching frequencies n 300m Ω NMOS switch n 30nA shutdown current n Enable/DIM input for enabling and PWM dimming of LEDs n Requires only low value, ceramic capacitors n Input voltage UVLO n Internally compensated current mode control n Thermal shutdown Applications n LED Driver n Constant Current Source Typical Application Circuit 20178901 Connection Diagrams 20178905 6-Lead TSOT NS Package Number MK06A 20178960 Pin 1 Indentification ADVANCE INFORMATION October 2006 © 2006 National Semiconductor Corporation DS201789 www.national.com |
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