Features • Input operating range 4.5V to 30V • Output voltage range: 0.1VIN to 0.9VIN • Accurate constant current output • Independent device enable (CMOS compatible) and PWM dimming control • Converter switching frequency adjustable from 300 kHz to 1 MHz • No external control loop compensation required • Supports ceramic and low ESR output capacitors • Input Under Voltage Lock Out (UVLO) • Thermal shutdown protection • eMSOP-8 Package Description The LM3407 is a constant current output floating buck switching converter designed to provide constant current to high power LEDs. The device is ideal for automotive, industrial and general lighting applications. The LM3407 has an integrated power N-MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low power shutdown. An exposed pad eMSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution. Applications • LED Driver • Constant Current Source • Automotive Lighting • General Illumination • Industrial Lighting

LM3407   4.50 <= V in Lower  V   <= V in Upper  V   <= 30.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM3402▲ 0.5A Output Current, 42V Maximum Input Voltage MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM3407 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs	377 Kbytes	21-Jan-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1763: Application Note 1763 LM3407 Evaluation Board Reference Design	421 Kbytes	21-Jan-09	中文

More Application Notes

Title		Size	Date	Other Language
	AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators	421 Kbytes	3-Oct-02
	AN-1657: Application Note 1657 LM3401 Demo Board	891 Kbytes	29-Jul-08	中文
	AN-1192: Application Note 1192 Overture™ Series High Power Solutions	548 Kbytes	15-Jun-04
	AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool	63 Kbytes	15-Jul-09
	AN-1839: Application Note 1839 LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board	678 Kbytes	10-Dec-08	中文
	AN-1545: Application Note 1545 LM3404/LM3404HV Evaluation Board	665 Kbytes	14-Aug-09	中文
	AN-1585: Application Note 1585 LM3402 and LM3404 High Power PSOP-8 Evaluation Board	493 Kbytes	4-Oct-07
	AN-1500: Application Note 1500 LM3402/02HV Demo Board	29977 Kbytes	5-Jun-07	中文
	AN-127: Application Note 127 LM143 Monolithic High Voltage Operational Amplifier Applications	441 Kbytes	2-May-04
	AN-298: Application Note 298 Isolation Techniques for Signal Conditioning	379 Kbytes	2-Oct-02
	AN-182: Application Note 182 Improving Power Supply Reliability with IC Power Regulators	27 Kbytes	3-Oct-02
	AN-1853: Application Note 1853 COT Drivers Control LED Ripple Current	158 Kbytes	23-Sep-08
	AN-1750: Application Note 1750 LM3406 Evaluation Board	481 Kbytes	9-Sep-08
	AN-1954: Application Note 1954 LM3409 Demonstration Board	762 Kbytes	20-Nov-09	中文
	AN-1590: Application Note 1590 LM3405 Demo Board	475 Kbytes	19-Mar-07
	AN-1644: Application Note 1644 Powering and Dimming High-Brightness LEDs with the LM3405 Constant-Current Buck Regulator	174 Kbytes	17-Jan-08
	AN-181: Application Note 181 3-Terminal Regulator Is Adjustable	165 Kbytes	1-May-04
	AN-1529: Application Note 1529 LM3430 Evaluation Board	2770 Kbytes	21-Aug-07	中文
	AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation	200 Kbytes	10-May-04	日本語 中文

Design Tools

Title	Size	Date
LM3407 Component Calculator	139 Kbytes	4-Feb-2008

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3407MY	ABCD150	0	34175	0	0	4234000	1	1201409060
LM3407MYX	ABCD150	0	34175	0	0	4234000	1	1201409060

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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