Features • Integrated 2.0A MOSFET • VIN Range 6V to 42V (LM3406) • VIN Range 6V to 75V (LM3406HV) • True average output current control • 1.7A Minimum Output Current Limit Over Temperature • Cycle-by-Cycle Current Limit • PWM Dimming with Dedicated Logic Input • PWM Dimming with Power Input Voltage • Simple Control Loop Compensation • Low Power Shutdown • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs • Thermal Shutdown Protection • eTSSOP-14 Package Description The LM3406/06HV are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 2.0A (typical) for step-down (Buck) regulators. Controlled on-time with true average current and an external current sense resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. LED dimming via pulse width modulation (PWM) is achieved using a dedicated logic pin or by PWM of the power input voltage. The product feature set is rounded out with low-power shutdown and thermal shutdown protection. Applications • LED Driver • Constant Current Source • Automotive Lighting • General Illumination • Industrial Lighting

LM3406   6.00 <= V in Lower  V   <= V in Upper  V   <= 42.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM3401▲ PFET Controller, Scalable Output Current Up To 4A LM3402▲ Output Current Up To 500mA LM3404▲ Output Current Up To 1A LM3406HV▲ Extended Input Voltage Range Up To 75V 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

Datasheets

Title		Size	Date	Other Language
	LM3406/06HV 1.5A Constant Current Buck Regulator for Driving High Power LEDs	551 Kbytes	8-Feb-10

Featured Application Notes

Title		Size	Date	Other Language
	AN-1750: Application Note 1750 LM3406 Evaluation Board	481 Kbytes	9-Sep-08

More Application Notes

Title		Size	Date	Other Language
	AN-1657: Application Note 1657 LM3401 Demo Board	891 Kbytes	29-Jul-08	中文
	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-1853: Application Note 1853 COT Drivers Control LED Ripple Current	158 Kbytes	23-Sep-08
	AN-1763: Application Note 1763 LM3407 Evaluation Board Reference Design	421 Kbytes	21-Jan-09	中文
	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-1953: Application Note 1953 LM3409HV Evaluation Board	737 Kbytes	20-Nov-09	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM3406MH/NOPB RoHS Status	TSSOP EXP PAD	Full production Lead Time: 16 weeks	Distributor Region Qty AVNET-EM Worldwide 225 DIGIKEY Worldwide 0	$1.59 each at 1K+ pcs	rail of 94
LM3406MHX/NOPB RoHS Status	TSSOP EXP PAD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.59 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3406MH/NOPB		TSSOP EXP PAD	14	1	260	Detail	Download	N/A	NSUZXYTT LM3406 MH
LM3406MHX/NOPB		TSSOP EXP PAD	14	1	260	Detail	Download	N/A	NSUZXYTT LM3406 MH

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools

Title	Size	Date
Article - #126: Dimming Techniques for Switched-Mode LED Drivers	386 Kbytes	30-Jul-2009

CAD Symbols and Models Download LM3406 CAD Symbols

Models N/A

LM3406   6.00 <= V in Lower  V   <= V in Upper  V   <= 42.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools?

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3406MH	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM3406MHX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

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.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.