Features • Hysteretic Control for Speed and Simplicity • Input Operating Range of 4.5V-35V • 1.5MHz maximum switching frequency • Low 200mV reference voltage • Programmable current limit • High speed CMOS compatible enable/dimming • Adjustable hysteresis • Input UVLO • No output capacitor required • MSOP-8 package Description The LM3401 is a switching controller designed to provide constant current to high power LEDs. The LM3401 drives an external P-MOSFET switch for step-down (Buck) regulators. The LM3401 delivers constant current within ±6% accuracy to a wide variety and number of series connected LEDs. Output current is adjusted with an external current sensing resistor to drive high power LEDs in excess of 1A. For improved accuracy and efficiency, the LM3401 features dual-side hysteresis, very low reference voltage, and short propagation delay. A cycle by cycle current limit provides protection against over current and short circuit failures. Additional features include adjustable hysteresis and a CMOS compatible input pin for PWM dimming. Applications • LED Driver • Battery Charger

LM3401   4.50 <= V in Lower  V   <= V in Upper  V   <= 35.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM3409▲ Input Voltage To 42V LM3409HV▲ Input Voltage 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

Datasheet

Title		Size	Date	Other Language
	LM3401 Hysteretic PFET Controller for High Power LED Drive	390 Kbytes	13-Mar-08

Featured Application Notes

Title		Size	Date	Other Language
	AN-1657: Application Note 1657 LM3401 Demo Board	891 Kbytes	29-Jul-08	中文

More Application Notes

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	AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators	421 Kbytes	3-Oct-02
	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-1763: Application Note 1763 LM3407 Evaluation Board Reference Design	421 Kbytes	21-Jan-09	中文
	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
LM3401 Component Calculator	171 Kbytes	28-Apr-2008
LED Reference Design Library
Article - Driving high-power LEDs in series-parallel arrays

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3401MM	ABCD150	0	34175	0	0	4234000	1	1201409060
LM3401MMX	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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