Features • 2Ω, 1A Peak MosFET Gate Drive • VIN Range: 6V to 42V (LM3409) • VIN Range: 6V to 75V (LM3409HV) • Differential, High-side Current Sense • Cycle-by-Cycle Current Limit • No Control Loop Compensation Required • 10,000:1 PWM Dimming Range • 250:1 Analog Dimming Range • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs • Low Power Shutdown • Thermal Shutdown Protection • Thermally Enhanced eMSOP-10 Package Description The LM3409/09HV are P-channel MosFET (PFET) controllers for step-down (buck) current regulators. They offer wide input voltage range, high-side differential current sense with low adjustable threshold voltage, fast output enable/disable function and a thermally enhanced eMSOP-10 package. These features combine to make the LM3409/09HV ideal for use as constant current sources for driving LEDs where forward currents up to 5A are easily achievable. The LM3409/09HV uses Constant Off-Time (COFT) control to regulate an accurate constant current without the need for external control loop compensation. Analog and PWM dimming are easy to implement and result in a highly linear dimming range with excellent achievable contrast ratios. Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature set. Applications • LED Driver • Constant Current Source • Automotive Lighting • General Illumination • Industrial Lighting

LM3409   6.00 <= V in Lower  V   <= V in Upper  V   <= 42.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM3409HV▲ Extended Input Voltage Range Option Typical Application MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LM3409 LM3409HV PFET Buck Controller for High Power LED Drives	978 Kbytes	12-Jun-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1954: Application Note 1954 LM3409 Demonstration Board	762 Kbytes	20-Nov-09	中文
	AN-1953: Application Note 1953 LM3409HV Evaluation Board	737 Kbytes	20-Nov-09	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool	63 Kbytes	15-Jul-09
	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
Article - #126: Dimming Techniques for Switched-Mode LED Drivers	386 Kbytes	30-Jul-2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3409MY	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM3409MYX	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.