LM3402 - 0.5A Constant Current Buck Regulator for High Power LED Drivers from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Reference Designs Application Notes Knowledge Base

Features
•Integrated 0.5A N-channel MOSFET
•VIN Range from 6V to 42V (LM3402)
•VIN Range from 6V to 75V (LM3402HV)
•500 mA Output Current Over Temperature
•Cycle-by-Cycle Current Limit
•No Control Loop Compensation Required
•Separate PWM Dimming and Low Power Shutdown
•Supports all-ceramic output capacitors and capacitor-less outputs
•Thermal shutdown protection
•MSOP-8, PSOP-8 Packages

General Description

The LM3402/02HV are monolithic switching regulators designed to deliver constant currents to high power LEDs. More...


Applications

•LED Driver
•Constant Current Source
•Automotive Lighting
•General Illumination
•Industrial Lighting
  Typical Application
click for larger image


ParametersValues
Topology Constant Current Buck
Input Min Voltage 6 Volt
Input Max Voltage 42 Volt
Output Current 525 mA
Efficiency (peak) 96 %
Output Min .2 Volt
Output Max 40 Volt
Adjustable Output Yes
On/Off Pin Yes
Error Flag No
Switching Frequency 1000 kHz
Adj Switch Frequency Yes
Sync Pin No
Step-Down Yes
Step-Up No
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 125 deg C
Automotive Yes
PowerWise Yes


Typical Performance

click for larger image


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LM3402
 
6.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 42.00
Ambient Temperature  °C <= 100


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Also Recommended
LM3401▲Vin 4.5V To 35V, External PFET For Up To 4.0A Output Current
LM3402HV▲For Vin Range 6V To 75V
LM3404▲For 1.0A Output Current
LM3405A▲Vin 3.0V To 22V, Up To 1.0A Output Current, Fixed 1.6 MHz Switching Frequency
LM3407▲Vin 4.5V To 30V, Adjustable Switching Frequency, EMSOP-8 Package
Additional Resources
Design Tools

Application Notes


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM3402/LM3402HV 0.5A Constant Current Buck Regulator for Driving High Power LEDs 564
Kbytes		 14-Dec-08 Download
LM3402/LM3402HV 0.5A Constant Current Buck Regulator for Driving High Power LEDs (Japanese)
 600 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM3404FSTDIMEVLM3404FSTDIMEV - Fast Dimming and True Constant LED Current Evaluation BoardFull productionN/A
 
Buy Now 		1+$40.001-
8 weeksN/A
LM3404MREVALLM3402/LM3404 High Power PSOP-8 Evaluation boardFull productionN/A
 
Buy Now 		1+$37.501-
8 weeksN/A
LM3402EVALLM3402MA (Mini SOIC) - 0.5A Constant Current Buck Regulator for HB LEDs (LM3402EVAL Board)Full productionN/A
 
Buy Now 		1+$37.501-
8 weeksN/A
LM3402MRPSOP8NOPB3260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10rail
of
95		NSXYTT
L3402
MR
6 weeksN/A
LM3402MRXPSOP8NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
2500		NSXYTT
L3402
MR
12 weeksN/A
LM3402MMMINI SOIC8NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		ZXTT
SNEB
6 weeks20000
LM3402MMXMINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
3500		ZXTT
SNEB
6 weeks7500

General Description

The LM3402/02HV 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 735 mA (typical) for step-down (Buck) regulators. Hysteretic control with controlled on-time coupled with an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series - parallel connected arrays of LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low-power shutdown and thermal shutdown complete the feature set.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3402MMABCD150XV1038680025950002736338335
LM3402MMXABCD150XV1038680025950002736338335
LM3402MRABCD150XV1038680025950002736338335
LM3402MRXABCD150XV1038680025950002736338335

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.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
LED Reference Design Library     View    
Article - Driving High-Power LEDS     View    

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Reference Designs
•LM3402 Reference Design - 1 InGaN UV LED, 420 mA
•LM3402 Reference Design - 3 InGaN White LEDs, 350 mA
•LM3402 Reference Design - Parallel GaP or GaN LEDs, 200 mA
•LM3402 Reference Design - 1-2 InGaN LEDs, 335 mA
•LM3402 Reference Design - 1 InGaN or AlInGaP LED, 160 mA
•LM3402 Reference Design - 2 InGaN or 3 AlInGaP LEDs, 470 - 500 mA
•LM3402 Reference Design - 6 InGaN White LEDs, 350 mA
•LM3402 Reference Design - 4 InGaN White LEDs, 330 mA
•LM3402 Reference Design - 6 InGaN White LEDs, 330 mA
•LM3402 Reference Design - 1 InGaN UV LED, 350 mA
•LM3402 Reference Design - 4 InGaN White LEDs, 350 mA
•LM3402 Reference Design - 1 InGaN LED, 350 mA
•LM3402 Reference Design - 2 AlInGaP Red/Amber LEDs, 350 mA
•LM3402 Reference Design - 2 InGaN LEDs, 350 mA
•LM3402 Reference Design - 3 AlInGaP Red/Amber LEDs, 350 mA
•LM3402 Reference Design - 3 InGaN LEDs, 350 mA

Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1853: Application Note 1853 COT Drivers Control LED Ripple Current 158
Kbytes		 23-Sep-08 Download
AN-1839: Application Note 1839 LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board 678
Kbytes		 10-Dec-08 Download
AN-1839 (Chinese): Application Note 1839 LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board
 746 Kbytes  
AN-1585: Application Note 1585 LM3402 and LM3404 High Power PSOP-8 Evaluation Board 493
Kbytes		 4-Oct-07 Download
AN-1500: Application Note 1500 LM3402/02HV Demo Board 29977
Kbytes		 5-Jun-07 Download
AN-1500 (Chinese): Application Note 1500 LM3402/02HV Demo Board
 531 Kbytes  

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool 63
Kbytes		 15-Jul-09 Download
AN-127: Application Note 127 LM143 Monolithic High Voltage Operational Amplifier Applications 441
Kbytes		 2-May-04 Download
AN-1763: Application Note 1763 LM3407 Evaluation Board Reference Design 421
Kbytes		 21-Jan-09 Download
AN-1763 (Chinese): Application Note 1763 LM3407 Evaluation Board Reference Design
 531 Kbytes  
AN-1750: Application Note 1750 LM3406 Evaluation Board 481
Kbytes		 9-Sep-08 Download
AN-1954: Application Note 1954 LM3409 Demonstration Board 607
Kbytes		 11-Jun-09 Download
AN-1954 (Chinese): Application Note 1954 LM3409 Demonstration Board
 502 Kbytes  
AN-181: Application Note 181 3-Terminal Regulator Is Adjustable 165
Kbytes		 1-May-04 Download
AN-1529: Application Note 1529 LM3430 Evaluation Board 2770
Kbytes		 21-Aug-07 Download
AN-1529 (Chinese): Application Note 1529 LM3430 Evaluation Board
 789 Kbytes  
AN-1148: Application Note 1148 Linear Regulators: Theory Of Operation and Compensation 200
Kbytes		 10-May-04 Download
AN-1148 (Japanese): Application Note 1148 Linear Regulators: Theory Of Operation and Compensation
 216 Kbytes   Download
AN-1148 (Chinese): Application Note 1148 Linear Regulators: Theory Of Operation and Compensation
 396 Kbytes  

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 4-Nov-2009]