LM3402   
0.5A Constant Current Buck Regulator for High Power LED Drivers from the PowerWise® Family		 Click link to Download

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

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.

Applications
•LED Driver
•Constant Current Source
•Automotive Lighting
•General Illumination
•Industrial Lighting
WEBENCH Power Designer My Designs

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


What are WEBENCH® tools?

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



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Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM3402 LM3401 LM3402HV LM3404 LM3405A LM3407
TopologyConstant Current Buck Buck Hysteretic Controller Constant Current Buck Buck Buck Buck
Input Min Voltage6 Volt 4.5 Volt 6 Volt 6 Volt 3 Volt 4.5 Volt
Input Max Voltage42 Volt 35 Volt 75 Volt 42 Volt 22 Volt 30 Volt
Output Current525 mA 525 mA 1000 mA 1000 mA 350 mA
Efficiency (peak)96 % 92 % 96 % 96 % 92 % 96 %
Output Min.2 Volt 0.2 Volt .2 Volt 0.2 Volt 0.2 Volt 0.45 Volt
Output Max40 Volt 73 Volt 40 Volt 20 Volt 27 Volt
Adjustable OutputYes Yes Yes Yes Yes Yes
On/Off PinYes Yes Yes Yes Yes Yes
Error FlagNo No No No No
Switching Frequency1000 kHz 1500 kHz 1000 kHz 1000 kHz 1600 kHz 1000 kHz
Adj Switch FrequencyYes No Yes Yes No Yes
Sync PinNo No No No No No
Step-DownYes Yes Yes Yes Yes Yes
Step-UpNo No No No No No
InvertingNo No No No No No
FlybackNo No No No No No
RegTypeSwitching Regulator Switching Controller Switching Regulator Switching Regulator Switching Regulator Switching Regulator
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
AutomotiveYes Yes Yes Yes Yes Yes
PowerWiseYes Yes Yes Yes Yes Yes
Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3402MR/NOPB

RoHS



PSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide4145
AVNET-EMWorldwide380
DIGIKEYWorldwide762
FUTUREWorldwide985
NEWARKAmericas165
$1.10 each at 1K+ pcsrail
of
95
LM3402MRX/NOPB

RoHS



PSOP		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
2500
LM3402MM/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AITGAsia Pacific1001
DIGIKEYWorldwide7802
FARNELLEurope and Asia488
FUTUREWorldwide1100
KEIKONGAsia Pacific3000
NEWARKAmericas979
RSL MICROAsia Pacific36000
$1.10 each at 1K+ pcsreel
of
1000
LM3402MMX/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3500

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3402EVAL
LM3402MA (Mini SOIC) - 0.5A Constant Current Buck Regulator for HB LEDs (LM3402EVAL Board)Full production
Lead Free (RoHS)

 
DistributorRegionQty
DIGIKEYWorldwide10
FUTUREWorldwide3
NATIONALWorldwide29
$37.50 each1
LM3402MA 0.5A Constant Current Buck Regulator for Driving High Power LEDs

General Features:
  • Integrated 0.5A N-Channel MOSFET
  • Vin Range from 6V to 42V (LM3402)
  • 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
  • Thermanl shutdown protection
  • MSOP-package
Applications:
  • LED Driver
  • Constant Current Source
  • Automotive Lighting
  • General Illumination
  • Industrial Lighting
LM3402EVAL Package Includes:
  • A fully assembled LM3402MA based evaluation board
  • LM3402 datasheet
  • AN-1500 - LM3402/HV (Mini SOIC package) evaluation board appnote

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3404FSTDIMEV
LM3404FSTDIMEV - Fast Dimming and True Constant LED Current Evaluation BoardFull production
Lead Free (RoHS)

 
DistributorRegionQty
FUTUREWorldwide1
NATIONALWorldwide2
$40.00 each1

Description:

The LM3404/04HV are buck regulator derived controlled current sources designed to drive a series string of high power, high brightness LEDs (HBLEDs) at forward currents of up to 1.0A (LM3404/04HV). This evaluation board demonstrates the enhanced thermal performance, fast dimming and true constant LED current capabilities of the LM3402 and LM3404 devices.

Contents:


Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3404MREVAL
LM3402/LM3404 High Power PSOP-8 Evaluation boardFull production


 
DistributorRegionQty
DIGIKEYWorldwide4
FUTUREWorldwide7
NATIONALWorldwide110
$37.50 each1
General Features:

  • Integrated 1.0A MOSFET
  • VIN Range 6V to 42V (LM3404)
  • VIN Range 6V to 75V (LM3404HV)
  • 1.2A 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
  • SO-8 Package, PSOP-8 Package

Applications:

  • LED Driver
  • Constant Current Source
  • Automotive Lighting
  • General Illumination
  • Industrial Lighting

LM3404MREVAL Package Includes:

  • A fully assembled LM3404HVMR PSOP based evaluation board
  • LM3404HV datasheet
  • AN-1585 - LM3404/HV (PSOP package) evaluation board appnote

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM3402MR/NOPB
PSOP83260RoHSDownloadN/A
NSXYTT
L3402
MR
LM3402MRX/NOPB
PSOP83260RoHSDownloadN/A
NSXYTT
L3402
MR
LM3402MM/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
SNEB
LM3402MMX/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
SNEB

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.


LED Driver Design for General Illumination
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Automotive LED Lighting Challenges & Solutions
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WEBENCH LED Designer -- LED Driver Design in Minutes
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LED Driver Design for General Illumination
Date: 5/4/2009
Length: 0:36:55

Automotive LED Lighting Challenges & Solutions
Date: 4/14/2009
Length: 0:35:00

WEBENCH LED Designer -- LED Driver Design in Minutes
Date: 2/3/2009
Length: 0:5:02
[Information as of 20-Nov-2009]