LM3404   
1.0A Constant Current Buck Regulator for High Power LED Drivers from the PowerWise® Family		 Click link to Download

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

Description

The LM3404/04HV 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 1.5A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an external 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), 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

LM3404
 
6.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 42.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM3401▲Controller
LM3402▲For 500mA Output Current
LM3404HV▲For Vin Range 6V To 75V
LM3405▲Fixed Frequency Buck



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Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM3404 LM3401 LM3402 LM3404HV LM3405
TopologyBuck Buck Hysteretic Controller Constant Current Buck Buck Buck
Input Min Voltage6 Volt 4.5 Volt 6 Volt 6 Volt 3 Volt
Input Max Voltage42 Volt 35 Volt 42 Volt 75 Volt 15 Volt
Output Current1000 mA 525 mA 1000 mA 1000 mA
Efficiency (peak)96 % 92 % 96 % 96 % 92 %
Output Min0.2 Volt 0.2 Volt .2 Volt 0.2 Volt 0.2 Volt
Output Max40 Volt 40 Volt 73 Volt 13.5 Volt
Special FeaturesCurrent Regulation Adjustable Hysteresis, 200 mV Reference Current Regulator
Adjustable OutputYes Yes Yes Yes Yes
On/Off PinYes Yes Yes Yes Yes
Error FlagNo No No No No
Switching Frequency1000 kHz 1500 kHz 1000 kHz 1000 kHz
Adj Switch FrequencyYes No Yes Yes No
Sync PinNo No No No No
Step-DownYes Yes Yes Yes Yes
Step-UpNo No No No
InvertingNo No No No
FlybackNo No No No
RegTypeSwitching Regulator Switching Controller Switching Regulator Switching Regulator Switching Regulator
Temperature Min-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
AutomotiveYes Yes Yes Yes
PowerWiseYes Yes Yes Yes Yes
Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3404MA/NOPB
LM3404MA

RoHS Status



SOIC NARROW		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide6862
DIGIKEYWorldwide4266
FARNELLEurope and Asia119
FUTUREWorldwide1100
NEWARKAmericas234
RS COMPONENTSWorldwide393
TECHMOSAAsia Pacific95
$1.35 each at 1K+ pcsrail
of
95
LM3404MAX/NOPB
LM3404MAX

RoHS Status



SOIC NARROW		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide2500
DIGIKEYWorldwide0
FUTUREWorldwide1100
$1.35 each at 1K+ pcsreel
of
2500
LM3404MR/NOPB
LM3404MR

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide757
DIGIKEYWorldwide1255
FUTUREWorldwide1100
NEWARKAmericas591
$1.35 each at 1K+ pcsrail
of
95
LM3404MRX/NOPB
LM3404MRX

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.35 each at 1K+ pcsreel
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)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3404EVAL
LM3404MA (SOIC) - 1A Constant Current Buck Regulator for HB LEDs (LM3404EVAL Board)Full production


 
DistributorRegionQty
DIGIKEYWorldwide9
FUTUREWorldwide2
NATIONALWorldwide48
$37.50 each1

Features:

  • Integrated 1.0A MOSFET
  • VIN Range 6V to 42V
  • 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

Applications:

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

Contents:

  • A fully assembled LM3404MA based evaluation board
  • LM3404 datasheet
  • AN-1545 - LM3404/HV (SOIC Narrow 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
NATIONALWorldwide0
$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
NATIONALWorldwide105
$37.50 each1

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

Contents:

  • 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 ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LM3404MA/NOPB
LM3404MA
SOIC NARROW81
1		260
235		DetailDownloadN/A
NSZXTT
L3404
MA
LM3404MAX/NOPB
LM3404MAX
SOIC NARROW81
1		260
235		DetailDownloadN/A
NSZXTT
L3404
MA
LM3404MR/NOPB
LM3404MR
PSOP83
3		260
260		DetailDownloadN/A
NSXYTT
L3404
MR
LM3404MRX/NOPB
LM3404MRX
PSOP83
3		260
260		DetailDownloadN/A
NSXYTT
L3404
MR

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
TitleSizeDate
Matching Driver to LED543 Kbytes9-Jan-2008
Article - Methods and Features of LED Drivers  
Article - Contact us for questions on this product  


Reference Design
RD-134 - LM3404 Driving a Seoul Semi Zpower P4 1A LED

CAD Symbols and Models
Download LM3404 CAD Symbols
 Models
N/A

WEBENCH Power Designer My Designs

LM3404
 
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)
LM3404MAABCD150XV1038680025950002736338335
LM3404MAXABCD150XV1038680025950002736338335
LM3404MRABCD150XV1038680025950002736338335
LM3404MRXABCD150XV1038680025950002736338335

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.

LED Driver Design for General Illumination
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Automotive LED Lighting Challenges & Solutions
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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

[Information as of 9-Feb-2010]