LM3407 - 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Application Notes Knowledge Base

Features
Input operating range 4.5V to 30V
Output voltage range: 0.1VIN to 0.9VIN
Accurate constant current output
Independent device enable (CMOS compatible) and PWM dimming control
Converter switching frequency adjustable from 300 kHz to 1 MHz
No external control loop compensation required
Supports ceramic and low ESR output capacitors
Input Under Voltage Lock Out (UVLO)
Thermal shutdown protection
eMSOP-8 Package

General Description


The LM3407 is a constant current output floating buck switching converter designed to provide constant current 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 Buck
Input Min Voltage 4.5 Volt
Input Max Voltage 30 Volt
Output Range 0.45V to 27V
Output Current 350 mA
Efficiency (peak) 96 %
Output Min 0.45 Volt
Output Max 27 Volt
Special Features PWM Dimming Input, Independent Device Enable, Adjustable Switching Frequency
Adjustable Output Yes
On/Off Pin Yes
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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LM3407

 
4.50 <=
V in Lower
 V
 
<=
V in Upper
 V
 
<= 30.00
Ambient Temperature  °C <= 100


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Also Recommended
LM34020.5A Output Current, 42V Maximum Input Voltage
Additional Resources
Design Tools

Application Notes


Block Diagram


click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM3407 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs 377
Kbytes
21-Jan-09 Download

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


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
LM3407EVAL350mA, Constant Current Output Floating Buck Switching Regulator Evaluation BoardFull productionN/A
 
Buy Now
1+$37.501-
8 weeksN/A
LM3407MYMINI SOIC EXP PAD8NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$0.85reel
of
1000
ZXTT
STZB
6 weeksN/A
LM3407MYXMINI SOIC EXP PAD8NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$0.85reel
of
3500
ZXTT
STZB
6 weeksN/A

General Description


The LM3407 is a constant current output floating buck switching converter designed to provide constant current to high power LEDs. The device is ideal for automotive, industrial and general lighting applications. The LM3407 has an integrated power N-MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low power shutdown. An exposed pad eMSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3407MYABCD15003417500423400011201409060
LM3407MYXABCD15003417500423400011201409060

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    
LM3407 Component Calculator 139 Kbytes 4-Feb-2008 View    

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Application Notes


TitleSize in Kbytes Date Click link below to 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  

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More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators 421
Kbytes
3-Oct-02 Download
AN-1657: Application Note 1657 LM3401 Demo Board 891
Kbytes
29-Jul-08 Download
AN-1657 (Chinese): Application Note 1657 LM3401 Demo Board
351 Kbytes  
AN-1192: Application Note 1192 Overture™ Series High Power Solutions 548
Kbytes
15-Jun-04 Download
AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool 63
Kbytes
15-Jul-09 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-1545: Application Note 1545 LM3404/LM3404HV Evaluation Board 665
Kbytes
14-Aug-09 Download
AN-1545 (Chinese): Application Note 1545 LM3404/LM3404HV Evaluation Board
493 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  
AN-127: Application Note 127 LM143 Monolithic High Voltage Operational Amplifier Applications 441
Kbytes
2-May-04 Download
AN-298: Application Note 298 Isolation Techniques for Signal Conditioning 379
Kbytes
2-Oct-02 Download
AN-182: Application Note 182 Improving Power Supply Reliability with IC Power Regulators 27
Kbytes
3-Oct-02 Download
AN-1853: Application Note 1853 COT Drivers Control LED Ripple Current 158
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23-Sep-08 Download
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-1590: Application Note 1590 LM3405 Demo Board 475
Kbytes
19-Mar-07 Download
AN-1644: Application Note 1644 Powering and Dimming High-Brightness LEDs with the LM3405 Constant-Current Buck Regulator 174
Kbytes
17-Jan-08 Download
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 8-Nov-2009]