LM3404 - 1.0A Constant Current Buck Regulator for High Power LED Drivers

	LM3404 - 1.0A Constant Current Buck Regulator for High Power LED Drivers from the PowerWise® Family

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Design Tools	Reference Designs	Application Notes	Knowledge Base

Features

•	Integrated 1.0A MOSFET
•	V_IN Range 6V to 42V (LM3404)
•	V_IN 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

General Description

The LM3404/04HV 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

Parametric Table expand

Parametric Table collapse

Topology Buck

Input Min Voltage 6 Volt

Input Max Voltage 42 Volt

Output Current 1000 mA

Efficiency (peak) 96 %

Topology Buck

Input Min Voltage 6 Volt

Input Max Voltage 42 Volt

Output Current 1000 mA

Efficiency (peak) 96 %

Output Min 0.2 Volt

Output Max 40 Volt

Special Features Current Regulation

Adjustable Output Yes

On/Off Pin Yes

Error Flag No

Switching Frequency 1000000 Hz

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 Selection Guide Yes

PowerWise Yes

View Using Catalog

Typical Performance

click for larger image

WEBENCH Live Simulation!

LM3404 LED WEBENCH® Custom Design/Analyze/Build It/Test It
6.00 <=	V in Lower V	<=	V in Upper V	<= 42.00
Select LED Manufacturer: and Part #

LED Properties: Vf: If: Rd:
#Series		#Parallel
V _LED	V	I _LED	A	<= 1.0
Ambient Temperature			°C	<= 100
Try full version of LED WEBENCH®

Also Recommended

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

Additional Resources

Online Seminars

An Introduction to High Brightness LED Applications and Driving Techniques

Design Tools (see below)

Application Notes (see below)

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM3404/04HV 1.0A Constant Current Buck Regulator for Driving High Power LEDs	551 Kbytes	6-Jun-07	View Online	Download	Receive via Email

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM3404EVAL

LM3404 Evaluation Board

Full production

N/A

$37.50

8 weeks

N/A

LM3404MREVAL

1.0A Constant Current Buck Regulator for Driving High Power LEDs

Full production

N/A

$37.50

N/A

LM3404MA

SOIC NARROW

STD

NOPB

235

260

RoHS

Download

Full production

N/A

1K+

$1.35

rail
of
95

NSZXTT
L3404
MA

6 weeks

500

LM3404MAX

SOIC NARROW

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.35

reel
of
2500

NSZXTT
L3404
MA

6 weeks

10000

LM3404MR

PSOP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.45

rail
of
95

NSXYTT
L3404
MR

6 weeks

N/A

LM3404MRX

PSOP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.45

reel
of
2500

NSXYTT
L3404
MR

6 weeks

N/A

General 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.

Design Tools

Title	Size in Kbytes	Date
Matching Driver to LED	543 Kbytes	9-Jan-2008	View Online	Download	Receive via Email
Methods and Features of LED Drivers			View
Contact us for questions on this product			View

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

Reference Designs

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

Application Notes

Title	Size in Kbytes	Date
AN-1545: Application Note 1545 LM3404/LM3404HV Evaluation Board	661 Kbytes	7-Jan-08	View Online	Download	Receive via Email
AN-1500: Application Note 1500 LM3402/02HV Demo Board	29977 Kbytes	5-Jun-07	View Online	Download	Receive via Email
AN-1500 (Chinese): Application Note 1500 LM3402/02HV Demo Board	531 Kbytes
AN-1585: Application Note 1585 LM3402 and LM3404 High Power PSOP-8 Evaluation Board	493 Kbytes	4-Oct-07	View Online	Download	Receive via Email
AN-1629: Application Note 1629 Thermal Performance of the LM3404/04HV in SO-8 and PSOP-8 Packages	410 Kbytes	31-May-07	View Online	Download	Receive via Email
AN-1629 (Chinese): Application Note 1629 Thermal Performance of the LM3404/04HV in SO-8 and PSOP-8 Packages	380 Kbytes
AN-1657: Application Note 1657 LM3401 Demo Board	891 Kbytes	13-Mar-08	View Online	Download	Receive via Email
AN-1657 (Chinese): Application Note 1657 LM3401 Demo Board	351 Kbytes
AN-1644: Application Note 1644 Powering and Dimming High-Brightness LEDs with the LM3405 Constant-Current Buck Regulator	174 Kbytes	17-Jan-08	View Online	Download	Receive via Email
AN-1763: Application Note 1763 LM3407 Evaluation Board Reference Design	399 Kbytes	18-Jan-08	View Online	Download	Receive via Email
AN-1685: Application Note 1685 LM3405A Demo Board	907 Kbytes	19-Oct-07	View Online	Download	Receive via Email
AN-1590: Application Note 1590 LM3405 Demo Board	475 Kbytes	19-Mar-07	View Online	Download	Receive via Email

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

[Information as of 24-Jul-2008]