Converter. LM3407 Datasheet

LM3407 Datasheet PDF


Part

LM3407

Description

350-mA Constant Current Output Floating Buck Switching Converter

Manufacture

etcTI

Page 27 Pages
Datasheet
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LM3407 Datasheet
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LM3407
SNVS553C – JANUARY 2008 – REVISED NOVEMBER 2016
LM3407 350-mA, Constant Current Output Floating Buck Switching Converter
for High-Power LEDs
1 Features
1 Input Operating Range 4.5 V to 30 V
• Output Voltage Range: 0.1 VIN to 0.9 VIN
• 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 Undervoltage Lockout (UVLO)
• Thermal Shutdown Protection
• MSOP-8 PowerPAD Package
2 Applications
• LED Drivers
• Constant Current Sources
• Automotive Lighting
• General Illumination
• Industrial Lighting
3 Description
The LM3407 device 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-
channel 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 MSOP-8 package
provides excellent heat dissipation and thermal
performance. Input UVLO and output open-circuit
protection ensure a robust LED driver solution.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3407
MSOP-PowerPAD (8) 3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM3407 Datasheet
LM3407
SNVS553C – JANUARY 2008 – REVISED NOVEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Applications ................................................ 17
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 20
11 Device and Documentation Support ................. 21
11.1 Documentation Support ....................................... 21
11.2 Receiving Notification of Documentation Updates 21
11.3 Community Resources.......................................... 21
11.4 Trademarks ........................................................... 21
11.5 Electrostatic Discharge Caution ............................ 21
11.6 Glossary ................................................................ 21
12 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (May 2013) to Revision C
Page
• Added ESD Ratings table, Thermal Information table, Feature Description section, Device Functional Modes,
Application and Implementation section, Power Supply Recommendations section, Layout section, Device and
Documentation Support section, and Mechanical, Packaging, and Orderable Information section....................................... 1
• Changed RθJA for DGN package from 50°C/W to 55.6°C/W .................................................................................................. 4
Changes from Revision A (January 2009) to Revision B
Page
• Changed layout of National Semiconductor Data Sheet to TI format. ................................................................................ 20
2 Submit Documentation Feedback
Product Folder Links: LM3407
Copyright © 2008–2016, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3407 SNVS553C – JANUARY 2008 – REVISED NOVEMBER 2016 LM3407 3 50-mA, Constant Current Output Floating Buck Switching Converter for High-Powe r LEDs 1 Features •1 Input Operating Range 4.5 V to 30 V • Output Voltage Range: 0.1 VIN to 0.9 VIN • Accurate Constant Current Output • Independen t Device Enable (CMOS Compatible) and P WM Dimming Control • Converter Switch ing Frequency Adjustable From 300 kHz t o 1 MHz • No External Control Loop Co mpensation Required • Supports Cerami c and Low ESR Output Capacitors • Inp ut Undervoltage Lockout (UVLO) • Ther mal Shutdown Protection • MSOP-8 Powe rPAD Package 2 Applications • LED Dri vers • Constant Current Sources • A utomotive Lighting • General Illumina tion • Industrial Lighting 3 Descrip tion The LM3407 device is a constant cu rrent output floating buck switching co nverter designed to provide constant current to high-power LEDs. The device is ideal for automoti.
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