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LM3492 Datasheet

Two-Channel Individual Dimmable LED Driver

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LM3492, LM3492-Q1
SNVS656D – SEPTEMBER 2010 – REVISED OCTOBER 2016
LM3492/-Q1 Two-Channel Individual Dimmable LED Driver With Boost Converter and Fast
Current Regulator
1 Features
Boost Converter:
– LM3492-Q1 is an Automotive Grade Product
That is AEC Q100 Grade 1 Qualified
– Very Wide Input Voltage Ranged
From 4.5 V to 65 V
– Programmable Soft Start
– No Loop Compensation Required
– Stable With Ceramic and Other Low ESR
Capacitors With No Audible Noise
– Nearly Constant Switching Frequency
Programmable From 200 kHz to 1 MHz
Current Regulators:
– Programmable LED Current from 50 mA to
200 mA
– 1000:1 Contrast Ratio at a Dimming
Frequency of More Than 3 kHz, Minimum LED
Current Pulse Width is 300 ns
– Two Individual Dimmable LED Strings up to
65 V, Total 15 W (Typically 28 LEDs at
150 mA)
– Dynamic Headroom Control Maximizes
Efficiency
– Over-Power Protection
– ±3% Current Accuracy
Supervisory Functions:
– Precision Enable
– COMM I/O Pin for Diagnostic and Commands
– Thermal Shutdown Protection
– Thermally Enhanced 20-Pin HTSSOP package
1
2 Applications
• Ultra-High Contrast Ratio 6.5”-10” LCD Display
Backlight up to 28 LEDs
• Automotive or Marine GPS Displays
3 Description
The LM3492/-Q1 integrates a boost converter and a
two-channel current regulator to implement a high
efficient and cost effective LED driver for driving two
individually dimmable LED strings with a maximum
power of 15 W and an output voltage of up to 65 V.
The boost converter employs a proprietary Projected-
On-Time control method to give a fast transient
response with no compensation required, and a
nearly constant switching frequency programmable
from 200 kHz to 1 MHz. The application circuit is
stable with ceramic capacitors and produces no
audible noise on dimming. The programmable peak
current limit and soft-start features reduce current
surges at start-up, and an integrated 190 mΩ, 3.9-A
N-Channel MOSFET switch minimizes the solution
size.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3492
LM3492-Q1
HTSSOP (20)
7.80 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Copyright © 2016, Texas Instruments Incorporated
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.




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LM3492 Datasheet Preview

LM3492 Datasheet

Two-Channel Individual Dimmable LED Driver

No Preview Available !

LM3492, LM3492-Q1
SNVS656D – SEPTEMBER 2010 – REVISED OCTOBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 8
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 12
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 18
8.5 Programming........................................................... 18
9 Application and Implementation ........................ 20
9.1 Application Information............................................ 20
9.2 Typical Application ................................................. 20
10 Power Supply Recommendations ..................... 23
11 Layout................................................................... 23
11.1 Layout Guidelines ................................................. 23
11.2 Layout Example .................................................... 23
12 Device and Documentation Support ................. 24
12.1 Documentation Support ........................................ 24
12.2 Related Links ........................................................ 24
12.3 Receiving Notification of Documentation Updates 24
12.4 Community Resources.......................................... 24
12.5 Trademarks ........................................................... 24
12.6 Electrostatic Discharge Caution ............................ 24
12.7 Glossary ................................................................ 24
13 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (May 2013) to Revision D
Page
• Added 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 value from 32.7 to 36.5 in the Thermal Information table ............................................................................... 5
Changes from Revision B (May 2013) to Revision C
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 20
2 Submit Documentation Feedback
Copyright © 2010–2016, Texas Instruments Incorporated
Product Folder Links: LM3492 LM3492-Q1


Part Number LM3492
Description Two-Channel Individual Dimmable LED Driver
Maker etcTI
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