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LM3492 Datasheet Preview

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

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

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.

etcTI

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

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LM3492 Datasheet

Two-Channel Individual Dimmable LED Driver

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Two-Channel Individual Dimmable LED Driver

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