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LM3492MHX/NOPB
Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator
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LM3492, LM3492-Q1SNVS656D –SEPTEMBER 2010–REVISED OCTOBER 2016
LM3492/-Q1 Two-Channel Individual Dimmable LED Driver With Boost Converter and Fast
Current Regulator Features Boost Converter: LM3492-Q1is an Automotive Grade Product
Thatis AEC Q100 Grade1 Qualified Very Wide Input Voltage Ranged
From 4.5Vto65V 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 kHzto1 MHz
Current Regulators: Programmable LED Current from50 mAto
200 mA 1000:1 Contrast Ratioata Dimming
Frequencyof More Than3 kHz, Minimum LED
Current Pulse Widthis 300ns Two Individual Dimmable LED StringsuptoV, Total15W (Typically28 LEDsat
150 mA) Dynamic Headroom Control Maximizes
Efficiency Over-Power Protection ±3% Current Accuracy
Supervisory Functions: Precision Enable COMM I/O Pinfor Diagnostic and Commands Thermal Shutdown Protection Thermally Enhanced 20-Pin HTSSOP package
Applications Ultra-High Contrast Ratio 6.5”-10” LCD Display
Backlightupto 28 LEDs Automotiveor Marine GPS Displays
DescriptionThe LM3492/-Q1 integratesa boost converter anda
two-channel current regulatorto implementa high
efficient and cost effective LED driver for driving two
individually dimmable LED strings witha maximum
powerof 15W and an output voltageof upto 65V.
The boost converter employsa proprietary Projected-
On-Time control method to givea fast transient
response with no compensation required, anda
nearly constant switching frequency programmable
from 200 kHzto1 MHz. The application circuitis
stable with ceramic capacitors and produces no
audible noise on dimming. The programmable peak
current limit and soft-start features reduce current
surgesat start-up, and an integrated 190 mΩ, 3.9-A
N-Channel MOSFET switch minimizes the solution
size.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application
