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.