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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.