LM3492, LM3492Q

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SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013

Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current

Regulator

Check for Samples: LM3492, LM3492Q

1

FEATURES

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•

Boost Converter:

–

COMM I/O pin for diagnostic and

commands

–

LM3492Q is an Automotive Grade Product

that is AEC Q100 Grade 1 Qualified

–

Thermal shutdown protection

–

Very Wide Input Voltage Ranged from 4.5V-

–

Thermally enhanced 20-Pin HTSSOP

65V

package

–

Programmable Soft-start

APPLICATIONS

–

No Loop Compensation Required

•

Ultra-high contrast ratio 6.5”-10” LCD display

–

Stable with Ceramic and Other low ESR

backlight up to 28 LEDs

Capacitors with no Audible Noise

•

Automotive or marine GPS display

–

Nearly Constant Switching Frequency

Programmable from 200 kHz to 1 MHz

DESCRIPTION

•

Current Regulators:

The LM3492 integrates a boost converter and a two-

–

Programmable LED Current from 50 mA to

channel current regulator to implement a high efficient

200 mA

and

cost

effective

LED

driver

for

driving

two

–

1000:1 Contrast Ratio at a Dimming

individually dimmable LED strings with a maximum

power of 15W and an output voltage of up to 65V.

Frequency of more than 3 kHz, Minimum

The boost converter employs a proprietary Projected-

LED Current Pulse width is 300 ns

On-Time control method to give a fast transient

–

Two Individual Dimmable LED strings up to

response with no compensation required, and a

65V, total 15W (typically 28 LEDs at 150

nearly constant switching frequency programmable

mA)

from 200 kHz to 1 MHz. The application circuit is

–

Dynamic Headroom Control maximizes

stable with ceramic capacitors and produces no

audible noise on dimming. The programmable peak

efficiency

current limit and soft-start features reduce current

–

Over-Power protection

surges at startup, and an integrated 190 m

Ω, 3.9A N-

–

±3% current accuracy

Channel MOSFET switch minimizes the solution size.

•

Supervisory Functions:

–

Precision enable

TYPICAL APPLICATION

1

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2

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Products conform to specifications per the terms of the Texas

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