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ADI Power by Linear LT3492

Triple Output LED Driver with 3000:1 PWM Dimming

Overview

TopologyBuck Converter
Input voltage5 V
Switching frequency330-2100 kHz
Output 10.3 A
IC revisionA

Description

The LT®3492 is a triple output DC/DC converter designed to operate as a constant-current source and is ideal for driving LEDs. The LT3492 works in buck, boost or buckboost mode. The LT3492 uses a fixed frequency, currentmode architecture resulting in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 330kHz and 2.1MHz to optimize efficiency andexternal component size.The external PWM input provides 3000:1 LED dimming on each channel. Each of the three channels has a built-in gate driver to drive an external LED-disconnect P-channel MOSFET, allowing high dimming range. The output current range of each channel of the LT3492 is programmed with an external sense resistor.The CTRL pin is used to adjust the LED current either for analog dimming or overtemperature protection.

Features

  • True Color PWM™ Dimming Delivers Up to 3000:1Dimming Ratio
  • Built-In Gate Driver for PMOS LED Disconnect
  • Three Independent Driver Channels with 600mA, 60V Internal Switches
  • Operates in Buck, Boost, Buck-Boost Modes
  • CTRL Pin Accurately Sets LED Current Sense Threshold Over a Range of 10mV to 100mV
  • Adjustable Frequency: 330kHz to 2.1MHz
  • Open LED Protection
  • Wide Input Voltage Range:Operation from 3V to 30VTransient Protection to 40V
  • Surface Mount Components
  • 28-Lead (4mm × 5mm) QFN and TSSOP Packages

Typical applications

  • Automotive
  • RGB Lighting
  • Avionic Lighting
  • Large Displays
  • Billboards
  • Constant-Current Sources

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
7447789133
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 33 1.22 1.15 153 240 16 7332 Robust
Order Code Data­sheet
7447789133
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples