LINEAR TECHNOLOGY - LT3496 Data Sheet User Guide
Summary
The LT3496 is a powerful triple output DC/DC converter designed for advanced, high-precision LED illumination. This component provides three independent channels offering constant-current source operation and up to 3000:1 dimming via True Color PWM technology. The manual details the device's operational flexibility (including Buck, Boost, and Buck-Boost modes), adjustable frequency, and built-in gate drivers for maximizing efficiency. It is essential for electrical engineers designing complex lighting systems, including RGB displays, automotive lighting, and robust constant-current power sources.
Page 1 Text Content
LT3496
Triple Output LED Driver
FEATURES DESCRIPTION n True Color PWM™ Dimming Delivers Up to 3000:1 The LT®3496 is a triple output DC/DC converter designed Dimming Ratio to operate as a constant-current source and is ideal for n Built-In Gate Driver for PMOS LED Disconnect driving LEDs. The LT3496 works in buck, boost or buck- n Three Independent Driver Channels with 750m A, boost mode. The LT3496 uses a fi xed frequency, current 45V Internal Switches mode architecture resulting in stable operation over a n Operates in Buck, Boost, Buck-Boost Modes wide range of supply and output voltages. A frequency n CTRL Pin Accurately Sets LED Current Sense adjust pin allows the user to program switching frequency Threshold Over a Range of 10m V to 100m V between 330k Hz and 2.1MHz to optimize effi ciency and n Adjustable Frequency: 330k Hz to 2.1MHz external component size. n Open LED Protection
The LT3496 supports 3000:1 dimming control on each
n Wide Input Voltage Range:
channel. Each of the three regulators is independently
Operation from 3V to 30V
operated by that channel’s PWM signal. The PWM feature
Transient Protection to 40V
allows precise adjustment of the color mixing or dimming
n Surface Mount Components
ratio of the LED source. Each of the three channels has
n 28-Lead (4mm × 5mm) QFN and TSSOP Packages
a built-in gate driver to drive an external LED-disconnect P-channel MOSFET, allowing high dimming range. The
APPLICATIONS
output current range of each channel of the LT3496 is
n RGB Lighting
programmed with an external sense resistor.
n Billboards and Large Displays
The CTRL pin is used to adjust the LED current either for
n Automotive and Avionic Lighting
analog dimming or overtemperature protection.
n Constant-Current Sources
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, and others pending.
TYPICAL APPLICATION High Dimming Ratio Triple Output LED Power Supply
PVIN 42V 1μF
CAP1 CAP2 CAP3 200mΩ 200mΩ 200mΩ 3000:1 PWM Dimming at 120Hz
LED1 LED2 LED3
TG1 TG2 TG3
PWM 5V/DIV
7 LEDs 0.5A 0.5A 0.5A
0.47μF 0.47μF 0.47μF 0.5A/DIV
18μH 18μH 18μH 0.5A/DIV
3496 TA01b
0.5μs/DIV
SW1 SW2 SW3 TG1-3 CAP1-3 VC1-3 LED1-3 VREF 22k
VIN LT3496
VIN CTRL1-3
3V TO 24V
PWM1-3 PWM1-3 FADJ 470p F 1μF SHDN SHDN GND OVP1-3
3496 TA01a
3496fd
Page Summary Contents For LINEAR TECHNOLOGY - LT3496 Data Sheet User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 258.46 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What voltage range can the LT3496 operate from?
It supports a wide input voltage range, operating between 3V and 30V.
How can I adjust the LED current or optimize efficiency?
The CTRL pin allows adjustment of the current, while using the sense resistor and adjusting frequency optimizes efficiency.
What dimming capabilities does the LT3496 offer?
It provides True Color PWM™ Dimming that delivers up to a 3000:1 dimming ratio for each channel.
What protection features are included in the driver?
The unit includes Open LED Protection, transient protection up to 40V, and overtemperature protection.