Products, Materials & Tools | Jul 15, 2010

Linear Technology LT3496: Triple Output LED Driver Drives Up to Eight 500mA LEDs in Series

Linear Technology announces the H-grade version of the LT3496. The LT3496 is a 2MHz DC/DC converter designed to operate as a three-channel constant current LED driver. Each of the device’s three channels can drive up to eight 500mA LEDs in series, enabling it to drive up to 24 x 500mA LEDs at efficiencies up to 96%.

The H-grade version operates up to a junction temperature of 150?C, compared to the E- and I-grade versions’ 125?C maximum junction temperature. All electrical specifications are identical for the E-, I- and H-grade versions. The H-grade parts are tested and guaranteed to the maximum junction temperature of 150?C. They are ideal for automotive and industrial applications which are subjected to high ambient temperatures.

The LT3496 senses output current at the high side of the LED, enabling buck, buck-boost or boost configurations. Each channel is operated by an independent True Color PWM™ signal, enabling each to be dimmed independently to ratios as high as 3,000:1. A fixed frequency, current-mode architecture ensures stable operation over a wide range of supply and output voltages. A frequency adjust pin enables the user to program the frequency between 330kHz and 2.1MHz to optimize efficiency while minimizing external component size. The LT3496’s thermally enhanced 4mm x 5mm QFN package provides a highly compact solution footprint for 50W LED applications.

Summary of Features: LT3496H:
• Maximum Junction Temperature of 150°C
• True Color PWM™ Dimming Delivers up to 3000:1 Dimming Ratio
• Built-In Gate Driver for PMOS LED Disconnect
• Three Independent Driver Channels with 700mA, 45V Internal Switches
• Operates in Buck, Boost, Buck-Boost Modes
• CTRL Pin Accurately Sets LED Current Sense Threshold Over a Range of 10mV to 100mV
• Low Quiescent Current: 6mA in Active Mode
• <10uA in Shutdown Mode
• Adjustable Switching Frequency: 300kHz to 2.1MHz
• Open LED Protection
• Wide Input Voltage Range: 3V to 40V
• Surface Mount Components
• 28-Lead (4mm x 5mm) QFN Package

The LT3496HUFD is available from stock in a 4mm x 5mm QFN-28 package. Pricing starts at $4.45 each for 1,000 piece quantities. For more information, visit www.linear.com/pr/3496.

Add comment

You can add a comment by filling out the form below. Plain text formatting. Comments are moderated.

Question: What is 1 + 6 ?
Your answer:
FEATURED

Cree Launches Industry’s Highest Efficacy 90 CRI COB LEDs

Cree Launches Industry’s Highest Efficacy 90 CRI COB LEDs Cree, Inc. announces the XLamp® eTone™ LEDs, a breakthrough set of chip-on-board (COB) LEDs that delivers beautiful 90 color rendering index (CRI) light quality at the same efficacy as today’s standard 80 CRI LEDs. Delivering up to 155 lumens per watt (LPW) at 3000 K CCT, 85°C, Cree’s new eTone COB ... Read more »

FEATURED

Luminus Gen 4 COBs: 70W CMH Spots Finally Meet Their Match

Luminus Gen 4 COBs: 70W CMH Spots Finally Meet Their Match Luminus Devices latest, fourth generation chip-on-board LED technology (Gen 4) will open new opportunities in retail lighting and a wide range of indoor and outdoor lighting applications. Luminus Gen 4 COB technology combines significant improvements in efficacy, flux density, high maximum drive ... Read more »

EDITORIAL

High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »

page_peel