LED Driver operates up to junction temperature of 125°C.

Press Release Summary:



Housed in 4 x 5 mm QFN package, 2 MHz DC/DC Converter Model LT3496 operates as 3-channel constant current LED driver. Each channel can drive up to eight 500 mA LEDs in series, enabling device to drive up to 24 x 500 mA LEDs at efficiencies up to 96%. Unit senses output current at high side of LED, allowing buck, buck-boost, or boost configurations. Operated by independent True Color PWM(TM) signal, each channel can be dimmed independently to ratios as high as 3,000:1.



Original Press Release:



Triple Output LED Driver Drives up to 24 x 500mA LEDs & Offers a 150°C Maximum Junction Temperature



MILPITAS, CA - July 13, 2010 - 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(TM) 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.

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 http://www.linear.com/pr/3496.

Summary of Features: LT3496H

o Maximum Junction Temperature of 150°C

o True Color PWM(TM) Dimming Delivers up to 3000:1 Dimming Ratio

o Built-In Gate Driver for PMOS LED Disconnect

o Three Independent Driver Channels with 700mA, 45V Internal Switches

o Operates in Buck, Boost, Buck-Boost Modes

o CTRL Pin Accurately Sets LED Current Sense Threshold Over a Range of 10mV to 100mV

o Low Quiescent Current: 6mA in Active Mode

o <10uA in Shutdown Mode

o Adjustable Switching Frequency: 300kHz to 2.1MHz

o Open LED Protection

o Wide Input Voltage Range: 3V to 40V

o Surface Mount Components

o 28-Lead (4mm x 5mm) QFN Package

About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule® products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, µModule and are registered trademarks and True Color PWM is a Trademark of Linear Technology Corp. All trademarks are the property of their respective owners.

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