Linear Technology Corp. announced the LT3744, a synchronous step-down dc-dc converter designed to deliver constant current to drive high current LEDs. Its 3.3V to 36V input voltage range makes it suited for a wide variety of applications, including industrial, DLP projection and architectural lighting. The LT3744 uses two external switching MOSFETs, delivering up to 20A (80W) of continuous LED current from a nominal 12V input. In pulsed LED applications, it can deliver up to 40A of LED current or 160 watts from a 12V input. Delivering efficiencies as high as 95%, it can eliminate the need for external heat sinking.
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The LT3744’s peak current mode controller maintains ±3% LED current regulation over a wide voltage range from VEE to VIN. By allowing VEE to float to negative voltages, several LEDs can be driven from a single Li-Ion battery with a simple, single step-down output stage. Additionally, this enables a unique inverting step-down topology which allows a single common anode heat sink to be used for RGB LEDs. A frequency adjust pin allows the user to program the frequency between 100kHz and 1MHz, optimizing efficiency while minimizing external component size. Combined with its 5mm x 6mm QFN package, the LT3744 offers a very compact 80W LED driver solution.
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The LT3744 is available in 36-pin 5mm x 6mm QFN package. Two temperature grades are available, with operation from -40 to 125 degrees C (junction) for the extended and industrial grades. The 1,000 piece price starts at $4.55 each. All versions are available from stock.
source: http://www.powerpulse.net/story.php?storyID=31889
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