2010

Step-Down DC/DC Converter

Linear Technology (Milpitas, CA) has announced the LT3743, a synchronous step-down DC/DC converter designed to deliver constant current to drive high current LEDs. The device’s 5.5V to 36V input voltage range makes it suitable for applications including industrial, DLP projection, and architectural lighting. It provides up to 20A of continuous LED current from a nominal 12V input, delivering in excess of 80 watts. In pulsed LED applications, it can deliver up to 40A of LED current or 160 watts from a 12V input. Efficiencies as high as 95% eliminate need for external heat sinking and simplify the thermal design. A frequency adjust pin enables the user to program the frequency between 100kHz and 1MHz. Combined with a 4mm x 5mm QFN or thermally enhanced TSSOP-28 package, the LT3743 offers a compact LED driver solution and offers both PWM and CTRL_SELECT dimming, offering 3,000:1 dimming capability at three LED current levels.

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