Designed to drive high-current LEDs, the 60-V LT3755/LT3755-1 high-side current-sense LED controller can drive up to fourteen 1-A white LEDs from a nominal 12-V input, delivering in excess of 50 W. The parts are used in boost, buck, buck-boost, or SEPIC, and flyback topologies. The LT3755 offers an open LED status pin and the LT3755-1 replaces the status pin with a frequency synchronization pin.
It delivers efficiencies over 94% in boost mode, eliminating any need for external heat sinking. A frequency-adjust pin permits the user to program the frequency between 100 kHz and 1 MHz. Additional features include 3,000:1 True Color PWM dimming, an input voltage range from 4.5 to 40 V, constant-current and constant-voltage regulation, and less than 1-μA shutdown current. (From $2.75 ea/1,000 available now.)
Linear Technology , Milpitas , CA
Literature 800-4-LINEAR
http://www.linear.com
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