Linear Technology’s (Milpitas, CA) LT3952 is a current mode step-up DC/DC converter with an internal 60V, 4A DMOS power switch. It is specifically designed to drive high power LEDs in multiple configurations. It combines input and output current regulation loops with output voltage regulation to operate as a flexible current/voltage source. Input voltage range is 3V to 42V. The LT3952 can drive up to sixteen 350mA white LEDs from a nominal 12V input, delivering in excess of 15 watts. It incorporates a high side current sense, enabling its use in boost mode, buck mode, buck-boost mode or SEPIC topologies. The LT3952 delivers efficiencies of over 94% in the boost topology, eliminating the need for external heat sinking.