The LTM®8040 is a fi xed frequency 1A step-down DC/DCμModule™ designed to operate as a constant currentsource. Internal circuitry monitors the output current toprovide accurate current regulation, which is ideal fordriving high current LEDs. High output current accuracyis maintained over a wide current range, from 35mA to1A, allowing a wide dimming range over an output voltagerange of 2.4V to 13V. Unique PWM circuitry allows adimming range of 400:1, avoiding the color shift normallyassociated with LED current dimming.With its wide input range of 4V to 36V, the LTM8040 regulatesa broad array of power sources, from 4-cell batteriesand 5V logic rails to unregulated wall transformers, leadacid batteries and distributed power supplies.The LTM8040 is packaged in a thermally enhanced, compact(15mm × 9mm) and low profi le (2.82mm) moldedLand Grid Array (LGA) package suitable for automatedassembly by standard surface mount equipment. TheLTM8040 is Pb-free and RoHS compliant.