LTM8040 Datasheet | Linear Technology

Electrical Specifications Subject to Change LTM8040 36V, 1A µModule LED Driver .. n n n n n n n n Features True Color PWM™ Delivers Constant Color with 400:1 Dimming Ratio Wide Input Range: 4V to 36V Up to 1A LED Current Adjustable Control of LED Current High Output Current Accuracy is Maintained Over a Wide Range from 35m A to 1A Open LED and Short-Circuit Protection Grounded Cathode Connection Small Footprint, Low Profile (15mm × 9mm × 2.82mm) Surface Mount LGA Package DESCRIPTION The LTM®8040 is a fixed frequency 1A step-down DC/DC μModule™ designed to operate as a constant current source. Internal circuitry monitors the output current to provide accurate current regulation, which is ideal for driving high current LEDs. High output current accuracy is maintained over a wide current range, from 35m A to 1A, allowing a wide dimming range over an output voltage range of 2.4V to 13V. Unique PWM circuitry allows a dimming range of 400:1, avoiding the color shift normally associated with LED current dimming. With its wide input range of 4V to 36V, the LTM8040 regulates a broad array of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LTM8040 is packaged in a thermally enhanced, pact (15mm × 9mm) and low profile (2.82mm) molded Land Grid Array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8040 is Pb-free and Ro HS pliant. APPLICATIONS n n n n Automotive and Avionic Lighting Architectural Detail Lighting Display Backlighting Constant Current Sources , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. μModule is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 1A LED Driver μModule 100 VIN- 4V TO 36V 1μF VIN SHDN LEDA LPWR EFFICIENCY (%) TWO WHITE LEDs 6V TO 9V 1A LTM8040 ADJ PWM RT 215k 650k Hz GND...