5 D 4 3 2 ECO CTRL1 C3 1 C4 47uF 1 GND C 15uH D6 D5 D4 SW 5 VIN U2 LT3491ESC8 R2 CTRL2 C7 6 7 GND GND B HIGH EFFICIENCY 4 2 3 JP2 GND 3 LED ON C6 0.47uF 50V R4 10.0 1% VIN 100nF 8 CTRL 2 100K 1% D3 1 1 L2 2 E4 D2 EFFICIENCY OPT CAP CTRL2 D1 2 C5 1uF 6.3V B JP4 SIZE 1 + E2 7 LED 3 2 GND OFF C2 1uF 25V R3 13.3 1% 4 EFFICIENCY JP1 3 ON LED GND 3 3 SIZE 2 3V - 5V GND 8 CTRL 2 E1 1 VIN JP3 6 VIN 100nF VIN APPROVED SMALL SIZE SW 5 VIN U1 LT3491ESC8 CAP C DATE 11/21/05 10uH R1 100K 1% DESCRIPTION PROTO D C1 1uF 6.3V CTRL1 REV 3 L1 E3 1 REVISION HISTORY This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice: Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application, Component substitution and printed circuit board layout may significantly affect circuit performance or reliability. Contact Linear Applications Engineering for assistance. 1 OFF CONTRACT NO. APPROVALS DRAWN MEI DATE 04/11/05 CHECKED A TECHNOLOGY TITLE SCH, LT3491ESC8, LED DRIVER IN SC70 WITH BUILT-IN SCHOTTKY APPROVED ENGINEER DESIGNER Friday, December 16, 2005 5 4 3 SIZE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 CAGE CODE SCALE: DWG NO FILENAME: 2 905A-3.DSN REV DC905A SHEET A 3 1 1 OF 1