5 3 2 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 customers 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. ECO R1 OPT R2 80.6k 1% SHDN GND R3 0 R5 10k E3 R4 OPT C2 APPROVED 16 5 RT BIAS 7 11 REF OUT 2 13 VADJ PWM 14 12 VC LED 3 9 0.22uF 15 8 L1 10uH 1 SW SHDN C3 D1 C4 CDRH6D28NP100NC 2.2uF 6.3V DFLS140 E4 PWM LED+ E5 2 0.1uF DNC 6 10 SW1 LED ON DATE 04/13/05 2 C1 2.2uF 50V BOOST VIN GND 4 E2 C 1 LT3474EFE VIN 4V - 36V DESCRIPTION PROTO D DNC E1 REV 3 U1 VIN 1 REVISION HISTORY GND D 4 C PWM GND LED1 LXHL-LW3C LUXEON III STAR + 1 - 2 4 Q2 1 3 2 1 B B OPT 3 Q1 OPT SO8 8 7 6 5 LED- SOT23 CONTRACT NO. APPROVALS DRAWN MEI CHECKED A DATE 09/23/04 TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCH, LT3474EFE, 36V STEP-DOWN 1A LED DRIVER A APPROVED ENGINEER DESIGNER Tuesday, May 10, 2005 5 4 3 SIZE CAGE CODE SCALE: DWG NO FILENAME: 2 841A-3.DSN REV DC842A SHEET 3 1 1 OF 1