5 D 4 3 2 VLED- 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 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 REV 2 DESCRIPTION DATE PROTO APPROVED 03/16/04 D E5 E4 VLED+ D1 VIN E1 1 3.3V-4.2V R3 2 0.10 LXHL-BW02 LUMILEDS C1 1uF 6.3V 2 SD25 GND 9 1 PMEG2010EA C 7 SW 1 Vin OFF / ON E2 U1 R6 LT1618EDD OPT 8 2 C 4.7uF D2 L1 10uF SW1 C2 SHDN SW 6 Isp 3 Isn 2 Fb 1 R5 1M R2 866k E3 R4 250mA/500mA 2.2M R1 124k 10 SW2 B 5 BRIGHTNESS Iadj Vc 4 B GND IADJ C3 0.1uF *500mA PULSE ONLY CONTRACT NO. APPROVALS DRAWN MEI CHECKED A APPROVED ENGINEER DESIGNER Tuesday, June 22, 2004 5 4 3 DATE 02/18/04 TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCH, LT1618EDD, CONSTANT-CURRENT 1.4MHz WHITE LED DRIVER SIZE CAGE CODE SCALE: DWG NO FILENAME: 780A-2.DSN 2 REV DC780A SHEET A 2 1 1 OF 1