B C E7 R6 0 R5 Opt. R7 0 TGEN 10 CTRL 5 VREF C3 0.01uF 2 GND E10 C4 0.01uF 14 15 Q1 Si2319DS 2 3 LED+ R8 392k OUT PVIN R13 5.1k R9 Opt. R3 Opt. LED+ R15 Opt. 12 LED+ 330mA E2 ISN ISP 2 SW 1 SW PVIN OUT FB 4 Opt. 3 2 13 8 R10 Opt. PWM SYNC CTRL R11 Opt. 16 OUT +C1 E1 Q2 Opt. 1 R12 10k 7 9 E8 TG U1 LT3518EUF RT PWM SHDN 6 3 4 E6 VC SHDN OUT 11 E5 R2 Opt. 1206 C6 2.2uF Opt. R1 0.300 1% 1206 CVIN 1uF 50V GND GND R4 51k VIN 17 VIN E3 3V-30V 40V Transients R16 1206 Opt. 1 COUT 2.2uF 50V 3 Opt. 2 OUT 10uH CPVIN 2.2uF 50V VIN 4 +C2 SS E4 D1 10MQ060N L1 CIN Boost PVIN 3V-40V E 3 PVIN D 1 A R14 16.5k 1% 1MHz E12 GND 2 C5 4.7nF E9 E11 SYNC GND LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Customer Notice 1 A B 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 Technology Applications Engineering For Assistance. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. C LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 PHONE (408) 432-1900 FAX (408) 434-0507 Title 1 Full-Featured LED Driver with 2.3A Switch Current Size A Date: Document Number Demo Circuit 1160A Wednesday, July 18, 2007 D Rev LT3518EUF Sheet 1 E of 1