5 4 3 2 1 PGood E7 2 4.7M GND E5 Rfb3 412K, 1% Rfb2 698K, 1% Cout3 0.1uF JP3 JP2 Opt. 3.3V C 2 Rfb4 280K, 1% 1.8V 2.5V 1 1 3 7 Rsd 8 Rset 549K E2 Rfb1 887K, 1% 1% Rfb5 Opt. Sync/Mode Cffw 10pF Opt. 4 2 Rs2 1M R1 10K Cout2 1uF OFF ON E4 L1 RPG RFB1 RSW CFFW GND GND C1 COUT2 RC CC U1 COUT1 CIN2 CIN1 E6 B Vout 1.8V / 2.5V / 3.3V E3 1.25A Cout4 Opt. Cc 1000pF Burst Mode C Rsw Opt. C1 Opt. 6.3V 6 1 Rc 16.2K 2.2uH D1 Cout1 22uF Opt. 3 Sy/Mode 10 SD/RT 2 9 Ith PGND Cbyp Opt. 1 Vfb SVin 4 2 PGood 7 11 JP1 8 100K 0 Rs1 1M Pulse-Skip 3 SW 1 Rfilt PVin SGND Cin1 10uF 6.3V Cin2 1uF Opt. 6 5 Cin3 Opt. L1 Rpg GND VIN E1 Cin4 47uF 16V 3 Vin 2.5V-5.5V D U1 LTC3411AEDD 5 D B RSET PCB SILKSCREEN 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 SIGNIFICANTLYAFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 CONTRACT NO. APPROVALS DRAWN DATE June Wu 9/15/06 Tom Gross 9/15/06 CHECKED TECHNOLOGY TITLE LTC3411AEDD 1.25A Monolithic Synchronous Buck Regulator APPROVED ENGINEER SIZE DESIGNER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 CAGE CODE DWG NO REV A DC1176A Monday, July 14, 2008 SCALE: 2 FILENAME: SHEET 1 A 1 OF 1