5 4 3 2 1 PGood E7 10 E5 Rfb3 475K, 1% Rfb2 332K, 1% JP3 JP2 1.2V Opt. 1.8V 1.5V 1 1 OFF ON E4 E6 GND GND B C1 Rc Cc Cout1 U1 C 2 Rfb4 825K, 1% Cout2 Cin2 B Cout3 0.1uF 2 Rfb1 412K, 1% L1 Cin1 GND 3 7 4.7M 2 Rsd Cffw 47pF 1% Rfb5 Opt. Rset 324K E2 Cout2 47uF 6.3V Vout 1.2V/1.5V/1.8V E3 1.8A Cout4 Opt. Cc 1000pF Rs2 1M R1 10K Sync/Mode Rsw Opt. C1 Opt. Cout1 47uF 6.3V D1 Opt. 4 Burst Mode Rc 13.0K SD/RT Sy/Mode 1 9 Ith 3 C Vfb 6 1 2 PGood SVin 8 JP1 Cbyp Opt. 7 PGND Rs1 1M 8 4 1 0 100K SW SGND Rfilt 2 Pulse-skip 3 Cin1 22uF 6.3V L1 1.7uH PVin 5 Cin2 22uF 6.3V opt. 6 GND Cin3 Opt. Rpg 3 VIN E1 Cin4 47uF 16V 11 Vin 2.5V-5.5V D U1 LTC3568EDD 5 D Rpg Rfb1 Rsw Cffw 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 SIGNIFICANTLY AFFECT 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 J. Wu 1/10/07 T. Gross 1/10/07 CHECKED TECHNOLOGY TITLE LTC3568EDD 1.8A Monolithic Synchronous Buck Regulator APPROVED ENGINEER DESIGNER Monday, June 18, 2007 2 SIZE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 CAGE CODE SCALE: FILENAME: DWG NO A REV DC1206A SHEET 1 A 1 OF 1