5 4 3 2 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 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 Applications Engineering for assistance. ECO REV DESCRIPTION 1 DATE PROD APPROVED 07/25/08 D D U1 LTC3561AEDD L1 VOUT VFB ITH 8 + Cout2 0.1uF 1 Cc 1000pF Rfb5 OPT C1 OPT USER SELECT JP2 Rfb3 287K, 1% 1.8V 7 OFF ON Rfb4 200K, 1% Rfb2 499K, 1% 2 JP1 Rc 16.2K 1.2V 1.5V E4 GND 1 2 Rset 549K, 1% 3 Rfb1 249K, 1% 1.8V/1.5V/1.2V Cout3 1.0A OPT C 6 SD/RT 5 1 Rs1 1M 8 E2 Cffw 10pF 6.3V 2 0 Cbyp OPT GND SVIN 7 4 6 3 Rfilt PGND Cin1 10uF 6.3V 2.2uH D1 Cout1 22uF OPT 4 Cin2 1uF OPT E3 3 SW 1 PVIN 2 C Cin3 22uF 16V + 5 SGND 2.5V-5.5V VIN * E1 VIN E5 GND B B CONTRACT NO. APPROVALS A DRAWN * CIN3 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1072B TO DAMPEN THE (POSSIBLE) MI CHECKED APPROVED RINGING VOLTAGE DUE TO LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB ENGINEER WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED. DESIGNER DATE 03/01/06 TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A SCH, LTC3561AEDD, 1A SYNCHRONOUS MONOLITHIC BUCK REGULATOR SIZE CAGE CODE DWG NO REV DC1072B Friday, July 25, 2008 5 4 3 SCALE: FILENAME: 2 107BA-1.DSN 1 SHEET 1 1 OF 1