A * B C D E CIN1 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1343A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED. 4 4 U1 LTC3564EDCB E1 2.5V - 5.5V + CIN1 22uF GND * CIN 22uF 6.3V 1206 VIN SW 1 6 RUN Vfb 4 7 GND L1 1.7uH CDRH2D18/HP-1R7NC Sumida SGND 3 PGND VIN COUT 22uF 6.3V 1206 COUT1 0.1uF USER SELECT 3 5 2 E2 RFB1 402K 1% (Opt) VOUT 1.2V 1 JP2 3 1.5V RSD 1.0M JP1 GND GND 3 RFB2 402K 1% 2 OFF E5 VOUT 1.25A(max) CFFW 22pF ON E4 RFB6 JP5 E3 JP3 2 1.8V RFB3 200K 1% RFB4 200K 1% 2 JP4 RFB5 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. 1 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B 0 CONTRACT NO. APPROVALS DRAWN AntoninaK DATE 9/28/07 CHECKED TECHNOLOGY TITLE APPROVED ENGINEER Tom Gross 9/28/07 DESIGNER Sunday, December 07, 2008 C SIZE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC3564EDCB Synchronous Monolithic Buck Regulator CAGE CODE SCALE: DWG NO FILENAME: D 1 REV DC1343A SHEET 1 E 3 OF 1