R12 (opt) C1 2.2uF 10V D1 CMDSH-3 E1 CLKOUT E3 VIN CLKIN 4 PHASE 1 RT JP5 R9 150K + C10 * 22uF 25V GND C5 47uF 6.3V 1206 C12 47uF 6.3V 1206 E7 C11 47uF 6.3V opt. 25 PGND R2 10.0K VOUT 2.5V / 3.3V / 5V@5A GND E9 R4 3.16K R5 2.21K R6 1.37K R7 OPT. JP7 2 3 12 SW C7 10pF 11 SW C6 220pF 10 PGND RUN 14K C9 0.1uF 25V 7 E8 C8 100pF SW 13 VOUT 6 ITH TRACK SW 14 EXPOSED PAD 9 5 TRACK PGOOD DCM (DISCONTINUOUS MODE) 8 4 VIN 1 1uH 3 C14 22uF 25V opt. VIN 4V to 14V PVIN 17 L1 4 FB C13 22uF 25V opt. E2 E4 SW 15 FCM (FORCED CONTINUOUS MODE) C3 22uF 16V C4 0.1uF 25V SW 16 2 R3 C2 22uF 16V 3 MODE 1 JP6 OFF PVIN 18 2 PHMODE MODE ON C15 0.1uF 25V SVIN 19 6 5 R1 162K BOOST 20 3 PHASE INTVCC 21 4 SGND 22 2 PHASE 3 CLKOUT 23 U1 LTC3605EUF PHMODE 1 2 CLKIN 24 R11 10 RUN R10 100K 1% R8 100K R13 JP1 JP2 JP3 JP4 0 2.5V 3.3V 5V OPT. PGOOD E5 GND E6 * C10 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1215A 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. 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CONTRACT NO. APPROVALS DRAWN DATE J. Wu 1/30/07 T. Gross 1/31/07 TECHNOLOGY TITLE LTC3605EUF 5A Monolithic Synchronous Buck Regulator ENGINEER CHECKED SIZE CAGE CODE APPROVED Tuesday, December 09, 2008 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 DWG NO REV DC1215A SCALE: FILENAME: SHEET 1 A OF 1