5 4 3 2 1 REVISION HISTORY E7 R10 1 TRACK 0 Ohm TRACK 3 R9 OPT C9 2200pF PGOOD E6 2 INTVCC E1 ECO REV - 2 DESCRIPTION APPROVED DATE TOM G. 07-06-12 PRODUCTION 4 R1 SS (SOFT-START) JP5 INTVCC 100K D D C1 D1 CMDSH-3TR OPT INTVCC MODE/SYNC BURST MODE SYNC E8 SYNC (FORCED CONTINUOUS MODE) FCM 1 2 3 4 5 6 2.2uF 16V 0603 U1 9 LTC3626EUDC JP6 17 VIN 4V - 20V E2 + E3 C6 22uF 25V 1210 C14 OPT 1812 * C2 3.3uF 35V 6032 15 16 14 C3 22uF 25V 1210 13 R17 10 5 4 C15 0.33uF 0603 JP7 2 1 INTVCC BOOST MODESYNC SW SW PVIN PVIN SVIN VON 19 20 3 C8 0.1uF 25V 0603 L1 1uH IHLP-2020BZ-ER-1R0M01 RON E4 RUN TMON ITH TSET IOUT IIN 7 RT 12 R3 115K 1% C5 22pF 11 8 RITH CITH 13K 220pF 1 RUN E5 GND C R4 115K 1% R5 57.6K 1% R6 25.5K 1% JP1 1.2V JP2 1.8V JP3 3.3V R7 OPT OPT ITH R8 1 1M EXT 2 TMON 3 INTVCC R2 324K 1% E10 INT R12 1 C11 1uF ON 1 3 OFF INTVCC INTVCC B IOUT 1 INTVCC 3 JP8 ON 2 1MHz 2 JP11 C12 1uF 0603 4.02k FREQ 2 JP4 USER SELECT JP9 TMON (TEMPERATURE MONITOR) VOUT 1.2V/1.8V/3.3V @ 2.5A GND CC 21 2 OFF C10 OPT 1206 E9 3 ON C7 OPT 1206 10 SGND PGND 6 C4 47uF 6.3V 1206 VISHAY 0 Ohm FB GND C 18 TRACKSS PGOOD 3 OFF JP12 2MHz (Int.) E11 E12 E13 TSET IIN (TEMPERATURE SET) R11 IIN 3 2 1 INTVCC TSET EXT SET INTVCC 1M 3 OFF 2 R14 OPT JP10 ON 1 SET/OFF C13 1uF 0603 * A B IOUT C2 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1768A 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. NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN 0402. ALL CAPACITORS ARE IN 0402. R13 4.02k JP13 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. 5 4 3 APPROVALS PCB DES. JW APP ENG. TOM G. TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 2.5A SYNCHRONOUS BUCK REGULATOR WITH MONITORING SIZE N/A SCALE = NONE 2 IC NO. REV. LTC3626EUDC DEMO CIRCUIT 1768A DATE: Wednesday, July 25, 2012 2 SHEET 1 1 OF 1 A