5 4 3 2 1 REVISION # REVISION HISTORY SD PC AD FD PGOOD E6 D 0 0 0 0 2 2 2 DESCRIPTION DATE APPROVED 1st Release 2 05/26/09 T. Gross INTVcc E1 R1 D INTVcc 100K C1 E7 R9 1 TRACK 0 Ohm JP5 TRACK 3 R10 (Opt) 2.2uF 16V U1 LTC3601EUD 2 13 SS (SOFT-START) 1 15 16 INTVcc C6 22uF 16V 1210 (Opt) MODE/SYNC 1 2 3 4 (FORCED CONTINUOUS MODE) FCM 5 6 SYNC 7 6 C8 0.1uF 25V PGOOD INTVCC BOOST C9 2200pF BURST MODE SYNC 2 4 C E8 D1 CMDSH-3TR (Opt) C3 22uF 16V 1210 14 TRACK SW SW MODE/SYNC VON VIN VIN FB ITH RUN RT PGND 10 17 3 4 8 12 SGND 9 + E4 C4 47uF 6.3V 1210 VISHAY R3 115K 1% C5 10pF 11 RITH CITH 13K 220pF C7 (Opt) 1210 C10 (Opt) 1210 VOUT 1.2V/1.8V/3.3V @ 1.5A C E5 GND E9 GND CC R4 115K 1% R5 57.6K 1% R6 25.5K 1% JP1 1.2V JP2 1.8V JP3 3.3V R7 (Opt) 22pF (Opt) R11 324K 1% E2 RON 0 Ohm JP6 VIN 4V - 15V L1 2.2uH IHLP-2020BZ-ER-2R2M01 JP4 USER SELECT * C2 3.3uF 35V E3 GND B B RUN ON 1 2 2 3 OFF INTVcc JP7 A ITH FREQ 1 R8 1M * 1 1MHz EXT 2 3 JP8 2MHz (Int.) INTVcc 3 INT JP9 APPROVALS C2 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1353A 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. 5 4 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 customers 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. 3 DRAWN: Rudy Bautista ENGINEER: Tom Gross LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD MILPITAS, CA. 95035 (408)432-1900 (408)434-0507 (FAX) Title LTC Confidential For Customer Use Only LTC3601EUD 1.5A Monolithic Synchronous Buck Regulator APPROVED: SD CHECKED: Date: A www.linear.com Friday, July 24, 2009 2 Document Number Rev Demo Circuit 1353A C:\ORCADWIN\CAPTURE\1353A\1353A_REV2.DSN 1 Sheet 1 2 of 1