5 4 3 2 1 REVISION HISTORY PGOOD E6 D ECO REV 1 1 DESCRIPTION PRODUCTION APPROVED DATE TOM GROSS 08-14-09 INTVCC E1 R1 D INTVcc 100K C1 E7 R9 1 TRACK 0 Ohm JP5 TRACK 3 R10 (Opt) 2.2uF 16V U1 LTC3601EMSE 16 2 4 11 SS (SOFT-START) 15 C 13 14 INTVcc 3 4 (FORCE CONTINUOUS MODE) FCM 5 6 SYNC C6 22uF 16V 1210 (Opt) MODE/SYNC 1 2 BURST MODE SYNC E8 6 PGOOD C9 2200pF D1 CMDSH-3TR (Opt) C3 22uF 16V 1210 12 C8 0.1uF 25V 5 INTVCC BOOST SW SW 1 2 VON 7 TRACK MODE/SYNC VIN VIN FB RUN ITH 4 10 17 RITH CITH C10 (Opt) 1210 VOUT 1.2V / 1.8V / 3.3V @ 1.5A C E5 GND 13.0K 1% 220pF 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% + C7 (Opt) 1210 9 RT PGND PGND SGND 3 C4 47uF 6.3V 1210 R3 115K 1% C5 10pF RON 0 Ohm 8 E2 E4 VISHAY 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 ITH FREQ 1 INTVcc JP7 R8 1M 1 1MHz EXT 2 3 JP8 2MHz (Int.) INTVcc 3 INT JP9 CUSTOMER NOTICE A * C2 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1454A 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. 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 SIGNIFICANTLYAFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CONTRACT NO. APPROVALS PCB DES. ENG. TOM GROSS 4 3 TITLE: SCHEMATIC 1.5A MONOLITHIC SYNCHRONOUS BUCK REGULATOR SIZE A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 TECHNOLOGY RB 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: 2 IC NO. REV LTC3601EMSE DEMO CIRCUIT 1454A Wednesday, October 21, 2009 1 SHEET 1 1 OF 1 A