5 4 3 2 1 REVISION HISTORY PGOOD E6 D ECO REV 1 1 DESCRIPTION PRODUCTION APPROVED DATE TOM G. 11-23-09 INTVcc E1 D R1 INTVcc 100K C1 D1 CMDSH-3TR (Opt) 2.2uF 16V R9 TRACK E7 1 0 Ohm JP5 TRACK 3 R10 (Opt) U1 LTC3604EMSE 2 4 C9 2200pF SS (SOFT-START) C SYNC C6 (Opt) 1210 MODE/SYNC 1 2 E8 (FORCED CONTINUOUS MODE) FCM 6 3 4 5 6 C3 22uF 16V 1210 TRACK 15 MODE/SYNC 12 5 INTVCC 11 13 14 INTVcc BURST MODE SYNC 16 PGOOD C8 0.1uF 25V BOOST SW SW 1 2 VON 7 PVIN PVIN FB RUN ITH 3 4 10 17 + C10 (Opt) 1210 C7 (Opt) 1210 VOUT 1.2V/1.8V/[email protected] E4 C GND E5 RITH CITH 14K 150pF GND E9 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 C4 47uF 6.3V 1210 R3 115K 1% C5 10pF 9 RT SGND SGND PGND 8 VIN VISHAY RON 0 Ohm JP6 4V - 15V L1 1.0uH IHLP-2020BZER1R0M01 * JP4 USER SELECT C2 3.3uF 35V GND E3 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 NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0402 CUSTOMER NOTICE 2. INSTALL SHUNTS AS SHOWN. 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 SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CONTRACT NO. APPROVALS ENG. TOM G. 4 3 TITLE: SCHEMATIC 2.5A MONOLITHIC SYNCHRONOUS BUCK REGULATOR SIZE A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 TECHNOLOGY PCB DES. ANTONINA K. 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 LTC3604EMSE 1 DEMO CIRCUIT 1611A Friday, January 22, 2010 SHEET 1 1 OF 1 A