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 100K INTVcc C1 R9 TRACK E7 1 0 Ohm JP5 TRACK 3 R10 (Opt) 13 SS (SOFT-START) 1 C 15 16 INTVcc SYNC C6 (Opt) MODE/SYNC 1 2 E8 (FORCED CONTINUOUS MODE) FCM 2 4 7 6 PGOOD INTVCC BOOST C9 2200pF BURST MODE SYNC 2.2uF 16V 0603 U1 LTC3604EUD 2 D1 CMDSH-3TR (Opt) 3 4 5 6 1210 C3 22uF 16V 1210 14 TRACK SW SW MODE/SYNC VON PVIN PVIN FB RUN ITH RT 3 4 8 17 12 9 + GND B C4 47uF 6.3V 1210 VISHAY R3 115K 1% C5 10pF RITH CITH 14K 150pF C7 (Opt) 1210 C10 (Opt) 1210 VOUT 1.2V/1.8V/3.3V @ 2.5A E4 C GND E5 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 RON 11 JP6 VIN 4V - 15V L1 1.0uH IHLP-2020BZ-ER-1R0M01 0 Ohm PGND SGND 10 C8 0.1uF 25V 0603 * JP4 USER SELECT C2 3.3uF 35V RUN E3 ON 1 2 2 3 OFF ITH FREQ 1 INTVcc JP7 R8 1M 1 1MHz B 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 * 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. C2 IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC1610A 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. 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 LTC3604EUD 1 DEMO CIRCUIT 1610A Monday, November 23, 2009 SHEET 1 1 OF 1 A