5 4 3 2 1 REVISION HISTORY ECO SVIN R1 2 APPROVED PRODUCTION DATE FRAN H. 4-12-11 18 C4 1uF SVIN 17 PVIN E2 12 R2 100k PVIN C13 47uF 11 C12 47uF PVIN C3 47uF PVIN C2 47uF 10 C1 47uF 7343 PVIN + D GND 24 DESCRIPTION E1 4 VIN 2.25V - 5.5V REV D U1 GND 21 E3 PGOOD LTC3617EUDD VTTR 3 E10 4.7M RUN JP1 1 SVIN C 19 C5 100nF RUN SW RUN 3 1 SW RT SW SD INT SW JP2 ITH SW 2 23 EXT 3 R5 20k C10 470pF 24 SW ITH SW VDDQIN VFB 6 C 7 8 L1 13 IHLP2525 OR IHLP2020 E6 220nH 14 R4 0 15 16 20 (OPT) C8 100uF 6.3V 1210 SYNC NOTE: UNLESS OTHERWISE SPECIFIED 2 25 E9 2. INSTALL SHUNTS AS SHOWN. CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY HZ FRAN H. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 A MONOLITHIC +/-6A STEP-DOWN REGULATOR FOR DDR MEMORY IC NO. DATE: REV. LTC3617EUDD N/A SCALE = NONE 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 SIZE 4 GND B 1. ALL RESISTORS ARE IN 0402. ALL CAPACITORS ARE IN 0402. 5 C9 (OPT) 7343 E7 E8 A + VTT VDDQIN/2 +/-6A 22 1 SYNC C7 100uF 6.3V 1210 R6 (OPT) PGND 2 EXT. REF VDDQIN C6 (OPT) C11 3 JP3 REF VIN B SW GND E5 5 SGND 1 R3 365k VTTR E4 R7 2 PGOOD 2 DEMO CIRCUIT 1707A Tuesday, July 05, 2011 2 SHEET 1 1 OF 1