A B C D E REVISION HISTORY ECO REV __ RTR1 TRACK 3 4 EXT SS 6 INT SS U1 VIN 1 RPG1 100k PGOOD1 TP3 3 4 CFFW1 R3 21 Track/SS1 11 Run1 15 PGood1 17 SW1 16 Ith1 RITH1 43.2k 1% C1 10pF R5 CITH1 220pF 22 PVin1 6 PVin2 7 GND 20 TP2 PGOOD2 TP10 VIN RPG2 3 100k 12 2 CSS2 1 INT SS 1 2 EXT SS 3 4 RTR2 TRACK 5 6 100k TRACK1 7 8 4.7M TRACK2 TP9 Rt/Sync J4 TRACK / SS2 RSS2 0.01uF Track/SS2 1 OFF PGood2 Run2 R1 845k 1% R9 GND TP12 JP2 RM3 301k 1% 2.5V EBMCV J9 1 JP3 3.3V RM4 100k 1% JP4 3 ECBM USER SELECT VOUT2 L2 SW2 9 SW2 8 Ith2 3 SVin 10 23 TP5 OPT PVin2 13 4 FB1 PGND CFILT 1uF 4 1.8V 267k 1% R7 PVin1 19 SGND RFILT 24 COUT5 100uF OPT FB2 VOUT2 3A 0.47uH VISHAY IHLP2020BZERR47M01 COMP2 JITH2 2 COUT2 47uF 6.3V 1210 SVIN ICMP 1 2 ECMP 3 4 COUT4 10uF 6.3V 0805 10pF CFFW2 COUT8 100uF 6.3V OPT 3 TP6 + COUT6 100uF OPT GND TP7 R2 25 CIN1 22uF 6.3V 1206 5 CIN2 22uF 6.3V 1206 SRLim CIN3 22uF 6.3V 1206 Mode CIN4 22uF 6.3V 1206 14 CIN5 100uF + OPT Phase + + 10pF 187k 1% 24 18 ON SW1 JP1 422k 1% VIN 7343 RUN2 J2 2 LTC3615EFE 2 ON 3 1 3 ECMP COUT7 100uF 6.3V OPT GND JITH1 4.7M 0.01uF SVIN COMP1 COUT3 10uF 6.3V 0805 COUT1 47uF 6.3V 1210 TP4 2 2 5 VIN SVIN RSS1 1 ICMP TP1 CIN6 100uF 03-19-10 SET CSS1 VIN 2.25V - 5.5V DATE TOM G. VOUT1 3A 0.47uH VISHAY IHLP2020BZERR47M01 J3 TRACK / SS1 RTR3 OPT OFF APPROVED VOUT1 EXT 100k 4 RUN1 J1 PRODUCTION L1 TRACK1 TP11 DESCRIPTION 2 RT 178k 1% C2 10pF 348k 1% RITH2 43.2k 1% GND TP14 CITH2 220pF RTR4 OPT J6 RT / SYNC INT SYNC RT2 2 OPT 1 2 RT 3 4 EXT SYNC 5 6 2 TP8 J5 PHASE RTR5 VOUT1 316k 1% RTR6 105k 1% 180 deg OUT PH (OUT-OF-PHASE) 90 deg OUT PH (OUT-OF-PHASE) IN PHASE RM1 866K 1% RM2 1.13M 1% TP13 (BURST MODE EXTERNAL CLAMP VOLTAGE) 1 2 3 4 5 6 SVIN TRACKING 1 2 MIN 3 4 ADJ 5 6 MAX 7 8 ECBM R6 2 PSM 3 4 FCM 5 6 ECBM 7 8 ICBM (PULSE-SKIP MODE) (FORCED CONTINUOUS MODE) (EXTERNAL CLAMP BURST MODE) (INTERNAL CLAMP BURST MODE) B 1.5V R8 JP7 1.8V 174k 1% JP8 OPT CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A JP6 232k 1% R10 1 1.2V 348k 1% RSRLIM 100k 1% J7 MODE ECBM BMECV 1 R4 J8 SRLIM SYNC JP5 C USER SELECT APPROVALS PCB DES. A.K. APP ENG. TOM G. TECHNOLOGY 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 DUAL 3A MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR SIZE N/A SCALE = NONE D DATE: IC NO. LTC3615EFE REV. 2 DEMO CIRCUIT 1572A Friday, April 30, 2010 SHEET 1 E OF 1 1