A B C D E REVISION HISTORY PGOOD COMP TP3 INT EXT 4 4 10 11 17 TP1 + CIN5 47uF 10V CIN3 CIN4 10uF 6.3V CIN1 CIN2 22uF 6.3V GND RFILT1 18 24 PVIN PVIN PVIN PVIN SVIN CFILT1 1uF SW1 SW1 SW1 SW1 16 15 14 13 SW2 SW2 SW2 SW2 8 7 6 5 ITH 23 2 Rt / SYNC SYNC INT SYNC 1 2 Rt 3 4 EXT SYNC 5 6 TP8 J6 GND TP9 2 100k 1% COUT3 10uF 6.3V COUT4 100uF Opt TP4 + COUT5 100uF Opt. GND TP5 CFF1 22pF R1 165k 1% R2 3 JP1 1.2V R3 1 2 DDR 3 4 MIN 5 6 ADJ 7 8 MAX JP2 1.8V 82.5k 1% JP3 2.5V 52.3k 1% R5 JP4 3.3V 36.5k 1% R6 RM3 JP5 301k USER SELECT OPT. 2 1% J4 2 RM1 866k COUT2 47uF 6.3V VOUT 4A 165k 1% RT1 165k 1% SLEW RATE RSRR1 10-30-09 22 R4 GND TP6 DATE TOM G. RITH1 12.7k 5% SGND J3 CSS1 0.01uF VFB PGND 6 3 5 APPROVED TRACK/SS 25 EXT SS 24 NC NC 4 12 9 2 3 MODE 1 21 RTR1 100k RTR2 OPT INT SS TRACK COUT1 47uF 6.3V CITH1 220pF TRACK / SS DDR TP7 3 RSS1 4.7M DESCRIPTION PRODUCTION 4 VISHAY IHLP2525CZERR47M01 C1 10pF 1 TRACK RSD1 4.7M 1 L1 0.47uH RUN 2 1 J2 19 RT/SYNC RUN ON OFF REV 1 CC1 opt. 3 TP2 1 J5 LTC3614EUDD 2 U1 PGOOD VIN 2.25V-5.5V 20 3 RPG1 100k ECO 1 RM2 1.13M (FORCED CONTINUOUS) FC (PULSE-SKIP MODE) PSM (BURST MODE EXTERNAL CLAMP) BMEC J7 J1 MODE 1 2 3 4 5 6 7 8 3 SET EXT VBMCV (VOUT BURST MODE CLAMP VOLTAGE) RM4 100k 1% (BURST MODE) BM 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. BMECV 1 TP10 (BURST MODE EXTERNAL CLAMP VOLTAGE) THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B C CONTRACT NO. APPROVALS TECHNOLOGY PCB DES. ANTONINA K. ENG. TOM G. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 4A MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR SIZE A IC NO. REV LTC3614EUDD 2 DEMO CIRCUIT 1467A DATE: D Friday, April 09, 2010 SHEET E 1 OF 1 1