A B C D J5 COMP INT EXT 3 1 PGOOD TP3 2.25V - 5.5V GND + CIN3 100uF 10V CIN4 100uF opt. CIN2 22uF 6.3V CIN1 22uF 6.3V RFILT1 24 LTC3612EFE 3 U1 15 16 20 1 PVin PVin PVin_d SVin CFILT1 1uF SW SW SW SW 19 17 14 12 Ith 6 3 TP2 TP7 100k 1% EXT SS 5 INT SYNC 1 2 Rt 3 4 EXT SYNC 5 6 RT2 opt. 1% RTR2 opt. 1% 4 6 Vfb 5 R2 R3 RM1 4.87M 1% SYNC FCM 1 2 PSM 3 4 BMEC 5 6 BM 7 8 1 2 ON 3 4 OFF R4 36.5k 1% R6 RM5 opt. 1% COUT2 33uF 6.3V COUT3 100uF 6.3V opt. COUT4 100uF 6.3V opt. COUT5 + COUT6 10uF 100uF 6.3V opt. TP5 CITH1 1000pF GND CFF1 22pF 3 JP1 R1 165k 1% 1.2V JP2 1.8V Voutset JP3 2.5V JP4 3.3V JP5 RM3 301k 1% TP6 USER SELECT J9 1 GND 2 RM4 100k 1% 3 TP9 GND SET EXT VBMCV (Vout Burst Mode Clamp Voltage) 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. BMECV TP10 (Burst Mode External Clamp Voltage) A VOUT 3A opt. CUSTOMER NOTICE 1 C1 10pF 52.3K 1% R5 RM2 4.87M 1% J1 MODE CC1 opt. COUT1 33uF 6.3V RITH1 15k 1% 82.5K 1% RT1 165k 1% 4 TP4 165K 1% J4 DDR 2 (BURST MODE) 2 NC NC NC CSS1 0.01uF J6 Rt / SYNC TP8 (FORCED CONTINUOUS MODE) (PULSE-SKIP MODE) (BURST MODE EXTERNAL CLAMP) DDR PGND RTR1 INT SS 1 TRACK 3 Track/SS 8 SGND TRACK J3 TRACK/SS 18 13 11 10 3 RSS1 4.87M 1% Mode 1 RSD1 4.87M 1% 7 4 J2 Run 21 2 Rt/Sync 2 9 RUN ON OFF L1 0.47uH VISHAY IHLP2020BZERR47M01 2 TP1 VIN 2 RPG1 100k 5% PGood 4 E B C CONTRACT NO. APPROVALS DRAWN Antonina K. DATE 7/21/09 CHECKED DESIGNER LTC3612EFE 1 3A MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR APPROVED ENGINEER TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 T. Gross 7/21/09 SIZE CAGE CODE Wednesday, August 05, 2009 SCALE: FILENAME: D DWG NO REV A DC1574A SHEET 1 E OF 1