4 3 1 R1 1M CSS 0.1UF OPTIONAL SNUBBER CIRCUIT INTVCC D DCM CCM E4 PGOOD C3 100PF C4 R6 1000PF 4.99K C VOUT SELECT JP2 1.5V JP3 1.8V R9 R10 66.5K 49.9K E7 R7 100K C5 47PF JP4 2.5V JP5 3.3V R11 31.6K R12 22.1K C6 OPT R8 255K SGND SGND RUN/SS BOOST NC NC SW PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 SGND SGND VON PGOOD VRNG ITH FCB SGND ION SGND VFB EXTVCC SGND SGND SGND SGND PVIN SW PGND U1 LTC3611EWP PVIN PVIN PVIN PVIN PVIN SW SW SW SW SW SW SW SW PGND PGND PGND 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 SGND VOUT R17 0 B EXTVCC E2 C7 OPT CIN1 + CIN2 4.7UF 50V 1210 J1 CIN3 100UF 50V CIN4 CIN5 4.7uF 50V 1210 OPT SANYO 50ME100WX L1 1.0UH VIN E1 9V - 32V J2 E3 PGND VOUT CO1 CO2 + 100UF 6.3V 1812 CO3 CO4 330UF 6.3V 7343 OPT E5 J3 CO6 CO5 22UF 6.3V 0805 NOTES: UNLESS OTHERWISE SPECIFIED Q1 SUD50N03 VOUT C10 4.7UF 6.3V C9 0.1UF 50V R16 10K A 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE 0603. 2. INSTALL SHUNT ON JP1 PINS 1 AND 2, JP3. CONTRACT NO. 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 CIRUIT 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. 5 4 3 APPROVALS DRAWN: CHECKED: APPROVED: TECHNOLOGY KIM T. J5 VOUT B J6 IOSTEP 5mV/A R5 0.005 2512 E8 IOSTEP CLK 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC A HIGH INPUT VOLTAGE AND HIGH CURRENT DENSITY STEP-DOWN CONVERTER ENGINEER: MANJING X. SIZE DESIGNER: C E6 DYNAMIC LOAD CIRCUIT CUSTOMER NOTICE VOUT 10A MAX. J4 PGND 1 C8 4.7UF 16V 0805 CIN6 CIN7 1210 OPT VOUT VISHAY IHLP-4040DZ-11 R13 2 INTVCC EXTVCC C11 OPT 0805 VIN SGND PGOOD R3 10K D 0805 R14 4.7 RUN/SS JP6 C2 0.01UF R4 100K 3 2 1 R18 OPT SW 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 R2 35.7K INTVCC SGND SGND SVIN SVIN SVIN INTVCC INTVCC INTVCC SW PGND PGND PGND PGND PGND PGND PGND PGND PGND INTVCC FCB D1 C1 SDM10K45 0.22UF 16V 2 1 BOOST 3 RUN/SS 1 ON 2 3 OFF JP1 2 2 5 DWG NO. A DC1318A * LTC3611EWP Thursday, January 17, 2008 DATE: 2 SHEET 1 REV A 1 OF 1