5 4 3 RUN/SS 1 ON 2 JP1 3 OFF 2 1 R1 OPT CSS 0.1UF INTVCC JP3 1.5V R9 R10 60.4K 40.2K E7 C5 47PF JP4 1.8V JP5 2.5V R11 30.1K R12 19.1K C6 OPT R8 137K SGND SGND VON PGOOD VRNG ITH FCB SGND ION SGND VFB EXTVCC SGND SGND SGND SGND PVIN SW PGND 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 JP2 1.2V R7 60.4K 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 U1 LTC3610EWP B EXTVCC E2 C7 OPT CIN3 150UF 35V SANYO 35ME150WXV CIN4 CIN5 1210 OPT TOKO FDV0630 J2 E3 PGND VOUT CO1 CO2 + 100UF 6.3V 1812 CO3 CO4 330UF 6.3V 7343 OPT E5 VOUT 12A MAX. J3 CO6 CO5 22UF 6.3V 0805 E6 Q1 SUD50N03 VOUT C10 4.7UF 6.3V C9 1UF 35V R16 10K J5 VOUT B J6 IOSTEP R5 0.005 2512 E8 IOSTEP CLK DYNAMIC LOAD CIRCUIT NOTES: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE 0603. 2. INSTALL SHUNT ON JP1 PINS 1 AND 2, JP3. CUSTOMER NOTICE 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. 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 J4 PGND 1 C8 4.7UF 16V 0805 CIN6 CIN7 1206 OPT L1 0.47UH R13 1 INTVCC EXTVCC CIN1 + CIN2 10UF 35V 1206 3 C3 100PF C4 R6 1000PF 7.5K VOUT SELECT R3 11K VOUT PGOOD C 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 C2 0.01UF VIN E1 4.5V-24V VIN SGND E4 J1 R14 2 RUN/SS R2 OPT R4 100K PGOOD 3 2 1 D SW SGND SGND RUN/SS BOOST NC NC SW PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN PVIN INTVCC FCB INTVCC SGND SGND SVIN SVIN SVIN INTVCC INTVCC INTVCC SW PGND PGND PGND PGND PGND PGND PGND PGND PGND DCM JP6 CCM D1 C1 CMDSH-3 0.22UF 16V 2 1 BOOST 2 D DWG NO. A DC1129A-1 * LTC3610EWP Thursday, August 09, 2007 DATE: 2 SHEET 1 REV A-1 1 OF 1