5 D 4 3 D ISN 5.8V - 42V E12 FB1 74279226101 E1 C3 10uF 50V 1210 C15 0.1uF 50V 0402 GND 1 ISP VIN VEMI 2 L2 6.8uH IHLP3232DZER6R8M01 C10 10uF 50V 1210 SYNC 0 1210 C2 10uF 50V 1210 U1 LT8613EUDE R12 100k C12 0.1uF 50V 0402 R4 OPT 5 6 VIN 7 VIN VIN 4 E8 1 E5 3 2 1 SYNC C GND R3 OPT R1 + C1 22uF 63V SUNCON 63CE22BS EN/UV E2 R2 OPT GND 27 JP1 E9 28 21 ICTRL TR/SS 2 E6 3 E7 E11 C7 1uF 25V SYNC R8 60.4k B C4 0.1uF 0402 SW SW SW SW SW 15 16 17 18 19 L1 3.3uH R5 0.008 IHLP2525EZER3R3M01 ICTRL INTVCC TR/SS RT ISP ISN BIAS PG FB 2010 ISP R6 IMON 8 9 PGND 10 PGND PGND C8 0.1uF * 20 25 C5 OPT ISN SEE DEMO MANUAL VOUT E3 C6 100uF 10V 1210 0 VOUT 5V / 6A * C11 1uF C GND E4 R7 26 0 22 R9 23 R10 24 R11 243k 100k 1Meg C9 11 12 GND 13 GND 14 GND GND 29 GND IMON EN/UV BST 10pF B PG E10 NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. 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 TITLE: CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only SCHEMATIC 42V, 6A MICROPOWER SYNCHRONOUS STEP-DOWN REGULATOR WITH CURRENT SENSE SIZE IC NO. REV. LT8613EUDE N/A 3 DEMO CIRCUIT 2011A DATE: SHEET Thursday, March 26, 2015 1 1 OF 1 A