5 4 3 2 1 REVISION HISTORY ECO REV _ 2 DESCRIPTION APPROVED DATE PRODUCTION WALKER B. 03-26-12 D D GND U1 LT8610EMSE VIN E1 + C1 22uF 63V E2 C2 4.7uF 50V 1206 R1 1M 5 SUNCON 63CE22BS R6 OPT 6 4 EN/UV E6 1 SYNC E5 3 2 1 SYNC GND C 13 JP1 2 C7 1uF 0603 25V GND 3 R2 60.4k E9 7 8 VIN BST EN/UV SW SYNC SW INTVCC SW TR/SS BIAS RT PG PGND FB PGND FB1 B VEMI C3 4.7uF 50V 1206 11 VOUT E3 C6 47uF 10V 1210 14 E4 10 GND C R3 15 R4 16 49.9k 1Meg R5 412k C5 4.7pF PG B C10 4.7uF 50V 1206 APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY JW THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only WALKER B. TITLE: SCHEMATIC IC NO. DATE: REV. LT8610EMSE N/A SCALE = NONE A 42V, 2.5A MICROPOWER SYNCHRONOUS STEP-DOWN REGULATOR SIZE 5 VOUT 3.3V / 2.5A VIN NOTES: UNLESS OTHERWISE SPECIFIED A L1 4.7uH E10 CUSTOMER NOTICE 1. ALL RESISTORS ARE 0402. ALL CAPACITORS ARE 0402. 9 17 C8 0.1uF L2 4.7uH C4 0.22uF 16V 0603 VIN TR/SS E7 12 GND VIN 3.8V - 42V 2 DEMO CIRCUIT 1749A Tuesday, April 10, 2012 SHEET 1 2 1 OF 1