5 4 3 2 1 REVISION HISTORY DESCRIPTION APPROVED ECO REV 4 PRODUCTION DATE WALKER B. 5-10-13 VSYS L2 C17 0.1µF 50V 5 R1 1M 6 GND R2 INTVCC 4 OPT 1 R22 100k 23 E4 SYNC 24 E6 INTVCC GND 17 E8 C R6 2 100k 3 RCBL R7 12.4k 0603 E10 C6 1µF 25V 0603 C5 0.1µF 8 BST EN/UV SW SYNC SW RCBL SW ICTRL ISP INTVCC ISN TR/SS SYS RT PG PGND USB5V VSYS 5.xV / 0.1A D GND 16 C3 0.22µF 16V 0603 L1 VIN 13 3.3µH C4 XAL5030-332MEC 47µF 10V 1210 14 15 VOUT R11 C25 47µF 10V 1210 R3 0 1206 R4 VCABLE E15 0.3 2W 0830 C-GND GND R13 E18 OPT 1206 E17 0.02 1206 C9 OPT 10V 1206 VCABLE E16 C11 1µF 25V 0805 E3 E5 21 22 18 C13 R8 19 49.9k C12 1µF 25V 0805 1nF R9 20 E7 VCABLE 5V / 2.1A C_GND VOUT 5.xV / 2.1A C E9 GND 10k PG PGND E11 R14 OPT X4 OPEN SET 3 1 VCABLE 2 9 10 N/C ICTRL 7 R10 16.5k (2MHz) 0603 VIN N/C C2 4.7µF 50V 1206 N/C E2 + 12 C8 4.7µF 50V 1206 C7 4.7uF 50V 1206 C16 0.1µF 50V C10 E13 0.1µF 25V 0603 E12 U1 LT8697EUDD GND C15 0.1µF 50V C1 22µF 63V SUNCON 63CE22BS 11 4.7µH N/C VIN 6V - 42V FB1 25 D VIN E1 VCABLE 3 VSYS R5 18 2512 X5 V+ R16 43.2k 0603 R15 75k 0603 1 B R23 18 2512 2 1. ALL RESISTORS ARE 0402. ALL CAPACITORS ARE 0402. DIV 5 2 C14 2.2nF 0603 R21 2 1206 R24 2 1206 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. 5 4 OPEN Q1 ZXMN3A14F 1 CUSTOMER NOTICE A 3 3 R19 10k 0603 J3 DATA+ 3 R18 49.9k 0603 R17 49.9k 0603 3 1 JW APP ENG. WALKER B. DATA- OPEN DX2 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 TECHNOLOGY TITLE: SCHEMATIC USB 5V 2.5A OUTPUT, 42V INPUT SYNCHRONOUS BUCK WITH CABLE DROP COMPENSATION N/A 2 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE SCALE = NONE B 1 2 3 4 USB X3 APPROVALS PCB DES. 1 2 3 4 2 SHORT 2 OUT 4 SET 2 1 3 GND NOTES: UNLESS OTHERWISE SPECIFIED V+ R20 2M 0603 U2 LTC6900CS5 X1 OPEN D+ 3 1 1 OPEN 2 IC NO. REV. LT8697EUDD DEMO CIRCUIT 1973A MODIFY DATE: Friday, May 17, 2013 4 SHEET 1 1 OF 1