5 4 3 2 1 REVISION HISTORY ECO REV __ 2 2-1 DESCRIPTION APPROVED DATE WALKER B. 02-02-10 WALKER B. 1-6-16 PRODUCTION REBUILD CHANGED Q1,Q2,Q3 VIN E1 + D C6 1uF 50V 0805 E2 VIN VIN Q1 Q2 U1 R2 124K 14 R5 100K C 15 RT HG CBOOT 19 R16 0 C7 0.22uF VCC_INT 5 VREF SW C13 2nF R7 45.3K 1 8 CTRL1 LG C9 C11 47uF 1210 R17 OPT 1206 20A @ 6V C8 C10 150uF C18 OPT C GND E5 18 GND Q3 BSC011N03LSI Q4 OPT 20 4 E10 D2 DFLS240L 1 2 3 E6 VOUT * E4 C12 22uF 0805 R8 100K CTRL1 R4 0.0025 2512 D1 DFLS140 SYNC SYNC E8 L1 1.3uH WE 7443551130 4 2 R3 100K EN/UVLO 1 E3 BSC080N03LS G 17 5 6 7 8 EN/UVLO 4 2 LT3741EFE R1 374K 5 6 7 8 E9 1 2 3 GND 1 GND C4 C5 4.7uF 1210 C2 C3 4.7uF 1210 C1 100uF,50V 50CE100LX 3 6V - 36V VIN VIN * D R9 OPT E7 9 R12 680K C15 10nF 13 SS SENSEN VC FB R15 66.5K GND 16 7 GND 2 GND GND B SENSEP 11 CTRL2 12 R11 40.2K R10 10 C14 33nF R13 10 B 10 C16 OPT R14 10k 21 6 CTRL2 C17 5nF NOTE: UNLESS OTHERWISE SPECIFIED A * - SEE QUICK START GUIDE 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. CUSTOMER NOTICE 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY A.K. WALKER B. TITLE: SCHEMATIC HIGH POWER CONSTANT CURRENT, CONSTANT VOLTAGE SYNCHRONOUS BUCK CONTROLLER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: IC NO. LT3741EFE REV. 2-1 DEMO CIRCUIT 1602A Thursday, January 07, 2016 SHEET 1 1 OF 1 A