5 4 3 2 1 REVISION HISTORY ECO REV _ 1 DESCRIPTION APPROVED DATE PRODUCTION ZHONGMING Y. 09-30-11 D D L1A 15uH +VOUT R2 100k E3 PGOOD R3 255k C3 4.7uF 16V 9 0805 3 1 4 C5 68nF C6 0.1uF B C7 470pF R4 1.43k R5 27.4k VIN 2 DRIVE 10 1 NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. 5 C2 1uF 50V 0805 EN/UVLO VIN > 4V INTVCC GATE SS VC SENSE RT 8 OPT Q1 RJK0652DPB 4 7 RCS 0.005 2010 E7 SYNC SYNC 3 ON 2 1 OFF JP2 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. KIM T. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. ZHONGMING Y. 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. 4 1A D1 1N4148WT 2 CUSTOMER NOTICE A VIN > 2.8V 5 12 0.5A 1 2 3 1 2 3 11 R6 0 FBX R1 249k +VOUT 12V / C SYNC SHDN E6 * * 5 RUN +VOUT +VOUT 6 EN/UVLO JP1 D3 PDS360 1 COUT2 47uF 16V 1210 RFBB 15.8k U1 LT3759EMSE E4 3 2 COUT1 47uF 16V 1210 1210 C EN/UVLO C1 4.7uF 50V RFBS 102k GND L1B 15uH 2 SUN ELECT 50CE22BS E2 CIN2 10uF 50V 1210 E5 4 3 22uF 50V CIN1 10uF 50V 1210 1 + CIN3 PGOOD PGOOD VIN GND GND E1 13 VIN 2.8V - 36V DRQ127-150-R 3 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC SEPIC CONVERTER WITH WIDE INPUT VOLTAGE RANGE SIZE N/A SCALE = NONE B DATE: 2 IC NO. LT3759EMSE DEMO CIRCUIT 1787A REV. 2 09/30/2011, 12:52 PM SHEET 1 1 OF 1 A