5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION __ 1 PRODUCTION APPROVED DATE 12-5-14 Goran P. D D VIN E1 VIN 1.8V - 5.5V VOUT VOUT C1 10uF 10V 1206 GND L1 XAL4030 U1 LTC3121EDE E3 3 RUN 9 C ON OFF 4 1 2 3 6 R2 57.6k 1% 10 2 SW SHDN/ CAP PWM/SYNC VOUT RT FB GND VC PGND VCC 1 12 11 C7 1uF 25V 12V 500mA * E6 GND * SEE DEMO MANUAL C2 0.1uF 50V R3 OPT 1% 8 C 7 5 VCC C3 4.7uF 0805 13 JP1 VIN C5 22uF 25V 1210 R4 1.02M 1% C4 OPT 0402 6.8uH GND E2 RUN E5 C8 1nF 0402 R6 82.5k 1% R5 113K 1% C9 10pF 0402 E4 SYNC VCC B MODE PWM BURST B 1 2 3 JP2 R1 1M 1% 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. A NOTE: UNLESS OTHERWISE SPECIFIED TECHNOLOGY HZ Goran P. 5 TITLE: SCHEMATIC SIZE 2. INSTALL SHUNTS AS SHOWN. 4 3 A 15V, 1.8A SYNCHRONOUS BOOST DC / DC CONVERTER 1. ALL RESISTORS ARE 0402 AND CAPACITORS ARE 0603. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3121EDE DEMO CIRCUIT 2372A 1 8-18-15 SHEET 1 1 OF 1