5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE __ 2 PRODUCTION FAB FRAN H. 05-16-12 D D VIN E1 VOUT E5 VIN 1.8V - 5.5V C1 10uF 10V 1206 E2 GND L1 XAL4030 E3 3 VIN 9 SHDN/ SW 1 CAP 12 VOUT 11 4 PWM/SYNC 6 RT 1 2 3 R2 57.6k 1% 10 GND C7 1uF 25V 2 PGND VOUT 12V 500mA E6 GND R3 OPT 1% C VC 7 VCC VCC 5 C3 4.7uF 0805 13 JP1 C2 0.1uF 50V FB 8 GND RUN ON OFF C6 OPT 1210 U1 LTC3122EDE RUN C R4 1.02M 1% C4 OPT 0402 4.7uH C5 22uF 25V 1210 C8 330pF 0402 R6 86.6k 1% R5 113K 1% C9 OPT 0402 E4 SYNC VCC B MODE 1 PWM 2 3 BURST JP2 B R1 1M 1% CUSTOMER NOTICE 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. A NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0402 AND CAPACITORS ARE 0603. 2. INSTALL SHUNTS AS SHOWN. 5 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 APPROVALS TECHNOLOGY PCB DES. NC APP ENG. FRAN H. 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 15V, 2.5A SYNCHRONOUS BOOST DC / DC CONVERTER SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3122EDE DEMO CIRCUIT 1764A 2 05 - 16 - 12 SHEET 1 1 OF 1 A