5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION 1 APPROVED PRODUCTION JIM N. DATE 01-17-12 D D VIN E1 C8 VIN 2.5V - 15V E2 MODE 1 BURST MODE 2 3 FIXED FREQ JP2 + C9 OPT 7343 C2 1uF E3 VOUT 1.8V / 300mA 15uH LPS4018 C7 12pF U1 LTC3103EDD VIN 1 10 7 R4 1M 1% 6 4 VIN BST MODE SW RUN FB VCC GND C3 22uF 1206 C4 1uF PGOOD NC 3 2 8 C E5 5 PGOOD 9 R6 1M 1% 11 C6 1uF R3 1M 1% R1 2M 1% R2 2.21K GND GND C C1 10uF 0.1uF VOUT L1 E4 GND VIN RUN 1 2 3 ON OFF R5 1M 1% ALL CIRCUIT GND CONNECTIONS SHOULD RETURN TO PIN 4 CONNECT GND SIDE OF R6 DIRECTLY TO PIN 4 R7 OPT 1% JP1 C5 OPT B B CUSTOMER NOTICE A NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0402 AND CAPACITORS ARE 0603. 2. INSTALL SHUNTS AS SHOWN. 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 3 APPROVALS PCB DES. APP ENG. TECHNOLOGY LT JIM N. 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, 300mA, SYNCHRONOUS STEP-DOWN DC/DC CONVERTER WITH 1.8uA QUIESCENT CURRENT SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3103EDD DEMO CIRCUIT 1883A Tuesday, January 17, 2012 1 SHEET 1 1 OF 1 A