5 4 3 2 1 D D L1 7.7UH SUMIDA CDR6D28MN-7R7 C1 0.47UF VIN C 4.5V-34V E1 C4 22UF,50V SANYO 50CV22BS C5 10UF,35V 1206 BD RT 2 BOOST VC 3 SW FB 8 4 VIN BIAS 7 5 RUN/SS PGOOD GND GND 10 E3 R2 102K R1 60.4K 9 R3 165K 6 R5 19.1K 11 + 1 GND D1 DFLS240L 2 1 U1 LT3684EMSE C6 22UF,10V 1206 R4 100K C7 1UF 10V 0603 E4 C8 330PF E7 E2 E5 VOUT 3.3V@2A C GND PGOOD VIN 1 RUN 2 SHDN 3 EXTSS R6 100K 4 C9 0.1UF,50V 0603 JP1 B B EXTSS E8 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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A CONTRACT NO. APPROVALS TITLE: CHECKED: APPROVED: ENGINEER: KEVIN H. DESIGNER: 4 3 SIZE DATE: 2 LT3684EMSE 2A, 34V Step-Down Switching Regulator A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 TECHNOLOGY DRAWN: Antonina K 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only DWG NO. REV DC1188A A Wednesday, December 06, 2006 SHEET 1 1 OF 1 A