L1 +Vin E1 + C1 opt. C Case 2.2uH CDRH5D16NP-2R2NC C2 4.7uF 10V * U1 GND E2 1 4 JP1 2 7 MODE SW 1 Vout 8 E3 C3 33pF JP3 1.8V 1 5 JP2 ON 2 OFF 3 FB SD R1 6 JP4 3.3V C4 2 X 22uF 10V PGND C5 2.2uF 10V E4 GND 249k GND Vout 1.8V/3.3V/5V 3 BURST FIXED FREQ Vin GND 0.75V-5V R3 499k 2 R2 20k R4 R5 604k 715k 9 3 JP5 5V 4 EXT SHDN E5 Assembly Version U1 DC1260A-A LTC3539EDCB DC1260A-B LTC3539EDCB-2 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CONTRACT NO. APPROVALS DATE DRAWN J. Wu 4/11/07 F. Hoffart 4/11/07 TECHNOLOGY TITLE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC3539EDCB/LTC3539EDCB-2 ENGINEER 2A Synchronous Boost Converter CHECKED SIZE CAGE CODE APPROVED Monday, April 06, 2009 DWG NO REV DC1260A SCALE: FILENAME: SHEET A 1 OF 1