Vout 3.3V/500mA GND L1 VOUT R4 0 E2 U1 LT3502EDC VIN Vin 5V-40V 1 E3 VOUT + C4 10uF 50V opt. 15uH C1 22uF 6.3V E1 C3 1uF 50V C5 opt. R1 31.6K VIN 2 BD 3 FB 4 SHDN EXPOSED PAD GND GND SW 8 BOOST 7 DA 6 GND 5 C2 0.1uF 16V D1 PMEG4005AEA 9 E4 R2 10.0K VIN R3 1 JP1 RUN/SS ON 22K 2 OFF C6 opt. 3 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. E5 CONTRACT NO. APPROVALS DRAWN DATE J. Wu 4/18/07 M. Zhu 4/18/07 CHECKED TECHNOLOGY TITLE DESIGNER LT3502EDC 40V, 500mA, 1.1MHz Buck Regulator in 2x2 DFN APPROVED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SIZE CAGE CODE Thursday, April 19, 2007SCALE: FILENAME: DWG NO REV DC1221A SHEET A 1 OF 1