REVISION HISTORY ECO REV __ DATE PRODUCTION MOLLY Z. 04-05-10 C1 22uF 6.3V 0805 E1 GND E2 U1 LT3502EDC VIN VIN 4.5V - 40V APPROVED L1 15uH CDRH4D22/HP-150 VOUT VOUT 3.3V / 500mA 1 DESCRIPTION 1 VIN SW 8 E3 VOUT + C4 10uF 50V opt. C3 1uF 50V 0805 2 3 C5 opt. R1 31.6K 4 BD EXPOSED BOOST PAD FB SHDN GND GND DA GND C2 0.1uF 16V 7 D1 MBR0540T1 6 5 9 E4 R2 10.0K VIN R3 1 JP1 RUN/SS ON 2 3 OFF CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN 0402. ALL CAPACITORS ARE IN 0402. 22K 0603 E5 C6 opt. 0603 APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. MOLLY Z. 2. INSTALL SHUNTS AS SHOWN. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. TECHNOLOGY JW SCALE = NONE 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 40V, 500mA, 1.1MHz BUCK REGULATOR IN 2x2 DFN SIZE IC NO. REV. LT3502EDC N/A 1 DEMO CIRCUIT 1221B DATE: 04-05-10 SHEET 1 OF 1