5 4 3 2 1 D D VOUT ENABLE SHUTDOWN TOKO D52LC R1 OPT VIN C2 1uF 50V 1206 X7R + C1 10uF 50V 7 C5 OPT 0603 C NC 9 E2 GND E3 VOUT 5V@200mA VSW 4 BIAS 2 GND 6 C4 22uF 6.3V 1206 X5R U1 LT3470EDDB GND E1 VIN 5.5V-40V SHDN 8 BOOST 3 X5R FB 1 C6 22pF NPO R3 200k 1% 5 C L1 33uH C3 0.22uF JP1 R2 604k 1% B B NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE 0402. A 2. INSTALL SHUNT ON JP1 (1&2). CUSTOMER NOTICE CONTRACT NO. 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS DRAWN: TECHNOLOGY KIM T. CHECKED: TITLE: SCHEMATIC DESIGNER: A 40V MICROPOWER DFN BUCK REGULATOR APPROVED: ENGINEER: KEITH S. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only WITH INTEGRATED BOOST AND CATCH DIODES SIZE DWG NO. A DC1037A-1 * LT3470EDDB Wednesday, February 01, 2006 DATE: 2 SHEET 1 REV A-1 1 OF 1