1 2 3 4 D1 DFLS240L-7 2 A 5 6 7 8 L1 10uH 1 A U1 See Table VIN 6.3V-38V 60V Transient GND E1 E2 C11 0.1uF 50V C9 0.1uF 50V L2 2.2uH C10 4.7uF 50V + C2 22uF 63V C3 2.2uF 50V BD 2 exposed pad, solder side RT 10 BOOST VC 9 3 SW FB 8 4 VIN PGOOD 7 5 RUN/SS SYNC 6 R2 110k 1% R3 590k 1% R4 100k 11 B FB1 Bead 1 GND C1 0.47uF R1 40.2k 1% JP1 SHDN EXTSS EXTSS C4 22uF 10V C5 0.1uF 50V C7 0.1uF 50V C8 100pF VOUT 5V/2A E5 C12 0.1uF 50V R5 20k R6 100k 1 2 3 4 RUN FB2 Bead GND E6 C6 680pF B PGOOD E7 SYNC E3 E4 C C Table Customer Notice D 2 U1 DC1212A-A LT3480EDD DC1212A-B LT3685EDD LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY FB1,FB2 = Taiyo Yuden FBMJ3216HS800T 1 ASSEMBLY 3 LINEAR TECHNOLOGY CORPORATION 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. 4 5 1630 McCARTHY BLVD. MILPITAS, CA. 95035 PHONE (408) 432-1900 FAX (408) 434-0507 Title 2A, 38V Step-Down Switching Regulator D with SYNC Function and EMC Filters Size A Document Number Date: Monday, January 15, 2007 6 Rev A Demo Circuit 1212A-A/B 7 Sheet 1 of 8 1