5 4 3 2 1 SUMIDA CDR7D43MNNP-100NC L1 10UH D D U1 LT3480EMSE 4 + C2 C3 2.2UF,50V 1206 22UF,50V E2 SANYO 50CE22BS RUN SHDN EXTSS EXTSS 2 JP1 5 BD BOOST R2 110K FB 8 PGOOD 7 SW VIN RUN/SS R1 60.4K RT 10 VC 9 R3 590K SYNC 6 1 2 3 4 FIXED FREQ BURST MODE SYNC C5 0.1UF,50V 0603 E6 E7 VOUT 5V@2A C GND PGOOD C6 680PF R6 100K C7 0.1UF,50V 0603 C4 22UF,10V 1206 R5 20K C8 100PF E4 E5 R4 100K 11 C 1 3 E1 VIN 6.3V - 38V GND C1 0.47UF GND D1 DFLS240L 2 1 JP2 4 3 2 1 E3 SYNC B B CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. A 2. INSTALL SHUNT ON JP1 PINS 1&2. 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 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. 5 4 3 APPROVALS DRAWN: TECHNOLOGY KIM T. CHECKED: TITLE: SCHEMATIC SIZE DWG NO. APPROVED: ENGINEER: KEVIN H. DESIGNER: A DATE: 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only A 2A, 38V STEP-DOWN SWITCHING REGULATOR WITH SYNC FUNCTION DC1091A-1 * LT3480EMSE Tuesday, February 13, 2007 2 SHEET 1 REV A-1 1 OF 1