5 4 3 2 1 SUMIDA CDRH8D43-6R8 L1 6.8UH D D U1 LT3693EDD 4 + C2 C3 4.7UF,50V 1210 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 63.4K RT 10 VC 9 R3 590K SYNC 6 1 2 3 4 E7 JP2 SYNC OFF SYNC ON PGOOD 1 2 3 E4 SYNC B B CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. A C C6 1000PF R6 100K C7 0.22UF,50V 0805 C4 47UF,10V 1206 VOUT [email protected] C5 0.1UF 50V 0603 E6 GND R5 15K C8 100PF E3 E5 R4 100K 11 C 1 3 VIN E1 6.3V - 36V GND C1 0.47UF GND D1 MBRA340T3 2 1 2. INSTALL SHUNT ON JP1 AND JP2 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 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 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 3.5A, 36V STEP-DOWN SWITCHING REGULATOR WITH SYNC FUNCTION DC1272A * LT3693EDD Friday, August 24, 2007 2 SHEET 1 REV A 1 OF 1