VIN GND SHDN SYNC GND OPT E2 E3 C3 4.7uF 100V 2220 3 15 SYNC 14 7 13 E7 2 D2 MMSD914T1 1 2 BOOST 1 2 D4 OPT 1 1 SOD123 SHDN E4 D3 OPT 2 + C7 D 3 1 8 4 6 BOOST VIN VIN SW 2 SW 5 SHDN SYNC C4 1.5uF 10V U1 LT3430EFE-1 D L1 68uH 1 SW NC NC GND R2 20.5k 1% FB FB 12 GND C5 D1 30BQ060 SMC BIAS 10 R4 OPT E5 VOUT 2 UP4B-680 1 VIN 5.5V - 60V E1 4 + 100uF 6.3V 6032 C10 + 100uF 6.3V 6032 C9 OPT VOUT 3.3V@2A C6 OPT 0805 2 5 C8 OPT E6 GND GND GND GND VC 16 17 11 R1 3.3k C R3 12.1k 1% VC C1 220pF C2 0.022uF R6 OPT 3 9 2 C 1 Q1 OPT R5 OPT NOTE: UNLESS OTHERWISE SPECIFIED B 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. FOR ALL OPTIONAL COMPONENTS ON BOARDS: Q1, R5, R6, C9: SHOW OUTLINE AND REFERENCE DESIGNATORS. D3, D4: NO OUTLINE, SHOW REFERENCE DESIGNATORS. C6, C7, C8, R4: NO OUTLINE, NO REFERENCE DESIGNATORS. B 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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS DRAWN: CHECKED: APPROVED: ENGINEER: KEITH S. DESIGNER: TECHNOLOGY KIM T. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC A 2A 100kHz HIGH VOLTAGE BUCK CONVERTER SIZE DWG NO. DATE: Thursday, February 08, 2007 A 2 DC1200A * LT3430EFE-1 SHEET 1 1 REV A OF 1