VIN 7.5V-60V E1 D3 MMSD914T1 2 1 VIN + C7 OPT E2 GND SHDN E3 SYNC 3 3 15 SYNC 14 4 1 BOOST SHDN SW SYNC SW U1 BIAS LT3430EFE NC NC GND 8 GND FB GND GND 9 D2 MMSD914T1 1 2 D4 SMAZ7V5 2 1 SOD123 OPT C4 0.68uF 16V 6 VIN VIN 7 13 C BOOST OPT C3 4.7uF 100V SHDN E4 2 2 1 D L1 33uH 1 SW E5 VOUT 2 UP3B-330 1 D 4 5 C9 OPT D1 30BQ060 SMC 10 R2 15.4k 1% 12 FB R4 OPT VOUT 5V@2A C6 OPT 0805 C5 2 5 + 100uF C 10V 7343 C8 OPT E6 GND VC 16 11 VC 3 C1 220pF C2 0.022uF R6 OPT 1 2 R1 3.3k R3 4.99k 1% Q1 MMBT2222A OPT R5 OPT B B NOTE: UNLESS OTHERWISE SPECIFIED A CONTRACT NO. 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. APPROVALS DRAWN: CHECKED: APPROVED: ENGINEER: KEITH S. DESIGNER: TECHNOLOGY KIM T. TITLE: SCHEMATIC 4 3 A 2A, 200KHz HIGH VOLTAGE BUCK CONVERTER SIZE DWG NO. A DATE: 5 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only Wednesday, July 10, 2002 2 REV DC471A-1 * LT3430EFE SHEET 1 1 A OF 1