5 4 3 2 1 D D VIN GND SHDN OPT E2 E3 SYNC E4 BOOST OPT C3 2.2uF 100V 1812 3 SOD123 4 6 NC VIN BOOST SHDN 15 SYNC SHDN SW 2 14 SYNC NC 5 7 13 C 1 8 U1 LT1766EFE NC NC GND GND BIAS FB GND GND 9 16 L1 47uH 1 SW 12 R2 15.4k 1% FB 11 + C5 100uF 10V 7343 C9 OPT VOUT 5V@1A C6 0.47uF, 25V OPT 0805 C C8 OPT E6 GND R6 OPT 3 C1 220pF 1 Q1 MMBT2222A OPT R5 OPT B CONTRACT NO. NOTE: UNLESS OTHERWISE SPECIFIED APPROVALS 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. ALL OPTIONAL COMPONENTS WILL HAVE NO COMPONENT OUTLINE ON BOARD EXCEP Q1, R5, R6, AND C9. DRAWN: CHECKED: APPROVED: ENGINEER: KEITH S. DESIGNER: TECHNOLOGY KIM T. 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC A 1.5A, 200kHz HIGH VOLTAGE BUCK CONVERTER SIZE DWG NO. A DATE: 4 SUMIDA CDRH104R-470 R3 4.99k 1% 2 C2 0.022uF 5 E5 VC R1 3.3k A R4 OPT VOUT 2 D1 10MQ060N SMA 10 VC B OPT C4 0.33uF 16V 1 + C7 D4 CMHZ5236B 2 1 D2 1N4148W 1 2 2 E1 VIN 6V -60V D3 1N4148W 2 1 DC326C-1 * LT1766EFE Thursday, April 24, 2003 2 REV SHEET 1 1 C OF 1