5 D3 MMSD914T1 (Opt.) 2 1 E1 + C10 (Opt.) E2 3 4 6 Vin Vin BOOST 15 SHDN SW 2 14 SYNC SW 5 E4 C 7 NC 13 NC 1 Gnd 8 Gnd BIAS Gnd Vc 9 16 11 R4 (Opt.) Gnd C D1 30BQ060 SMC R6 (Opt.) 3 C1 220pF 1 2 C2 .015uF Q1 MMBT2222A (Opt.) NOTE: UNLESS OTHERWISE SPECIFIED R5 (Opt.) B LINEAR TECHNOLOGY CORPORATION For All Optional Components On Boards: Q1,R5,R6,C9 Show Ref. Des. And Outline D3,D4 Show Ref. Des. With No Outline C6,C7,C8,C10,R4 Show No Ref. Des. And No Outline 1630 McCARTHY BLVD. MILPITAS, CA 95035 PHONE (408) 432-1900 FAX (408) 434-0507 * High Vin Possible ( Up to 60V) With Thermal Constraints. See Quick Start Guide Title Size 4 3 A 3A, 500kHz High Voltage Buck Converter Document Number DC549A Date: Tuesday, September 03, 2002 5 E6 Vout 5V@2A C5 47uF 6.3V Cer C8 (Opt.) 12 R1 1.5K A C6 (Opt.) 0805 10 R3 4.99k 1% B E5 2 C9 (Opt.) R2 15.4k 1% Gnd D L1 10uH UP2B-100 1 U1 LT3431EFE FB 1 D4 SMAZ7V5 (Opt.) 2 1 C4 0.22uF 16V E3 SYNC D2 MMSD914T1 SOD123 1 2 C3 2.2uF 100V Gnd SHDN 2 1 Vin 7.5V-20V* 3 2 D 4 2 LT3431EFE Sheet 1 of 1 Rev 1