B C 8 7 6 5 3 2 1 Q3A FDS6898A 1 R1 1 GND OUT 6 5 3 C1 + 100uF 20V (Opt.) E4 2 1 E6 C2 10uF 25V 10 1 Vdd C5 1uF 25V D1 LED GREEN 1 D3 B0530W 4 1 Status 9 E7 Fault UV OV 8 E8 Gnd U1 LT4351CMS 8 7 6 5 3 2 1 8 7 6 5 3 2 1 Q6A FDS6898A CB3 10uF 25V 1 R7 1 GND Q6B FDS6898A 6 5 3 2 E10 8 7 E12 1 10 1 2 Vdd D6 LED GREEN 1 R12 1.96K 1% 12V 2 E11 D7 LED RED R10 10K 9 NOTES: E15 FAULT2 Fault UV OV U2 LT4351CMS 8 E16 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Customer Notice 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. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. Gnd 7 B IN3 E9 STATUS2 Status 6 A R9 10K SW D9 B0530W RA2 1.96K 1% CB2 10uF 25V GND VCC2 5 RB2 95.3K 1% 1 1 2 2 4 R11 60.4K 1% 20V Max E13 C9 1uF 25V D8 B0530W D5 SBG1025L 3 R8 0 C6 10uF 25V Out Vin 2 E14 Gate VDD2 C8 0.1uF 25V 3 C7 10uF 25V L2 10uH DO1608C-103 4 4 IN2 2 20V Max 4 Q5 Si4408DY (Opt.) 4 Q4 Si4408DY (Opt.) 1 7 RA1 1.96K 1% 12V 3 FAULT1 6 2 R4 10K STATUS1 D4 B0530W R6 1.96K 1% D2 LED RED 5 RB1 95.3K 1% R3 10K SW E5 2 3 2 R5 60.4K 1% E3 VCC1 2 Out Gate VDD1 Vin L1 10uH DO1608C-103 C4 0.1uF 25V 3 C3 10uF 25V 4 E1 GND R2 0 2 CB1 10uF 25V Q3B FDS6898A 2 E2 8 7 4 IN1 12V 4 Q2 Si4408DY (Opt.) 4 20V Max E 8 7 6 5 3 2 1 Q1 Si4408DY (Opt.) 4 D 1 A C D UNLESS OTHERWISE SPECIFIED LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 www.linear.com 408-432-1900 408-434-0507 FAX Title Size Date: LT4351CMS ORed Power Supply Document Number Demo Circuit 694A Friday, April 10, 2009 Rev LT4351CMS Sheet E 1 of A 1 1