A B C D E L3 (Opt.) VSW 0 Q2 1 R23 R24 (Opt.) 1/4W C66 3.3nF 100V Q39 (Opt.) C1 390pF 200V 1206 C20 (Opt.) 200V -VOUTP1 R83 (Opt.) C70 3.9nF VCC C78 4.7nF C30 2.2nF 250V -VOUTS -VOUTP -VOUTP R66 100K 3 +VOUT MODE IS+ SLP RUN/SS SS 16 11 10 IS- 12 PGND R63 90.9K VIN 3 Q27 FCX491A SG 7 U2 LTC3726EGN C7 100pF SW FG PT- 13 14 GND 5 R61 100 11 R86 261K PT+ PT- 6 8 R87 0 C88 2 10 7 IS GATE 15 6 4 5 FS/IN- 6 9 3 C73 470pF -VOUTP C71 1uF 8 SSFLT C6 100pF 4 GND 2 C29 33nF PGND ULVO VSLMT 1 C24 4.7uF C55 1nF 1 T2 PA0297 C72 0.1uF FB/IN+ VCC 5.1K 1 2 2 3 8 D4 4.7V MMSZ5230BS R22 28.7K NDRV VCp R18 147K R58 U1 LTC3725EMSE -Vout 1 R56 100 FS/SYNC 3 Rb 162K E4 VSB FB/PH 9 10K R84 0 47uF 20V 3 C27 2.2nF 2 Ra 10K R76 680 1206 R85 (Opt.) 2 R6 1 R55 100 1% 1 R98 22 CUT Q28 FMMT38C R54 100 1% 1 Q6 MMBFJ201 3 3 D28 MMSZ5236BS 7.5V VCC Q26 FMMT619 Q27C 2 3 Q32 FMMT718 3 2 3 FMMT718 C80 + C83 C69 330pF 200V 1206 R50 0.006 1W VA C31 C33 22uF 16V 1210 2 2 2 3 Q8 Q11 Si7370DP R95 Q3 Q12 Q38 Si7450DP Q14 Q15 Si7456DP 2 E3 16uH PULSE, PA2050.163NL R1 R2 R51 R52 196 1 1 (Opt.) VIN 3 4 7 C89 0.22uF R49 R3 100 1.0 R79 3.3K 8 Q1 FMMT619 1 3 R11 R12 9 VCp 4 +Vout 15V/6.4A 2 2.2K D7 BAS21 +VOUT L2 1 5 10 R13 0 1206 1 R97 1 VCC E2 2 3 11 T3 PA1005.100 3 3 1 C3 C4 C5 6.8uF 50V 1812 C2 6.8uF 50V 1812 1 SG E1 R4 22 25V 6 7 4 6 5 8 VA R41 14.7K C10 (Opt.) 4 R9 (Opt.) ITH -Vin VIN C67 4.7uF D1 (Opt.) 5 4 +Vin 9V - 36V D25 (Opt.) T1 PA0912 1 L1 0.47uH R69 113K C75 68pF 2 R46 619 R68 12.1K C79 6.8nF C76 (Opt.) -VOUTS C77 22uF 1210 -VOUTP -VOUTS 47pF D29 PT1N4148WS Q27C SS R90 7.50K R93 147 1% -VOUTS SG C82 82pF R94 147 1 2 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY LINEAR TECHNOLOGY CORPORATION Customer Notice R92 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. 47K 1 1% Q37 MMBT2907A A 5 C8 470pF D6 4.3V MMSZ4687T1 C9 0.22uF Q36 MBT3946DW1T1 -VOUTS 2 2 Q34 2N7002 2 2 VCC R91 10.0K 3 R89 732 1 1 R7 47K VSB -VOUTS 3 D3 22V MMSZ5251BS 4 1 3 2 6 C81 10pF 2 1 1 VSW 1 D2 1N4148WS B C D 1630 McCARTHY BLVD. MILPITAS, CA. 95035 408-432-1900 408-434-0507 FAX Title LTC3725EMSE, LTC3726EGN 9V-36Vin Forward Converter Size Document Number Rev Demo Circuit 1300A-C Date: Friday, June 05, 2009 Sheet E 3 of 3 1