A B C D E L3 470uH VSW 3 2 R49 (Opt.) R95 0 R24 R23 16.2 1/4W C66 5.6nF 100V Q2 1 2 Q8 Q11Q39 Si7852DP 2 C1 3.3nF 100V 1206 Q14 HAT2169H Q15 (Opt.) C20 1.5nF 200V -VOUTP1 R83 (Opt.) C70 2.2nF 11 -VOUTS SG C82 75pF R94 147 Q37 MMBT2907A A 1 VSB IS+ 3 MODE 11 10 IS- SLP 4 R9 100 C75 68pF 2 R46 619 R68 6.81K C79 2.2nF C76 (Opt.) -VOUTS C77 22uF 1210 -VOUTP -VOUTS LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY LINEAR TECHNOLOGY CORPORATION 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 -VOUTS B C10 1.0nF 2 1 1% R69 0 Customer Notice R92 R41 4.53K Q36 MBT3946DW1T1 5 C8 470pF D6 4.3V MMSZ4687T1 C9 0.22uF 6 4 R93 147 1% FB/PH -VOUTS 2 2 Q34 2N7002 2 2 1 VCC 3 R89 604 1 R91 10.0K R66 100K +VOUT SS R90 7.50K R7 47K VCC 1 Q27C 1 3 D3 12V MMSZ5242BS -VOUTS -VOUTP -VOUTP 3 2 RUN/SS C78 4.7nF C30 2.2nF 250V D29 PT1N4148WS 2 1 1 C81 10pF 12 SS C88 VSW PGND R63 90.9K VIN 3 Q27 FCX491A SG 7 U2 LTC3726EGN C7 100pF 47pF D2 1N4148WS FG PT- 13 14 GND 5 R61 100 R87 0 R86 261K PT+ PT- 6 8 SW 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 E4 1 R56 100 FS/SYNC 3 Rb 162K 220uF 6.3V VSB 9 10K R84 0 C80 + C83 3 C27 2.2nF 2 Ra 10K R76 470 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 C31 C33 100uF 6.3V 1210 C69 2.2nF 200V 1206 R50 0.002 1W VA Q3 Q12 Q38 Si7852DP 16 3 7 C89 0.22uF VIN 3 4 E3 2.4uH PA1494.242 R1 R2 R51 R52 31.6 8 Q1 FMMT619 1 R3 100 R79 1.0K 2 9 VCp 4 +Vout 5V/20A 1 2.2K D7 BAS21 R11 R12 1.0 10 R13 (Opt.) 1206 1 1 R97 +VOUT L2 1 5 VCC E2 2 1 11 T3 PA1005.100 3 3 1 C3 C4 C5 6.8uF 50V 1812 C2 6.8uF 50V 1812 3 SG E1 R4 (Opt.) 25V 1 2 7 4 6 5 8 VA ITH -Vin VIN C67 4.7uF D1 BAS21 5 4 +Vin 9V - 36V D25 BAS21 T1 PA0901.005 6 1 L1 0.47uH 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-A Date: Friday, June 05, 2009 Sheet E 1 of 3 1