A B C D E Vin VIN C1 10uF 10V C2 10uF 10V 3 4 JP1 Mode Pulse Skipping C7 1uF 10V R1 10 C3 22uF 10V R2 100K C4 22uF 10V (Opt.) 2.75V - 8V C5 10uF 10V C6 10uF 10V Gnd 2 1 2 3 E12 1 3 2 1 Continuous Q2 Si9433BDY Q3 Si4346DY SENSE2+ 11 5 6 7 8 SENSE1+ 12 4 21 PGND2 3 R3 118K 1% E4 SYNC/FCB E6 SW1 19 BG1 RUN/SS 15 SW2 10 BG2 13 PGND 16 Q6 FDC638P L2 0.68uH IHLP-2525CZ-01-0.68uH C11 47uF 6.3V C12 47uF 6.3V C13 10uF 6.3V E3 SYNC/FCB 14 RUN/SS PGOOD 9 6 TRACK PLLLPF 3 23 IPRG1 IPRG2 2 24 VFB1 VFB2 7 PGOOD ITH2 8 E7 ITH1 3 1.8V @ 6A 18 U1 LTC3736EUF-2 C14 (Opt.) TG2 1 2 5 6 22 1 E8 Vout2 1 2 3 Gnd TG1 bottom exposed pad C10 47uF 6.3V 17 SGND C9 47uF 6.3V Q5 FDC638P Gnd E5 PLLLPF 4 6 5 2 1 2.5V @ 6A C8 10uF 6.3V Q4 Si4346DY 4 3 2 1 L1 0.68uH IHLP-2525CZ-01-0.68uH E2 2 PGND1 3 Vout1 3 4 20 4 8 7 6 5 5 6 7 8 PGND 25 4 8 7 6 5 VIN 5 4 Q1 Si9433BDY 4 E1 C15 0.01uF E9 IPRG1 2 IPRG2 E10 R5 187K 1% R4 10K VIN C20 120pF SGnd C16 1200pF C22 ( Opt. ) R8 59K 1% R9 59K 1% C17 (Opt.) C18 (Opt.) R10 5.1K R6 118K 1% C19 1500pF R11 10K R12 59K 1% R13 10K E11 VIN R7 10K C21 ( Opt. ) E13 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Customer Notice 1 NOTES: 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. UNLESS OTHERWISE SPECIFIED A B C D LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 408-432-1900 408-434-0507 FAX Title 1 2-Phase Dual Synchronous Step-Down Converter with Output Tracking Size Document Number Date: Thursday, September 22, 2005 Demo Circuit 922A LTC3736EUF-2 1 Sheet E of 1 Rev