A C D E R3 0 1 4 1 3 R4 100K 4 ON OFF DCM CCM BURST 400KHz 550KHz 250KHz 4 C1 0.1uF JP4 VOUT 1 PLLIN/MODE 2 1 2 R2 (Opt.) JP3 MODE 3 R1 0 3 3 E2 JP2 PLLPF 2 TRACK JP1 TRACK/SS TRACK SS 4 2 NOTES: B UNLESS OTHERWISE SPECIFIED E1 R5 10K R7 9.53K C4 1200pF U1 LTC3835EGN-1 1 Plllpf Pllin/Mode 16 2 Ith Sense+ 15 3 Track/SS Sense- 14 4 VFB RUN 13 C5 150pF 3 R10 68.1K 1% R11 215K 1% C9 39pF SGND Boost 12 SGND 6 PGND TG 11 E5 7 BG SW 10 VIN 9 C6 1000pF VIN 4.5V-36V * R12 0 Q1 Si4840DY 4 C10 0.1uF 1 D2 CMDSH-4E 2 C14 + 4.7uF 16V TAJ R15 0 2 C8 + 22uF 50V Elec. E3 3 GND D1 (Opt.) 4 VOUT R13 .012 0.5W R14 (Opt.) 0805 3.3V@5A C11 + 150uF 10V TPD C13 (Opt.) C17 4.7uF 10V X5R E6 GND 2 C12 0.1uF 50V 1 2 3 IntVcc C16 3.3uF 50V X7R L1 3.2uH CDEP105-3R2MC 1 8 C7 3.3uF 50V X7R E4 5 6 7 8 5 R6 0 R8 0 R9 0 5 6 7 8 C3 100pF 1 2 3 C2 1000pF E7 Q2 Si4840DY 2 C15 1uF AGND DGND LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Customer Notice 1 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. * Vin Can Drop As Low As 4V Without Affecting Output Voltage A B C D LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 408-432-1900 408-434-0507 FAX Title 1 Single 5A High Frequency Step-Down DC/DC Converter Size Document Number Date: Thursday, June 15, 2006 Demo Circuit 965A LTC3835EGN-1 1 Sheet E of 1 Rev A