BURST C D E CCM B DCM A JP1 1 2 3 4 MODE VIN 4 R1 200K SYNC/MODE R2 200K 4 R3 20.0K 1% JP2 3 2 1 C1 0.1uF 16V R8 200K R9 (Opt) PGOOD2 C5 (Opt.) VIN RUN2 7 VIN2 14 13 3 23 PGOOD1 25 26 24 FREQ TRACK/SS1 21 VFB1 20 ITH1 19 PHASE 18 RUN1 17 PGND2 16 PGND1 15 R18 0 VOUT1 C6 1000pF C8 10pF R20 200K VIN VIN 2 U1 LTC3546EUFD JP6 PHASE VOUT1 00 180 0 L1 1uH IHLP1616ABER-01 JP5 VOUT1 C19 (Opt.) C20 (Opt.) C18 (Opt.) C16 22uF 6.3V E11 E10 C14 22uF 6.3V E12 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY C GND 1630 McCARTHY BLVD. MILPITAS, CA. 95035 408-432-1900 www.linear.com 408-434-0507 FAX 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. B VOUT1 2.5V/2A LINEAR TECHNOLOGY CORPORATION Customer Notice 1 A E6 R17 316K 1% ON C17 (Opt.) L2 1uH IHLP1616ABER-01 C4 10pF R21 6.2K OFF VOUT2 C15 22uF 6.3V VCCA VIN1 SGND R25 49.9K 1% R28 0 R14 49.9K 1% 22 exposed pad solder side 12 JP4 C13 22uF 6.3V GNDA 27 SYNC/MODE 28 PGOOD2 VCCD 6 VOUT2 ON GND 5 11 C12 10uF 10V E8 E9 ITH2 8 OFF VOUT2 1.8V/2A 4 VIN1D + C11 22uF 6.3V VFB2 10 E7 E5 BMC1 PGND1D VIN 2 GND R19 200K TRACK/SS2 3 1 2 3 VIN 2.5V - 5.5V C10 0.1uF 16V 2 SW1D R23 2.2 BMC2 SW1 C9 10pF 1 SW2B R22 3.3K 9 C7 1000pF R12 49.9K 1% E3 R6 10.0K 1% PGOOD1 R11 (Opt.) GNDD R16 200K 1% R15 0 C2 0.1uF 16V R26 0 R7 (Opt.) R27 0 SW2A R24 49.9K 1% 29 3 VOUT2 R10 200K R13 143K 1% E4 C3 33pF TRACK1 1 2 3 R5 10.0K 1% R4 10.0K 1% TRACK/SS1 1 2 3 E2 TRACK1 JP3 VCCA TRACK/SS2 1 2 3 TRACK2 SS1 TRACK2 SS2 E1 1 LTC3546EUFD Title Dual Synchronous, Configurable, High Switching Frequency Buck Regulator D Size Document Number Date: Monday, January 12, 2009 Rev Demo Circuit 1086A Sheet 1 E A of 1