5 4 3 2 1 REVISION HISTORY This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice: Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customers 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 Applications Engineering for assistance. ECO REV DESCRIPTION DATE PROD 3 APPROVED 02/28/06 D D VIN L1 0.20uH VISHAY IHLP-2525CZ-01 .20 VIN SVIN SVIN C2 1uF R5 OPT 470pF RITH 5 CIN1 22uF 6.3V JP7 CLKIN 2 PHASE 4 PHASE VOUT 3 PHASE 1 4 3 6 TRACK 33 R1 VOUT 30.1K 1% 32 ITH 34 SVIN ITHM 35 PVIN 36 PVIN PVIN 28 5 PVIN PVIN 27 6 SW SW 26 7 SW SW 25 8 SW SW 24 9 SW SW 23 PGOOD 22 MODE 11 CLKIN BSEL 21 12 PHMODE MGN 20 PHMODE 2 37 4 10 TP9 SVIN 29 13 B VIN FB PGND 3 6 39pF R6 OPT 47pF CFF 22pF JP1 1.2V VIN CIN3 22uF 6.3V TP8 C CC 100pF OPT RTR 100K 1% JP2 1.5V RFB1 29.4K 1% JP3 1.8V JP4 RFB2 20K 1% RFB3 15K 1% RFB4 OPT USER SELECT RPG 100K 1% TP10 PGOOD SVIN BSEL 1 10% 4 3 VOUT 15% 5% 5 1 2 3 4 B MGN+ VOUT NO MGN MGN- 6 5 JP8 5 SVIN MGN 2 6 19 FORCED CONTINUOUS 4 C4 PLLPF PGND PULSE SKIP VOUT MODE 1 5.10K 30 3 PGND 2 BURST 100pF TRACK 18 C3 SVIN N/C SGND PGND SW N/C 2 17 R3 16 5 JP6 31 PGND 6 C1 SVIN 1 15 -30% U1 LTC3415EUHF PVIN 38 3 CLKOUT 1 4 PGND 2 PGND +30% FREE RUN RUN PLLPF GND 10K 1% TP5 SVIN COUT4 OPT TP7 2 VIN 14 CLKOUT COUT3 OPT VOUT 1.2V/1.5V/1.8V @ 7A CITH 6.3V C COUT2 100uF 6.3V 1 CIN2 22uF RSD 1M 1% TP6 COUT1 100uF 6.3V SVIN 2 1 OFF R4 0 2 ON TP2 VOUT ENABLE JP5 VOUT SW 1 CINA * 68uF 10V GND + R2 10 2 CIN6 OPT 1 CIN5 100uF 6.3V 2 CIN4 100uF 6.3V 1 TP1 3 2.5V to 5.5V JP10 TP12 SGND JP9 TP13 GND * CINA IS AN OPTIONAL CAPACITOR. IT IS INSERTED ON THE DC725A A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO THE USE OF LONG INPUT LEADS. ON A NORMAL TYPICAL PCB WITH SHORT TRACES. CINA IS NOT NEEDED. UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 THIRD ANGLE PROJECTION CONTRACT NO. APPROVALS DRAWN MEI DATE 12/01/04 CHECKED TECHNOLOGY TITLE APPROVED ENGINEER DESIGNER SIZE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A SCH, LTC3415EUHF, 7A MONOLITHIC SYNCHRONOUS BUCK CONVERTER CAGE CODE DWG NO REV 3 DC725A DO NOT SCALE DRAWING 5 4 3 Thursday, March 30, 2006 SCALE: NONE 2 FILENAME: 725A-3.DSN SHEET 1 1 OF 1