5 4 3 2 ECO VIN R13 0 VIN+ GND GND C39 1uF J6 + C2 220uF 4V L2 0.01 3.3uH RUN/SS2 15 SWB PG2 14 PG2 6 G2 VC2 13 VC2 SW2 Q2 Si7848DP JP2 C35 C36 [1] R37 0 4 SW2 3 1 20 21 19 FB1 SENSE1- 22 NC BIAS 5 3.3V 2 C37 1000pF 680pF R33 47K R34 51K 1% 3.3V RUN/SS RUN SHDN TP9 PG2 D2 PDS1040 1 2 B J5 R2 4 SHDN C 3 2 1 3.3V 16 7 C34 6.8uF 50V TP7 3.3VOUT 3.3V@4A VIN RUN/SS1 C33 1000pF 3 3.3VOUT R10 130K 1% 8 7 6 5 348K 1% G2 UVLO 3 5V RUN/SS RUN 2 3 22uH VIN PG1 C32 1 L3 VC1 17 GND VIN R30 18 VIN JP1 680pF 25 C4 2.2uF VC1 G1 2 R31 51K 1% C31 [1] LT3742EUF PG1 1 FB2 TP3 VIN SENSE2- G1 D1 PDS1040 SENSE1+ 4.7uH 12 1uF 0.01 11 J4 + C1 150uF 6.3V SW1 SENSE2+ C38 L1 10 J3 R1 U1 23 5V R35 0 4 24 C30 6.8uF 50V NC TP2 NC GND R32 47K Q1 Si7848DP 9 GND 5V TP8 SW1 VIN 1 2 C APPROVED PG1 TP5 5VOUT 5V@4A 06/08/06 [1] NC 5VOUT DATE PROTO R17 200 1% C11 R15 0 8 7 6 5 GND + CIN 47uF 35V J2 3 2 1 GND J1 3 5.5V - 28V DESCRIPTION 3 D 1.05K 1% 8 VIN+ REV R3 D TP4 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 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 Applications Engineering for assistance. B R16 0 TP6 C12 R14 0 [1] R4 619 A 1% R18 200 1% UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 NOTES: UNLESS OTHERWISE SPECIFIED, THIRD ANGLE PROJECTION [1] OPTIONAL. CONTRACT NO. APPROVALS DRAWN MEI DATE 05/12/05 CHECKED TECHNOLOGY TITLE A SCH, LT3742EUF, DUAL 2-PHASE STEP-DOWN SWITCHING CONTROLLER APPROVED 2. ALL RESISTORS AND CAPS SHALL BE 0402. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 ENGINEER SIZE DESIGNER CAGE CODE DWG NO REV 3 DC927A DO NOT SCALE DRAWING 5 4 3 Thursday, November 08, 2007 2 SCALE: NONE FILENAME: 927A-3.DSN SHEET 1 1 OF 1