1 2 3 4 5 6 7 8 REVISION HISTORY ECO REV DESCRIPTION PROTO 4 C1 1000pF R2 75 R4 75 DATE APPROVED 01/06/03 E1 A PGOOD A C40 C8 R9 VIN+ SHT 2 0.01uF 10 6 S 0.01uF 100pF S S 7 0.01uF 8 ITH1 9 E7 S 10 11 ITH2 E8 12 C18 R16 10K R17 10K 0.1uF 13 C30 S C27 C29 3 3.3V 2 2.5V 1 JP4 R18 15k R19 30.1k 14 PLLFLTR VIN PLLIN BG1 FCB EXTVCC ITH1 INTVCC SGND PGND 3.3VOUT ITH2 BG2 BOOST2 VOSENSE2 SW2 TG2 SENSE2SENSE2+ 100pF RUN/SS2 1 J4 23 Q3 Si7860DP 4 22 C17 4.7uF 21 20 Q4 Si7860DP 4 + C16 15uF 10V 3216 D4 B340B R13 0.003 S1 + C13 150uF 6.3V + C14 150uF 6.3V + C15 150uF 6.3V J3 R34 C19 0 0.47uF 18 Q6 Si7888DP 4 16 R28 optional Q7 Si7888DP 4 R14 0.003 L21.4uH SW2 Q8 Si7860DP Q9 Si7860DP 4 VO2+ R15 optional D5 B340B + C22 150uF 6.3V + C23 150uF 6.3V + C24 150uF 6.3V R20 0 C36 10uF 10V 1210 J6 BG2 R22 75 S S2 R23 4.75k SHT 2 VO2+ S J5 15 S C31 470pF OPT VO1- 5V/3.3V 0A to 12A 470pF S B C35 10uF 10V 1210 TG2 19 17 VO1+ 5 6 7 8 24 1 2 3 C25 S VIN+ VO1+ R12 optional C20 0.1uF 1000pF 2 1 2 3 1 2 3 BG1 R33 0 25 4 1000pF C62 2. 2uFJ2 VINL11.4uH 2 E6 SW1 BOOST1 C59 2. 2uF 1 C39 VOSENSE1 C11 SW1 C12 0.47uF 1 2 3 5 C38 C28 SENSE1- 27 26 C10 2.2uF 2. 2uF 5 6 7 8 4 28 1 2 3 S PLLFLTR E5 TG1 5 6 7 8 3 PGOOD SENSE1+ 5 6 7 8 0.1uF LTC3728EG RUN/SS1 1 2 3 2 5 6 7 8 U1 1 C26 C44 2. 2uF Q2 Si7888DP 4 1 2 3 E4 B Q1 Si7888DP 4 RUN1 5 6 7 8 5 6 7 8 S 5 6 7 8 S J1 8V to 24V 2 1 2 + C61 56uF 25V TG1 S R10 3.01K 2 R24 0 2 0.22uF D3 BAT54A 1 2 3 R1 INTVcc 3 1M JP6 0 1 1 0 3 1 C6 0.22uF 1 JP1 3 E3 C5 2 FCB C4 0.1uF + 1 C3 1.0uF 35V CASE B 2 PLLIN 3.3VOUT + C60 56uF 25V VIN+ 1 R8 2 10K 1% 1 0.01uF 2 S 1 S E2 3.3V/2.5V 0A to 12A C32 1000pF VO2- R31 optional R25 75 C C S SENSE2+ E12 R26 10 R29 R27 4.75k C42 36.5k JP5 2 SENSE1+ 3 5.V 3.3V 1 S 0.1uF C34 C33 470pF R30 24.9k S 470pF OPT E13 S R32 10 C41 0.1uF E14 S RUN2 JP7 1 EXTVCC E15 S 0 R3 2 3 1 1M EXTVCC R21 100K SHT 2 D C21 1uF INTVCC UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 SHT 2 E18 INTVCC E9 SGND THIRD ANGLE PROJECTION E10 CONTRACTNO. APPROVALS DRAWN MEI DATE 06-10-02 CHECKED TECHNOLOGY TITLE D SCH, LTC3728EG, DUAL 2-PHASE SYNCHRONOUS STEPDOWN REGULATOR APPROVED SGND 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 ENGINEER E11 SIZE CAGE CODE DESIGNER SGND DWG NO REV 4 DC542A Custom S DO NOT SCALE DRAWING 1 2 3 4 5 Monday, January 06, 2003 6 SCALE:NONE FILENAME: 542A-4.DSN 7 SHEET 1 8 OF 2 REVISIONHISTORY ECO REV DESCRIPTION 4 DATE PROT O 01/06/03 APPROVED . OPTIONAL BIAS CIRCUIT L3 4.7uH OPT D7 SHT 1 INTVCC 1 2 MURATA LQH32CN4R7 M01L B0520LW OPT SHT 1 1 EXTVCC 2 1 C7 10uF 10V 1210 OPT C2 470pF OPT R36 37.4K OPT OPT SWVIN B0520LW SD OPT 2 VO1+SHT 1 JP83 U3 D6 GNDFB VO1+ 2 5 VIN+ 4 R11 VIN+SHT 1 OPT 3 LT1613CS5 1 10K OPT C43 4.7uF 10V 1206 OPT IF VIN < 5V R35 11.0K 1% OPT NOTE: Iout (max)=200mA For input voltage of 3.3V VO1+ + C45 + C46 optional + C47 optional + C48 optional + C49 optional + C50 optional optional + C51 optional VO2+ + C52 + C53 optional 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 + C54 optional + C55 optional + C56 optional CONTRACTNO. APPROVALS DRAWN M E I CHECKED DATE 06-07-02 + C57 optional TECHNOLOGY optional + C58 optional 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TITLE SCH, LTC3728EG, DUAL 2-PHASE SYNCHRONOUS STEP- APPROVED DOWN REGULATOR ENGINEER DESIGNER SIZE CAGECODE A DO NOT SCALE DRAWING Monday, January 06, 2003 SCALE:NONE DWGNO REV 4 DC542A FILENAME: 542A-4.DSN SHEET 2 OF 2