A RUNA ON B RUNA 1 C D E REVISION HISTORY VIN R6 ECO OPT C1 R7 OPT VIN CGND VSWH GL PGND VSWH VSWH U3 FDMF6707B PGND VSWH PGND VSWH 21 19 17 36 VIN- E2 35 34 33 L1 0.47uH 744355147 WURTH EL. 32 VSWH VSWH VSWH 31 COUT8 100uF 6.3V 1206 R15 2.87K 1% COUT7 100uF 6.3V 1206 R19 10 VOSA+ VOSA+ 3 VOUTA 1.5V / 50A J3 COUT6 330uF 2.5V + COUT5 330uF 2.5V + COUT4 330uF 2.5V + COUT3 330uF 2.5V + COUT2 330uF 2.5V + COUT1 330uF 2.5V VCCA R33 2.87K 1% 16 5VBIAS C10 R23 OPT 1 R107 R20 0 C11 2.2uF 16V VIN C32 2.2uF 16V R24 TP2 10K U4 FDMF6707B PGND VSWH COUT9 100uF 6.3V 1206 VOSAR21 10 PGND VSWH E8 DISBL#2 THDN2 39 38 37 36 35 34 33 32 31 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 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. APPROVALS PCB DES. APP ENG. TECHNOLOGY AK MIKE S. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER SIZE C 2 GND 43 29 30 PHASES 1 AND 2 B E6 R27 OPT 1 CAPACITORS AND RESISTORS ARE 0603 UNLESS OTHERWISE SPECIFIED. VOSA- VSWH VSWH VSWH VSWH PGND PGND 28 R26 10K COUT10 100uF 6.3V 1206 GND 1 SMOD# VCIN 2 3 VDRV 4 BOOT CGND GND VSWH PGND R35 OPT 5 41 PGND 21 E9 6 VSWH PGND 19 PGND 27 18 GL PGND 17 VSWH 26 16 CGND PGND 15 THWN VIN PGND CLKOUTA CIN5 22uF 16V 1210 VIN PGND CIN6 OPT 1210 FSWITCH = 500kHz TYPICAL DISB# 25 14 PWM VIN 24 13 40 VIN 23 12 GH PHASE 7 10 9 42 8 VIN VIN VIN NC R30 40.2K J4 L2 0.47uH 744355147 WURTH EL. 0.22uF R28 OPT VCCA A GND 37 + R29 OPT R34 OPT J1 J2 C9 0.22uF 18 20 GND CIN1 180uF 16V VOA+ PGND R32 OPT + 20 22 E7 CIN2 OPT 38 C8 0.22uF 22 R31 10k CLKINA + 23 11 CLKINA CIN11 OPT 1210 24 PWMEN2 C12 OPT 4 VIN 6V - 14V 39 2 VCCA CIN12 OPT 1210 THDN1 40 43 29 30 PGND 28 PGND 27 26 PGND VSWH PGND PGND R25 0 VCCA VIN+ E1 1 SMOD# VCIN VDRV 2 3 4 5 41 BOOT 6 CGND GND 7 THWN PGND 25 26 R16 0 ILIMA PWM VIN PGND R4 10K PWM2 RUN2 PWMEN2 FB2 R117 OPT VOSA- 20 PWM1 28 27 PGOOD1 IAVG 30 ILIM2 33 R116 0 SGND ISNS2P COMP2 GND R110 OPT ISNS2N VSNSP 15 8 VOSA+ VSNSN PGOOD2 7 09-28-11 E5 ISNS1N 14 6 PHSMD C1-A 470pF VSNSOUT 13 5 DATE MIKE S R5 OPT DISBL#1 DISB# R18 59.0k ISNS1P U1 LTC3860EUH CLKOUT 68pF VDIFA PWMEN1 ILIM1 12 C2-A 4 19 RUN1 CLKIN R2-A 6.8k 17 100pF FB1 COMP1 16 18 VCC 11 3 SGND 32 2 FREQ COMPA TRK/SS2 1 10 RB-A 13.3K 1% TRK/SS1 FBA R3-A 523 9 R1-A 20K 1% VINSNS C3-A 2200pF 31 C7 1uF 29 C6 OPT 15 C4 PWMEN1 VCCA R17 1 14 CIN3 22uF 16V 1210 CIN4 OPT 1210 IAVGA R11 0 APPROVED VIN C31 2.2uF 16V TP1 VIN 24 R13 OPT R3 10K VIN 23 13 VIN 5VBIAS 12 21 R14 OPT R112 0 3 C5 OPT PGND R9 OPT TRACK/SSA VDIFA 11 22 R10 OPT R12 0 PHASE VIN VIN VIN NC TRACK/SSA 10 9 42 8 VCCA PGND VOB+ E4 PRODUCTION R2 C2 2.2uF 16V VIN PGOODA E3 DESCRIPTION 2 0.22uF R8 100K 4 5VBIAS 1 R1 0 PGND VCCA GH C3 OPT JP1 25 3 OFF REV __ 2 N/A SCALE = NONE DATE: IC NO. REV. LTC3860EUH 2 DEMO CIRCUIT 1755A Monday, January 16, 2012 SHEET 1 E OF 3 1 A B RUNB VIN RUNB 1 ON E 5VBIAS C13 R41 OPT R36 0 1 R37 PGND PGND C22 R55 2 3 4 1 SMOD# VCIN VSWH VSWH VSWH VOSB+ R53 10 E26 43 29 30 PGND 28 R49 2.87K 1% 5VBIAS 1 R57 0 COUT16 330uF 2.5V + COUT15 330uF 2.5V + COUT14 330uF 2.5V + COUT13 330uF 2.5V + COUT12 330uF 2.5V + VOSB+ VOUTB 1.2V / 50A 3 COUT11 330uF 2.5V R56 10 R70 2.87K 1% GND VCIN 1 SMOD# 2 3 VDRV BOOT 4 5 41 CGND VSWH GL PGND VSWH PGND VSWH U6 FDMF6707B PGND VSWH COUT19 100uF 6.3V 1206 COUT20 100uF 6.3V 1206 40 DISBL#4 THDN4 39 38 37 36 35 34 33 32 31 43 29 30 PGND 28 27 21 R64 OPT VSWH VSWH VSWH VSWH PGND PGND PGND VSWH PGND PGND PGND 20 THWN VIN 26 19 VIN 25 17 PWM DISB# PGND 16 R63 10K 0.47uH 744355147 WURTH EL. 2 VIN 24 15 CGND GND PHASE VIN VIN VIN NC CIN9 22uF 16V 1210 18 FSWITCH = 500kHz TYPICAL 7 10 9 42 8 R67 40.2K 14 CIN10 OPT 1210 E27 L4 C34 2.2uF 16V R61 10K TP4 VIN PGND R65 OPT R66 OPT 6 VIN VOSBVOSB- C23 2.2uF 16V 12 CLKOUTB E14 VCCB 1 GND COUT17 100uF 6.3V 1206 0.22uF R68 OPT CLKOUTB COUT18 100uF 6.3V 1206 31 J12 PWM2 RUN2 PWMEN4 R69 0 32 17 13 CLKOUTA 0.47uH 744355147 WURST EL. C21 0.22uF 18 11 C24 OPT 27 21 19 R62 0 VCCB L3 33 20 R60 OPT VCCB 34 21 R58 OPT R59 0 35 + R54 0 R119 OPT 36 C20 0.22uF 22 22 VOSB- 37 J11 VCCB 2 38 VOB+ RUNB R118 0 VDRV VSWH PGND PGND 16 15 PGOOD2 14 PHSMD 13 PWMEN2 ILIM2 CLKOUT VSWH 23 26 27 28 29 30 COMP2 FB2 BOOT PGND THDN3 39 25 PWM1 PWMEN1 PGOOD1 IAVG SGND ISNS2P 33 R111 VOSB+ OPT 31 VSNSP GND 8 ISNS2N 12 7 VSWH DISBL#3 4 23 ISNS1N VSNSN CLKIN 6 C1-B 470pF VSWH U5 FDMF6707B R40 OPT 24 ISNS1P U2 LTC3860EUH VSNSOUT 11 68pF SGND 32 5 ILIM1 FREQ 4 VDIFB C2-B RUN1 COMP1 5 41 VSWH 40 R39 10K R52 59.0k FB1 TRK/SS2 3 R2-B 6.8k 6 PGND PWMEN3 VCC 10 2 9 1 COMPB VINSNS TRK/SS1 FBB R3-B 523 CGND GND GL ILIMB C3-B 2200pF RB-B 20.0K 1% 7 VSWH PGND R50 0 CGND PGND C18 OPT 20 THWN VIN PGND 19 VIN 26 17 18 100pF C19 1uF 16 C16 R51 1 R113 0 15 DISB# 25 IAVGB R45 0 VCCB CIN8 OPT 1210 R47 OPT PWM VIN PGND 14 VIN VDIFB 13 CIN7 22uF 16V 1210 C33 2.2uF 16V R38 10K TP3 VIN PGND C17 OPT 5VBIAS 12 24 E11 R48 OPT 11 R44 OPT 23 VCCB PGND TRACK/SSB R46 0 TRACK/SSB PHASE VIN VIN VIN NC E10 22 PGOODB 10 9 42 8 R43 100K 4 C14 2.2uF 16V VIN GH R42 OPT VCCB GH C15 OPT 0.22uF PGND 3 JP2 R1-B 20K 1% D 2 OFF 3 C PHASES 3 AND 4 R71 OPT 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 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R72 OPT E16 APPROVALS PCB DES. APP ENG. TECHNOLOGY AK MIKE S. TITLE: SCHEMATIC DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B C D 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only N/A SCALE = NONE DATE: IC NO. REV. LTC3860EUH 2 DEMO CIRCUIT 1755A Monday, January 16, 2012 SHEET 2 E OF 3 1 A B VOA+ E21 R76 10k LOAD STEP 10mV / Amp GND E22 2 3 PWMEN1 ISTEPB+ E20 R82 OPT 1% 2010 R81 0.010 1% 2010 ISTEPA- E23 Q3 SUD50N03-09P OPT 1 E18 ISTEPA+ E19 R80 OPT 1% 2010 2 1 PULSE GEN B R79 0.010 1% 2010 J8 3 2 2 R75 10k GND Q4 SUD50N03-09P 1 E17 PWM ENABLE CIRCUIT FOR NON-THREE STATE COMPATIBLE DRMOS VOUTB 5% DUTY CYLCE MAX. Q2 SUD50N03-09P OPT 3 PULSE GEN A VOUTA J7 3 4 E VOB+ 5% DUTY CYLCE MAX. 1 D DYNAMIC LOAD CIRCUIT FOR VOUTB DYNAMIC LOAD CIRCUIT FOR VOUTA Q1 SUD50N03-09P C ISTEPB- OPT OPT VOA+ PWMEN2 DISBL#2 + COUT21 7343H OPT + COUT22 7343H OPT + COUT23 7343H OPT + COUT24 7343H OPT + COUT25 7343H OPT + COUT29 OPT 1206 COUT28 OPT 1206 COUT27 OPT 1206 COUT26 7343H OPT COUT30 OPT 1206 + VOA+ 3 + COUT32 7343H OPT + COUT33 7343H OPT + COUT34 7343H OPT + COUT35 7343H OPT COUT42 OPT 1206 COUT43 OPT 1206 COUT44 OPT 1206 COUT46 OPT 1206 COUT45 OPT 1206 R115 OPT R90 0 1206 C26 10uF 2 ON 2 OFF 3 27uH WURTH EL.7447789127 U7 LT3502EDC 1uF 1 JP3 C30 10pF R97 105K 2 3 R105 20K 4 VIN SW BD FB COMPA BOOST EXPOSED PAD SHDN DA GND TRACK/SSA D1 BAV170 SOT23 5VBIAS 3 C28 1 RIGHT ANGLE HEADER IAVGA RUNA RUNB VIN INTERNAL BIAS VIN COUT40 OPT 1206 COUT39 OPT 1206 3 J9 2 C25 1uF COUT38 OPT 1206 COUT37 OPT 1206 COUT36 7343H OPT UVLO CIRCUIT L5 1 5VBIAS E25 + COUT48 OPT 1206 COUT47 OPT 1206 BIA SUPPLY & UVLO CIRCUIT 5V / 400mA OPT R86 OPT VOB+ COUT41 OPT 1206 R114 OPT R84 R85 OPT COUT31 7343H OPT RUNA THDN1 R92 R108 OPT 7 THDN2 R94 OPT C27 0.1uF 16V D2 PMEG4005AEA 6 U8 R93 100 1 2 5 3 GND C29 2.2uF 16V R100 127K 1% OUT R95 OPT R96 OPT SGND SGND OPT VIN 8 9 SGND CLKINA +INA GND LT6703IDC-3 UVLO THRESHOLD = 5.5V RISING 1 R87 2 OPT 1 R88 5 R91 4 OPT 5 6 6 7 7 RUNA RUNB 8 CLKINA RUNB SGND SGND SGND CLKOUTB TRACK/SSA TRACK/SSB COMPA IAVGA MILL MAXX 803-43-008-20-001000 COMPB 2 CLKOUTB IAVGB VOA+ VOB+ R101 OPT VCCB 2010 FBB VCCA R103 OPT CONNECT TO PARALLEL DC1755A FBA R104 OPT R102 OPT 2010 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 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. APPROVALS PCB DES. APP ENG. TECHNOLOGY AK MIKE S. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER SIZE C TRACK/SSB 8 1 B COMPB 3 OPT 4 THDN4 IAVGB 2 R89 OPT 3 MILL MAXX 802-40-008-20-001000 CONNECT TO PARALLEL DC1755A 4 RIGHT ANGLE J10 SOCKET OPTIONAL COMPONENTS FOR SINGLE OUTPUT CONVERTER WITH 4,6 or 12 PHASES THDN3 VS R106 10K A DISBL#4 PWMEN4 OPT VOB+ 4 R78 OPT R83 OPTIONAL COUT DISBL#3 R74 R77 OPT LOAD STEP 10mV / Amp E24 PWMEN3 DISBL#1 R73 N/A SCALE = NONE DATE: IC NO. REV. LTC3860EUH 2 DEMO CIRCUIT 1755A Monday, January 16, 2012 SHEET 3 E OF 3 1