A B C D E REVISION HISTORY Place on edge of board CLKOUT E2 5VBIAS R1 OPT 0 R13 R14 OPT 0 TP7 VIN 10 11 33 VSNSOUT2 VSNSOUT3 VSNSOUT4 VSNSOUT1 R106 R107 R108 0 OPT 0 34 CIN3 CIN4 22uF 25V 1210 TP8 2 1 PWM ZCD# 32 3 VCC 4 AGND 6 5 PVCC VIN PGND 13 PGND 15 PGND 16 SW RUN4 C3-4 OPT R3-4 OPT 2 1 ZCD# PWM 3 VCC 4 32 AGND AGND 5 BOOT 6 NC 24 SW SW 23 SW 22 SW SW 21 20 SW 19 SW 18 SW SW COUT1,2,6,7,11,12,16,17: VOS2+ C41 OPT R53 10 VOUT2 COUT6 COUT7 100uF 6.3V 1206 R56 0 + R32 OPT 2010 R64 10K 13 2 1 PWM ZCD# 3 VCC 32 4 BOOT AGND AGND VIN PGND PGND GL PGND GL U4 FDMF5820DC PGND 15 5 PVCC PGND 14 R66 OPT PGND J5 C12 10uF 0805 VOS2E12 OPT TP3 30 29 28 35 27 2 C27 2.2uF 16V 26 24 SW VOS3+ C42 OPT L3 COUT11 COUT12 100uF 6.3V 1206 R73 0 E15 R71 10 VOUT3 0.25uH 744301025 R72 3.57K 1% 25 SW R70 24.9K C29 OPT + R33 0 mOhm 2010 1 R37 0 mOhm 2010 COUT13 COUT14 COUT15 330uF 2.5V VOS3+ J7 C28 10uF 0805 E16 R79 0 VOS3- VOS3- VOS4+ C31 0.22uF R81 OPT 1% R77 10 VOUT4 C30 2.2uF 16V R80 10K PGND PGND PGND -C 1.2V/120A PWM 2 1 3 VCC ZCD# 32 5 6 4 BOOT AGND AGND GL U5 FDMF5820DC PGND SW SW SW 15 1.2V/60A GL SW 14 PGND PGND 23 13 VIN 22 1.8V/60A 12 SW 1.8V/30A 1.5V/30A 1.2V/30A 1.0V/30A 34 21 CIN9 CIN10 22uF 25V 1210 SW VOUT4 16 -B VOUT3 PVCC SW -A VOUT2 TMON VIN 20 33 VOUT1 VIN 19 11 EN/FAULT# SW 10 E19 VIN 18 9 NC 7 VIN R83 100K PHASE 8 + R82 OPT SW R84 10K 28 27 26 25 24 COUT18 COUT19 COUT20 330uF 2.5V C34 2.2uF 16V R86 24.9K R85 OPT C43 OPT CUSTOMER NOTICE L4 0.25uH 744301025 R87 3.57K 1% R88 0 COUT16 COUT17 100uF 6.3V 1206 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. B C D J9 VOUT4- E20 VOS4- OPT 1 VOS4- 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 APPROVALS PCB DES. HZ APP ENG. MIKE S. TECHNOLOGY TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A VOUT4+ C33 10uF 0805 J10 30 35 VOS4+ E18 OPT TP4 31 29 VOUT3+ 1.2V / 60A VOUT3- J8 R74 10 0 FB4 VOUT2- J6 R36 OPT 2010 TRK/SS4 R76 VOUT2+ COUT8 COUT9 COUT10 330uF 2.5V R67 10K 31 SW R75 VOS2+ E11 OPT 1 SW 12 Murata GRM31CR60J107M (100uF, 6.3V, X5R, 1206) 3 0.25uH 744301025 R55 3.57K 1% 25 23 34 VOS1- L1-4: Wurth 744301025 (0.25uH, DCR=0.325mOhms +/-7%) L2 26 TMON SW 33 R1-4 OPT VSNSOUT4 27 VIN 22 OPT C1-4 35 VIN SW OPT VOUT1- R49 10K R52 24.9K C10 2.2uF 16V 28 EN/FAULT# SW R69 11 CIN7 CIN8 22uF 25V 1210 RUN4 R2-4 OPT VIN SW 9 21 ILIM4 RUN3 17 16 OPT 10 C2-4 29 SW C21 2.2uF 16V 20 30 C24 0.22uF IAVG4 C26 VOUT1+ 1.8V / 60A TP2 C22 0.22uF NC 32 0 C23 0.22uF SW 33 31 R62 6 34 OPT 43.2K 100pF J3 J4 VOS2- PHASE 35 TRK/SS3 C19 R61 ILIM3 IAVG3 C20 VINVIN- Sanyo 16SVP180MX (180uF, 30mOhms, 3.02A, 16V) C5 10uF 0805 R35 0 mOhm 2010 0 19 RB-4 VOS4OPT 7 8 IAVG4 36 PHASE VIN ISNS4P 37 VIN+ 7V - 14V 30 SW R59 R60 5VBIAS PGOOD4 COUT3 COUT4 COUT5 330uF 2.5V R58 OPT 7 VSNSN4 38 PGND 8 50 49 PWM2 PGOOD1 ISNS4N 39 U3 FDMF5820DC PGND OPT OPT OPT OPT COMP4 2 JP4 52 ISNS3N VSNSOUT4 OPT R78 OPT C32 OPT 51 ISNS3P VSNSOUT3 40 GL PGND 14 15 C14 0.22uF C15 IAVG2 R57 ILIM2 C16 TRK/SS2 C17 PGND SW 3 RUN2 VSNSN3 41 13 GL 17 OFF 53 IAVG3 42 C13 0.22uF 12 J1 CIN2 180uF 16V COUT3-5,8-10,13-15,18-20: Panaasonic EEFSX0E331ER (330uF, 2.5V, 9mOhms) 31 PGND SW 1 RUN1 VSNSP3 VIN RUN4 OPT PWM1 ILIM3 RB-3 VOS310k TRK/SS4 E17 ON RT-4 OPT CLKOUT TRACK/SS3 COMP3 44 43 43.2K 100pF R48 OPT PVCC SW VOS4+ RT-3 10.0K 56 FB3 SGND VOS3+ E14 55 PGOOD2 59 R68 100K 54 VCC VSNSP4 R31 0 mOhm 2010 R45 10K PGND 18 19 C7 2.2uF 16V VIN VIN 18 5VBIAS TRACK/SS4 + E8 TMON SW 17 VINSNS 45 R51 C11 + VOS1- EN/FAULT# 17 R2-3 4.99K 16 C2-3 100pF TRACK/SS2 FB2 2 PGOOD3 COUT1 COUT2 100uF 6.3V 1206 R34 0 R38 3.57K 1% VIN 16 VSNSOUT3 C3-3 3.3nF C1-3 2.2nF R1-3 10.0K COMP2 47 46 ILIM1 IAVG1 34 CIN5 CIN6 22uF 25V 1210 ILIM4 R3-3 332 R65 10k 1% 15 ILIM2 PGOOD3 RUN3 IAVG2 VSNSP2 48 29 13 VSNSN2 28 12 ISNS2P RUN3 11 FB3 COMP3 C1-2 OPT 9 10 VSNSOUT2 27 COMP2 FB2 ISNS1N PWM3 C18 1uF 8 IAVG1 ISNS2N PGOOD4 C2-2 OPT 7 ILIM1 SGND PWM4 VOS2- 33 ISNS1P 26 JP3 RB-2 OPT 14 2 C25 OPT 6 RUN4 3 R2-2 OPT R1-2 OPT VSNSOUT1 5 20 OFF RT-2 OPT R3-2 OPT R63 18.2K RUN3 ON C3-2 OPT VIN 4 TRACK/SS4 TRK/SS3 E13 1 24 1 VIN 11 U1 LTC7851EUHH VSNSN1 24 VOS2+ VSNSP1 3 VCC 1 VSNSOUT2 2 RB-1 VOS110.0K 23 R54 RT-1 20.0K COMP1 FREQ FB1 VOS1+ 5VBIAS 1 COMP4 COMP1 VIN 10 RUN1 RUN2 CLKIN 100pF E10 TRACK/SS3 0.25uH 744301025 25 R47 0 9 22 PGOOD2 1.5nF C2-1 R50 100K 0 C8 0.22uF C1-1 R2-1 6.98K 5VBIAS 3 R44 30.9K TRK/SS1 58 JP2 R46 OPT 1% 57 C9 OPT TRACK/SS1 3 2 C6 OPT FB4 OFF 26 SW CIN1 180uF 16V VIN+ VOS1+ E6 R29 10 VOUT1 L1 0 R42 R3-1 332 3.3nF R1-1 10.0K RUN2 21 1 R41 Fsw = 400kHz FB1 C3-1 25 R43 OPT RUN2 OPT ON 27 SW R40 VSNSOUT1 DATE 10-21-15 VOS1+ R39 10 VIN Mike S. CIN3-10: Murata GRM32ER71E226K (22uF, 16V, X5R, 1210) C40 OPT R28 24.9K C4 2.2uF 16V 35 GL U2 FDMF5820DC PGND 14 APPROVED 4 CIN1,2: 30 28 E3 E5 TP1 29 GL PGND DESCRIPTION PRODUCTION J2 TRK/SS2 E9 1 BOOT TMON VIN E7 TRACK/SS2 2 R11 10K 31 VIN PGND 12 R9 OPT EN/FAULT# SW R12 TP6 0 9 IAVG4 0 TP5 R30 100K 0 IAVG3 TRK/SS4 R27 + 23 5VBIAS PGOOD1 OPT IAVG2 TRK/SS3 R26 R7 10K SW 0 IAVG1 TRK/SS2 R25 22 JP1 R21 0 FB4 ILIM4 R24 SW C3 OPT R20 10k 1% ILIM3 R23 7 ILIM2 R22 FB3 TRK/SS1 21 R19 OPT 2 R18 0 20 OFF 3 RUN1 R17 OPT SW R15 18.2K R16 0 19 ON 1 R6 0 ILIM1 4 RUN1 R5 OPT NC FB2 R4 0 C1 2.2uF 16V C2 0.22uF SW R10 0 RUN4 18 VIN FB1 RUN3 8 E4 OPT RUN2 VIN R8 RUN1 COMP4 PHASE VCC TRK/SS1 COMP3 0 SW TRACK/SS1 COMP2 R3 SW COMP1 REV __ VIN Components to parallel two or more phases 17 Place these components on edge of board ECO 1 0 AGND R2 SW CLKIN E1 DATE: LTC Confidential-For Customer Use Only HIGH OUTPUT CURRENT 4 PHASE STEP-DOWN CONVERTER LTC7851EUHH DEMO CIRCUIT 2380A-B IC NO. N/A SCALE = NONE www.linear.com Fax: (408)434-0507 Wednesday, January 27, 2016 E SHEET 1 REV. 2 OF 2 A B C D E 4 4 DYNAMIC LOAD CIRCUIT FOR VOUT1 AND VOUT2 TO-263 = D2PAK E22 Q1 SUM60N02-3m9P TO-263 PULSE GEN A E24 GND BIAS SUPPLY FOR DrMOS and LTC7851 VOUT1 Q2 SUM60N02-3m9P TO-263 OPT R93 10k 1% VOUT1 VIN 3 VOUT2 C37 2.2uF 16V J12 R90 OPT 2512 VOUT2 9 2 4 J13 LOAD STEP A 2mV / Amp 5% DUTY CYCLE MAX. R95 0.002 1% 2512 L5 22uH CDRH4D22/HPNP-220MC U6 LT3970EMS J11 R89 0 mOhm 2512 5VBIAS R97 100K 5 VIN SW PG BOOST EN BD GND FB GND RT 6 C35 0.1uF R91 C39 22pF R92 1.0M 7 C36 10uF 6.3V 0805 0 1206 5VBIAS E21 C38 10uF 6.3V 0805 8 5V / 350mA E23 5V / 350mA 1 R94 316K 10 R98 226K GND 11 3 3 5VBIAS 1 ON TO-263 = D2PAK E25 Q3 SUM60N02-3m9P TO-263 TO-263 PULSE GEN B E26 GND Q4 SUM60N02-3m9P TO-263 OPT R103 10k 1% R104 0.002 1% 2512 2 2 3 OFF DYNAMIC LOAD CIRCUIT FOR VOUT3 AND VOUT4 R100 OPT JP5 VOUT3 R101 0 mOhm 2512 R99 OPT J14 VOUT3 VOUT4 J15 R102 OPT 2512 VOUT4 J16 LOAD STEP B 2mV / Amp 5% DUTY CYCLE MAX. VOUT1 + COUT23 COUT22 COUT21 OPT 7343-D15T VOUT2 + COUT26 COUT24 COUT25 OPT 7343-D15T + COUT28 COUT29 COUT27 OPT 7343-D15T VOUT3 + COUT31 COUT30 COUT32 OPT 7343-D15T + VOUT4 COUT34 COUT35 COUT33 OPT 7343-D15T + COUT37 COUT36 COUT38 OPT 7343-D15T + COUT39 COUT41 COUT40 OPT 7343-D15T + COUT43 COUT42 COUT44 OPT 7343-D15T 2 1 1 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. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 APPROVALS PCB DES. HZ APP ENG. MIKE S. TECHNOLOGY TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B C D N/A SCALE = NONE DATE: IC NO. www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only HIGH OUTPUT CURRENT 4 PHASE STEP-DOWN CONVERTER LTC7851EUHH DEMO CIRCUIT 2380A-B Tuesday, January 19, 2016 SHEET 2 E REV. 2 OF 2