1
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
DESCRIPTION
LTC7852
High Efficiency 6-Phase Step-Down Converter
Demonstration circuit 2631A features the LTC
®
7852 in two
high output current, high efficiency step down converters
each with its own assembly type. The converter for the -A
assembly provides two 3-phase outputs of 1.0V/100A and
1.5V/100A. The -B assembly provides a single 6-phase
1.0V/200A output. Block diagrams are shown in Figure3.
Both converters operate over a 7V to 14V input voltage
range at a switching frequency of 400kHz.
The power stage for each phase consists of a 5mm ×
5mm DrMOS and 11.3mm × 11.0mm 0.25µH ferrite
inductor with a DCR of 0.32mΩ typical. The LTC7852
employs a peak current mode architecture which allows
accurate DCR sensing and sharing with sub-mOhm DCR
inductors. The LTC7852 provides a three-state compatible
PWM output for each DrMOS.
Additional features of the DC2631A include:
l
Differential sensing for the output voltages of VOUT1
and VOUT2 All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
l IMON pins to monitor the inductor current of each rail.
l
Optional resistors and jumpers to change the phase
arrangement for VOUT1 and VOUT2:
q VOUT1: 4ph, VOUT2: 2ph
q VOUT1: 5ph, VOUT2: 1ph
q Note, the default arrangement is:
VOUT1: 3ph, VOUT2: 3ph
l Optional resistors and jumpers to parallel VOUT1
andVOUT2.
l RUN, PGOOD, PLLIN and CLKOUT pins
The LTC7852 data sheet provides a complete descrip-
tion of the IC operation and application information. The
data sheet must be read in conjunction with the quick
startguide.
Design files for this circuit board are available.
Specifications are at TA = 25°C, for the -A Assembly
PARAMETER CONDITIONS VALUE
Input Voltage Range 7V to 14V
VOUT1 VIN = 7V to 14V, IOUT1 = 0A to 100A 1.0V ± 1.5%
IOUT1 VIN = 7V to 14V, VOUT1 = 1.0V 100A
VOUT1 Typical Efficiency (See Figure4) VIN = 12V, IOUT1 = 100A 90.3% Typical
VOUT2 VIN = 7V to 14V, IOUT2 = 0A to 100A 1.5V ± 2%
IOUT2 VIN = 7V to 14V, VOUT2 = 1.5V 100A
VOUT2 Typical Efficiency (See Figure5) VIN = 12V, IOUT2 = 100A 93.3% Typical
Nominal Switching Frequency 400kHz
2
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
QUICK START PROCEDURE
The evaluation setup for demonstration circuit 2631A-A/
A-B is straight forward. Refer to the diagram shown
inFigure1.
Next, follow the procedure below:
1) With power off, connect the input supply, load and
meters as shown in Figure1. Preset the load to 0A
and the VIN supply to 0V.
2) Place the RUN1, RUN2 and 5V BIAS jumpers in the
ONposition.
3) Slowly increase the input voltage to 12.0V while moni-
toring VOUT1 and/or VOUT2.
4) At an input voltage of 12.0V, check VOUT1 and/or VOUT2.
The output voltage(s) should be within the regulation
limits shown in the Performance Summary table.
5) Apply full load to the output(s) and re-measure the out-
put voltages. They should be within the regulationlimits.
6) After the basic performance has been verified, the
other aspects of performance can be measured
andobserved.
DYNAMIC LOAD CIRCUITS
The DC2631A-A/DC2631B-B provides a load step circuit
for VOUT1 and VOUT2. Each load step circuit consists of a
load step MOSFET with a 2mΩ sense resistor at its source.
To use it, connect the output of a pulse generator between
the PULSE GEN pin and the GND pin. Monitor the load
step signal across the ISTEP+ and ISTEP– pins. Monitor
the output voltage with the VOUT BNC. See Figure2 for the
setup. For safe operation for a 0A to 200A load step, limit
the duty cycle to 5% or less. The load step responses are
shown in Figure9 through Figure 11.
Note 1:
200 LFM airflow or more is recommended when full load
is applied to both outputs of the -A assembly or when full
load is applied to the output of the -B assembly. Thermal
images are shown in Figure7 and Figure 8.
Note 2:
When powering the board, first connect the input supply
to the DC2631A. Next, turn-on the input supply. Do not
hot plug. This could cause large input voltage transients
that may damage the converter.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C, for the -B Assembly
PARAMETER CONDITIONS VALUE
Input Voltage Range 7V to 14V
VOUT1 VIN = 7V to 14V, IOUT1 = 0A to 200A 1.0V ± 1.5%
IOUT1 VIN = 7V to 14V, VOUT1 = 1.0V 200A
VOUT1 Typical Efficiency (See Figure6) VIN = 12V, IOUT1 = 200A 90.0% Typical
Nominal Switching Frequency 400kHz
3
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
QUICK START PROCEDURE
IOUT2
VOUT2
VOUT1
LOAD #2
LOAD #1
DC2631A-A FO1a
IOUT1
IIN
VIN
VIN
SUPPLY
+
–
–
+
–
+
+
–
VOUT1
DC2631A-A FO1b
IOUT1
IIN
VIN
VIN
SUPPLY +
–
LOAD A LOAD B
–
+
NOTE: FOR ACCURATE EFFICIENCY MEASUREMENTS, MONITOR VOUT1 ACROSS THE CERAMIC AT COUT1
AND VOUT2 ACROSS THE CERAMIC AT COUT7. THE VOS± TURRETS MONITOR THE OUTPUT VOLTAGE AT
THE BULK OUTPUT CAPACITORS
(a) DC2631A-A
(a) DC2631A-B
Figure1. Proper Measurement Setup
4
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
QUICK START PROCEDURE
Figure2. Setup of the Dynamic Load Circuits
PHASE 1
0°
PHASE 2
120°
PHASE 3
240°
PHASE 4
60°
PHASE 5
180°
PHASE 6
300°
VOUT1
1.0V/100A
VOUT2
1.5V/100A
VIN
7V to 14V
PHASE 1
0°
PHASE 2
120°
PHASE 3
240°
PHASE 4
60°
PHASE 5
180°
PHASE 6
300°
VOUT1
1.0V/200A
VIN
7V to 14V
BLOCK DIAGRAM OF THE -A ASSEMBLY. VOUT1 PROVIDES A
3-PHASE 1.0V/100A OUTPUT AND VOUT2 PROVIDES A 3-PHASE
1.5V/100A OUTPUT
BLOCK DIAGRAM OF THE -B ASSEMBLY. VOUT1 PROVIDES A
6-PHASE 1.0V/200A OUTPUT
DC2631A F03
Figure3. Block Diagram of the DC2631A-A/DC2631B-B
PULSE
GENERATOR OUT
TO OSCILLOSCOPE
DC2631A-A F02
5
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
QUICK START PROCEDURE
70%
75%
80%
85%
90%
95%
100%
0 10 20 30 40 50 60 70 80 90 100 110
EFFICIENCY
LOAD CURRENT (A) DC2631A-A F04
VIN = 7V
VIN = 10V
VIN = 12V
VIN = 14V
COMPONENTS/CONDITIONS:
• DrMOS = FDMF5820DC
• FSW = 400KHZ
• L = WURTH 744301025 (0.25µH, 0.32MΩ)
• OTHER RAIL DISABLED
• EXTERNAL 5V BIAS APPLIED (EFFICIENCY INCLUDES BIAS POWER)
• NO AIRFLOW
70%
75%
80%
85%
90%
95%
100%
0 10 20 30 40 50 60 70 80 90 100 110
EFFICIENCY
LOAD CURRENT (A) DC2631A-A F05
VIN = 7V
VIN = 10V
VIN = 12V
VIN = 14V
70%
75%
80%
85%
90%
95%
100%
0 20 40 60 80 100 120 140 160 180 200 220
EFFICIENCY
LOAD CURRENT (A) DC2631A-A F06
VIN = 7V
VIN = 10V
VIN = 12V
VIN = 14V
Figure4. Efficiency of the 1.0V/100A Rail of the DC2631A-A
Figure5. Efficiency of the 1.5V/100A Rail of the DC2631A-A
Figure6. Efficiency of the 1.0V/200A Rail of the DC2631A-B
COMPONENTS/CONDITIONS:
• DrMOS = FDMF5820DC
• fSW = 400KHZ
• L = WURTH 744301025 (0.25µH, 0.32MΩ)
• OTHER RAIL DISABLED
• EXTERNAL 5V BIAS APPLIED
(EFFICIENCY INCLUDES BIAS POWER)
• NO AIRFLOW
COMPONENTS/CONDITIONS:
• DrMOS = FDMF5820DC
• fSW = 400KHZ
• L = WURTH 744301025 (0.25µH, 0.32MΩ)
• OTHER RAIL DISABLED
• EXTERNAL 5V BIAS APPLIED
(EFFICIENCY INCLUDES BIAS POWER)
• NO AIRFLOW
COMPONENTS/CONDITIONS:
• DrMOS = FDMF5820DC
• fSW = 400KHZ
• L = WURTH 744301025 (0.25µH, 0.32MΩ)
• EXTERNAL 5V BIAS APPLIED
(EFFICIENCY INCLUDES BIAS POWER)
• NO AIRFLOW
6
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
Figure7. Thermal Image of the 1.0V/100A 3-Phase and 1.5V/100A 3-Phase Converter (DC2631A-A) at VIN = 12V,
Full Load on Both Outputs. Tambient = 24°C with 200 LFM Airflow. Hot Spot is DrMOS of Phase 4.
DrMOS = FDMF5820DC, L = Wurth 744301025, fSW = 400kHz.
Figure8. Thermal Image of the 1.0V/200A 6-Phase Converter (DC2631A-B) at VIN = 12V,
Full Load. Tambient = 24°C with 200 LFM Airflow. Hot Spot is DrMOS of Phase 4.
DrMOS = FDMF5820DC, L = Wurth 744301025, fSW = 400kHz.
Ph6
Inductors
DrMOS
Ph1
CinBulk #1
CinBulk #2
Airflow
Ph6
Inductors
DrMOS
Ph1
CinBulk #1
CinBulk #2
Airflow
QUICK START PROCEDURE
7
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
QUICK START PROCEDURE
Figure9. 50% to 100% Load Step Response of the 1.0V/100A 3-Phase Rail of the DC2631A A. VIN = 12V.
COUT = 9x (330µF, 9mΩ) || 3x (220µF, X5R, 1210), fSW = 400kHz
Figure10. 50% to 100% Load Step Response of the 1.5V/100A 3-Phase Rail of the DC2631A A. VIN = 12V.
COUT = 9x (330µF, 9mΩ) || 3x (220µF, X5R, 1210), fSW = 400kHz
Figure11. 50% to 100% Load Step Response of the 1.0V/200A 6-Phase Rail of the DC2631A B. VIN = 12V.
COUT = 18x (330µF, 9mΩ) || 6x (220µF, X5R, 1210), fSW = 400kHz
50µsec/DIV
100A
50A
VOUT1(AC)
50mV/DIV
LOAD STEP
50A/DIV
DC2631A-A F09
50µsec/DIV
100A
50A
VOUT2(AC)
50mV/DIV
LOAD STEP
50A/DIV
DC2631A-A F10
50µsec/DIV
200A
100A
VOUT1(AC)
50mV/DIV
LOAD STEP
100A/DIV
DC2631A-A F11
8
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Component DC2631A-A
1 14 C1, C2, C5, C6, C18, C19, C24, C25,
C28, C29, C32, C33, C36, C37
CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
2 18 C3, C4, C8, C9, C10, C11, C12, C13,
C14, C15, C16, C17, C20, C21, C22,
C23, C34, C35
CAP., 0.22µF, X5R, 25V, 10%, 0603 AVX, 06033D224KAT2A
MURATA, GRM188R61E224KA88D
NIC, NMC0603X5R224K25TRPF
TAIYO YUDEN, TMK107BJ224KA-T
3 2 C30, C31 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104JAT4A
4 2 C46, C47 CAP., 1µF, X7R, 50V, 10%, 0805 AVX, 08055C105KAT2A
TAIYO YUDEN, UMK212B7105KG-T
TDK, C2012X7R1H105K125AB
5 2 C48, C50 RES., AEC-Q200, 100Ω, 1%, 1/8W, 0805 VISHAY, CRCW0805100RFKEA
6 2 C49, C51 CAP., 47µF, X5R, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212BBJ476MG-T
TDK, C2012X5R0J476M125AC
TAIYO YUDEN, JMK212BJ476MG-T
7 1 C7 CAP., 1µF, X5R, 25V, 20%, 0603 AVX, 06033D105MAT2A
TAIYO YUDEN, TMK107BJ105MA-T
TDK, C1608X5R1E105M080AC
8 12 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6,
CIN7, CIN8, CIN9, CIN10, CIN11, CIN12
CAP., 22µF, X5R, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L
TAIYO YUDEN, TMK325BJ226KM-P
AVX, 12103D226KAT2A
TAIYO YUDEN, TMK325BJ226KM-T
9 2 CIN13, CIN14 CAP., 180µF, 30mΩ, ALUM. POLYMER, 16V,
20%, SMD"
PANASONIC, 16SVP180MX
10 1 CITH1 CAP., 3300pF, X7R, 50V, 10%, 0603 AVX, 06035C332KAT2A
MURATA, GRM188R71H332KA01D
NIC, NMC0603X7R332K50TRPF
11 1 CITH2 CAP., 2200pF, C0G, 50V, 5%, 0603 MURATA, GCM1885C1H222JA16D
12 2 CITHP1, CITHP2 CAP., 150pF, NP0, 50V, 5%, 0603 AVX, 06035A151JAT2A
13 6 COUT1, COUT3, COUT5, COUT7,
COUT9, COUT11
CAP., 220µF, X5R, 4V, 20%, 1206, NO SUBS.
ALLOWED
MURATA, GRM31CR60G227ME11L
14 18 COUT13, COUT14, COUT15, COUT16,
COUT17, COUT18, COUT19, COUT20,
COUT21, COUT22, COUT23, COUT24,
COUT25, COUT26, COUT27, COUT28,
COUT29, COUT30
CAP., 330µF, 9mΩ, ALUM. POLYMER, 2.5V,
20%, 7343, 6.3A"
PANASONIC, EEFSX0E331ER
15 6 L1, L2, L3, L4, L5, L6 INDUCTOR, 0.25µH, 0.32mΩ WURTH ELEKTRONIK, 744301025
16 6 R19, R23, R38, R41, R66, R69 RES., 715Ω, 1%, 1/10W, 0603 NIC, NRC06F7150TRF
SAMSUNG, RC1608F7150CS
YAGEO, RC0603FR-07715RL
17 6 R20, R21, R22, R24, R25, R26 RES SMD 2.32KΩ, 1%, 1/10W, 0603 VISHAY, CRCW06032K32FKEA
18 24 R3, R5, R7, R8, R11, R12, R14, R16,
R17, R18, R27, R29, R39, R40, R46,
R49, R67, R68, R105, R110, R113,
R116, R119, R122
RES., AEC-Q200, 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
NIC, NRC06ZOTRF
19 4 R33, R34, R54, R55 RES., COPPER, 0mΩ, JUMPER, 2010 TEPRO OF FLORIDA, RN6083
DEMO CIRCUIT 2631A-A
9
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
20 4 R37, R50, R64, R76 RES., 10 Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA
NIC, NRC06F10R0TRF
PANASONIC, ERJ3EKF10R0V
Rohm, MCR03EZPFX10R0
YAGEO, RC0603FR-0710RL
21 7 R4, R6, R28, R30, R42, R47, R48 RES., AEC-Q200, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA
22 1 R44 RES., 37.4kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060337K4FKEA
23 2 R72, R73 RES., AEC-Q200, 39.2kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060339K2FKEA
24 2 R78, R79 RES., AEC-Q200, 100kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA
NIC, NRC06F1003TRF
PANASONIC, ERJ3EKF1003V
25 17 R9, R10, R31, R32, R51, R52, R74,
R75, R92, R93, R96, R97, R101, R102,
RB1, RB2, RT1
RES., AEC-Q200, 10kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA
KOA SPEER, RK73H1JTTD1002F
PANASONIC, ERJ3EKF1002V
26 6 R94, R95, R99, R100, R103, R104 RES., 24.9kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060324K9FKEA
PANASONIC, ERJ3EKF2492V
27 1 RITH1 RES., 4.99kΩ, 1%, 1/10W, 0603 VISHAY, CRCW06034K99FKEA
28 1 RITH2 RES., AEC-Q200, 7.5kΩ, 1%, 1/10W, 0603 VISHAY, CRCW06037K50FKEA
29 1 RT2 RES., 20kΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF2002V
VISHAY, CRCW060320K0FKEA
YAGEO, RC0603FR-0720KL
30 6 U1, U2, U3, U4, U5, U6 IC, SMAT POWER STAGE MODULE FAIRCHILD, FDMF5820DC
31 1 U7 IC, DUALOUTPUT 6-PHASE CONTROLLER,
GQFN-48 (5x6)
ANALOG DEVICES,
LTC7852ERHE#TRPBF
Dynamic Load Circuits
1 2 Q1, Q2 XSTR., N-CH, TRENCH MOSFET, 30V, 80A,
TO-263AB
FAIRCHILD SEMI, FDB8832
2 2 R85, R90 RES., AEC-Q200, 10kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA
KOA SPEER, RK73H1JTTD1002F
PANASONIC, ERJ3EKF1002V
3 2 R87, R91 RES., SENSE, 0.002Ω, 1%, 1W, 2512 VISHAY, WSL25122L000FEA
Bias Supply for DrMOS and LTC7852
1 1 C41 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104JAT4A
2 1 C40 CAP., 1µF, X7R, 50V, 10%, 0805 AVX, 08055C105KAT2A
TAIYO YUDEN, UMK212B7105KG-T
TDK, C2012X7R1H105K125AB
3 1 C42 CAP., 22µF, X5R, 6.3V, 20%, 0805 MURATA, GRM21BR60J226ME39L
SAMSUNG, CL21A226MQQNNNE
TDK, C2012X5R0J226M125AC
4 1 C43 CAP., 10µF, X5R, 6.3V,1 0%, 0805 AVX, 08056D106KAT2A
KEMET, C0805C106K9PAC7800
KEMET, C0805C106K9PACTU
5 1 D1 DIODE, SCHOTTKY BARRIER RECTIFIER,
40V 500mA, SOD-323"
NXP, PMEG4005AEA,115
6 1 L7 IND, 15µH, HIGH CURRENT LOW PROFILE SMD Eaton, MP14020V2-150-R
7 1 R89 RES., AEC-Q200, 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
NIC, NRC06ZOTRF
10
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
8 1 R84 RES., AEC-Q200, 0Ω, 1/4W, 1206 VISHAY, CRCW12060000Z0EA
PANASONIC, ERJ8GEY0R00V
NIC, NRC12ZOTRF
9 1 R86 RES., 105kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603105KFKEA
NIC, NRC06F1053TRF
10 1 R88 RES., 20kΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF2002V
VISHAY, CRCW060320K0FKEA
YAGEO, RC0603FR-0720KL
11 1 U8 IC, 1.1MHz/2.2MHz, 500mA STEP-DOWN
REGULATOR
ANALOG DEVICES, LT3502EDC#PBF
3.3V Auxiliary Supply
1 1 C68 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
2 1 C69 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
3 1 C66 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
4 1 C67 CAP., 220pF, X7R, 50V, 5%, 0603 AVX, 06035C221JAT2A
5 1 R125 RES., AEC-Q200, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA
6 1 R127 RES., AEC-Q200, 100kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA
NIC, NRC06F1003TRF
PANASONIC, ERJ3EKF1003V
7 1 R129 RES., AEC-Q200, 0Ω, 1/4W, 1206 VISHAY, CRCW12060000Z0EA
PANASONIC, ERJ8GEY0R00V
NIC, NRC12ZOTRF
8 1 R126 RES., AEC-Q200, 1MΩ, 1%, 1/10W, 0603 VISHAY, CRCW06031M00FKEA
NIC, NRC06F1004TRF
PANASONIC, ERJ3EKF1004V
9 1 R128 RES., AEC-Q200, 162kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603162KFKEA
PANASONIC, ERJ3EKF1623V
ROHM, MCR03EZPFX1623
10 1 U9 IC, LDO uPWR LINEAR REG., MSOP-8 ANALOG DEVICES, LT3010EMS8E#PBF
ANALOG DEVICES,
LT3010EMS8E#TRPBF
Additional Components
1 0 C26, C27, C38, C39, C52, C53, C54,
C55, C56, C57, C58, C59, C60, C61,
C62, C63, C64, C65
CAP., OPTION, 0603
2 0 CIN15 CAP., OPTION, ALUM. ELECT., SMD
3 0 CIN16, CIN17, CIN18, CIN19, CIN20,
CIN21, CIN22, CIN23, CIN24, CIN25,
CIN26, CIN27
CAP., OPTION, 1210
4 0 COUT2, COUT4, COUT6, COUT8,
COUT10, COUT12
CAP., OPTION, 1206
5 0 COUT31, COUT32, COUT33, COUT34,
COUT35, COUT36, COUT37, COUT38,
COUT39, COUT40, COUT41, COUT42,
COUT43, COUT44, COUT45, COUT46,
COUT47, COUT48
CAP., OPTION, 7343
PARTS LIST
11
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
6 0 R13, R15, R35, R36, R43, R45, R53,
R56, R57, R58, R59, R60, R61, R62,
R63, R65, R70, R71, R77, R80, R81,
R82, R83, R106, R107, R108, R109,
R111, R112,
R114, R115, R117, R118, R120, R121,
R123, R124
RES., OPTION, 0603
7 0 R1,R2 RES., OPTION, 2010
Hardware
1 29 E1, E2, E3, E4, E5, E6, E7, E8, E9, E10,
E11, E12, E13, E14, E15, E16, E17, E18,
E19, E20, E21, E22, E23, E24, E25, E26,
E27, E28, E29
TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 6 J1, J2, J3, J4, J5, J6 STUD, FASTENER, #10-32 PENNENGINEERING, KFH-032-10ET
3 2 J7, J8 CONN., RF, BNC, RCPT JACK, 5-PIN, STR, THT,
50Ω
AMPHENOL RF, 112404
4 6 JLRE1, JLRE2, JLRE3, JLRE4, JLRE5,
JLRE6
"RING, LUG, CRIMP, #10, NON-INSULATED,
SOLDERLESS TERMINALS
KEYSTONE, 8205
5 12 JNE1, JNE2, JNE3, JNE4, JNE5, JNE6,
JNE7, JNE8, JNE9, JNE10, JNE11,
JNE12
NUT,HEX, #10-32, BRASS PENCOM, NU1132
6 4 JP1, JP2, JP3, JP4 "CONN.,HDR,MALE, 1x3, 2mm, THT, STR,
NO SUBS. ALLOWED"
Wurth Elektronik, 62000311121
7 6 JWE1, JWE2, JWE3, JWE4, JWE5,
JWE6
WASHER, #10, LOCK, EXT, TIN FINISH PENCOM, WA4526
8 4 MP1,MP2,MP3,MP4 STANDOFF, NYLON, SNAP-ON, 0.625" KEYSTONE, 8834
9 4 XJP1, XJP2, XJP3, XJP4 CONN., SHUNT, FEMALE, 2 POS, 2mm Wurth Elektronik, 60800213421
12
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Component DC2631A-B
1 14 C1, C2, C5, C6, C18, C19, C24, C25,
C28, C29, C32, C33, C36, C37
CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
2 18 C3, C4, C8, C9, C10, C11, C12, C13,
C14, C15, C16, C17, C20, C21, C22,
C23, C34, C35
CAP., 0.22µF, X5R, 25V, 10%, 0603 AVX, 06033D224KAT2A
MURATA, GRM188R61E224KA88D
NIC, NMC0603X5R224K25TRPF
TAIYO YUDEN, TMK107BJ224KA-T
3 2 C30, C31 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104JAT4A
4 2 C46, C47 CAP., 1µF, X7R, 50V, 10%, 0805 AVX, 08055C105KAT2A
TAIYO YUDEN, UMK212B7105KG-T
TDK, C2012X7R1H105K125AB
5 2 C48, C50 RES., AEC-Q200, 100Ω, 1%, 1/8W, 0805 VISHAY, CRCW0805100RFKEA
6 2 C49, C51 CAP., 47µF, X5R, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212BBJ476MG-T
TDK, C2012X5R0J476M125AC
TAIYO YUDEN, JMK212BJ476MG-T
7 1 C7 CAP., 1µF, X5R, 25V, 20%, 0603 AVX, 06033D105MAT2A
TAIYO YUDEN, TMK107BJ105MA-T
TDK, C1608X5R1E105M080AC
8 12 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6,
CIN7, CIN8, CIN9, CIN10, CIN11, CIN12
CAP., 22µF, X5R, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L
TAIYO YUDEN, TMK325BJ226KM-P
AVX, 12103D226KAT2A
TAIYO YUDEN, TMK325BJ226KM-T
9 2 CIN13, CIN14 CAP., 180µF, 30mΩ, ALUM. POLYMER, 16V,
20%, SMD
PANASONIC, 16SVP180MX
10 1 CITH1 CAP., 5600pF, COG, 50V, 5%, 0603 MURATA, GRM1885C1H562JA01D
11 2 CITHP1, CITHP2 CAP., 150pF, NP0, 50V, 5%, 0603 AVX, 06035A151JAT2A
12 6 COUT1, COUT3, COUT5, COUT7,
COUT9, COUT11
CAP., 220µF, X5R, 4V, 20%, 1206, NO SUBS.
ALLOWED
MURATA, GRM31CR60G227ME11L
13 18 COUT13, COUT14, COUT15, COUT16,
COUT17, COUT18, COUT19, COUT20,
COUT21, COUT22, COUT23, COUT24,
COUT25, COUT26, COUT27, COUT28,
COUT29, COUT30
CAP., 330µF, 9mΩ, ALUM. POLYMER, 2.5V,
20%, 7343, 6.3A
PANASONIC, EEFSX0E331ER
14 6 L1, L2, L3, L4, L5, L6 INDUCTOR, 0.25µH, 0.32mΩ WURTH ELEKTRONIK, 744301025
15 6 R19, R23, R38, R41, R66, R69 RES., 715Ω, 1%, 1/10W, 0603 NIC, NRC06F7150TRF
SAMSUNG, RC1608F7150CS
YAGEO, RC0603FR-07715RL
16 6 R20, R21, R22, R24, R25, R26 RES SMD, 2.32kΩ, 1%, 1/10W, 0603 VISHAY, CRCW06032K32FKEA
17 29 R3, R5, R7, R8, R11, R12, R14, R16,
R17, R18, R27, R29, R39, R40, R46,
R49, R67, R68, R77, R80, R81, R82,
R83, R105, R110, R113, R116, R119,
R122
RES., AEC-Q200, 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
NIC, NRC06ZOTRF
18 6 R1, R2, R33, R34, R54, R55 RES., COPPER, 0mΩ, JUMPER,2010 TEPRO OF FLORIDA, RN6083
PARTS LIST
13
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
19 4 R37, R50, R64, R76 RES., 10Ω, 1%, 1/10W, 0603 VISHAY
NIC
PANASONIC
Rohm
YAGEO
20 7 R4, R6, R28, R30, R42, R47, R48 RES., AEC-Q200, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA
21 1 R44 RES., 37.4kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060337K4FKEA
22 2 R72, R73 RES., AEC-Q200, 39.2kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060339K2FKEA
23 2 R78, R79 RES., AEC-Q200, 100kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA
NIC, NRC06F1003TRF
PANASONIC, ERJ3EKF1003V
24 17 R9, R10, R31, R32, R51, R52, R74,
R75, R92, R93, R96, R97, R101, R102,
RB1, RT1
RES., AEC-Q200, 10kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA
KOA SPEER, RK73H1JTTD1002F
PANASONIC, ERJ3EKF1002V
25 6 R94, R95, R99, R100, R103, R104 RES., 24.9kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060324K9FKEA
PANASONIC, ERJ3EKF2492V
26 1 RITH1 RES., 2.49kΩ, 1%, 1/10W, 0603 NIC, NRC06F2491TRF
VISHAY, CRCW06032K49FKEA
YAGEO, RC0603FR-072K49L
27 6 U1, U2, U3, U4, U5, U6 IC, SMAT POWER STAGE MODULE FAIRCHILD, FDMF5820DC
28 1 U7 IC,DUALOUTPUT 6-PHASE CONTROLLER,
GQFN-48 (5x6)
ANALOG DEVICES,
LTC7852ERHE#TRPBF
Dynamic Load Circuits
1 2 Q1, Q2 XSTR., N-CH, TRENCH MOSFET, 30V, 80A,
TO-263AB
FAIRCHILD SEMI, FDB8832
2 2 R85, R90 RES., AEC-Q200, 10kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA
KOA SPEER, RK73H1JTTD1002F
PANASONIC, ERJ3EKF1002V
3 2 R87, R91 RES., SENSE, 0.002Ω, 1%, 1W, 2512 VISHAY, WSL25122L000FEA
Bias Supply for DrMOS and LTC7852
1 1 C41 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104JAT4A
2 1 C40 CAP., 1µF, X7R, 50V, 10%, 0805 AVX, 08055C105KAT2A
TAIYO YUDEN, UMK212B7105KG-T
TDK, C2012X7R1H105K125AB
3 1 C42 CAP., 22µF, X5R, 6.3V, 20%, 0805 MURATA, GRM21BR60J226ME39L
SAMSUNG, CL21A226MQQNNNE
TDK, C2012X5R0J226M125AC
4 1 C43 CAP., 10µF, X5R, 6.3V, 10%, 0805 AVX, 08056D106KAT2A
KEMET, C0805C106K9PAC7800
KEMET, C0805C106K9PACTU
5 1 D1 DIODE, SCHOTTKY BARRIER RECTIFIER,
40V 500mA, SOD-323
NXP, PMEG4005AEA,115
6 1 L7 IND, 15µH, HIGH CURRENT LOW PROFILE SMD EATON, MP14020V2-150-R
7 1 R89 RES., AEC-Q200, 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
NIC, NRC06ZOTRF
8 1 R84 RES., AEC-Q200, 0Ω, 1/4W, 1206 VISHAY, CRCW12060000Z0EA
PANASONIC, ERJ8GEY0R00V
NIC, NRC12ZOTRF
14
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
9 1 R86 RES., 105kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603105KFKEA
NIC, NRC06F1053TRF
10 1 R88 RES., 20kΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF2002V
VISHAY, CRCW060320K0FKEA
YAGEO, RC0603FR-0720KL
11 1 U8 IC,1.1MHz/2.2MHz, 500mA STEP-DOWN
REGULATOR
3.3V Auxiliary Supply
1 1 C68 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
2 1 C69 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
3 1 C66 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867
KEMET, C0603C225K4PACTU
4 1 C67 CAP., 220pF, X7R, 50V, 5%, 0603 AVX, 06035C221JAT2A
5 1 R125 RES., AEC-Q200, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA
6 1 R127 RES., AEC-Q200, 100kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA
NIC, NRC06F1003TRF
7 1 R129 RES., AEC-Q200, 0Ω, 1/4W, 1206 VISHAY, CRCW12060000Z0EA
PANASONIC, ERJ8GEY0R00V
8 1 R126 RES., AEC-Q200, 1MΩ, 1%, 1/10W, 0603 VISHAY, CRCW06031M00FKEA
NIC, NRC06F1004TRF
9 1 R128 RES., AEC-Q200, 162kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603162KFKEA
PANASONIC, ERJ3EKF1623V
ROHM, MCR03EZPFX1623
10 1 U9 IC, LDO uPWR LINEAR REG., MSOP-8 ANALOG DEVICES, LT3010EMS8E#PBF
ANALOG DEVICES,
LT3010EMS8E#TRPBF
Additional Components
1 0 C26, C27, C38, C39, C52, C53, C54,
C55, C56, C57, C58, C59, C60, C61,
C62, C63, C64, C65, CITH2
CAP., OPTION, 0603
2 0 CIN15 CAP.,OPTION,ALUM. ELECT.,SMD
3 0 CIN16, CIN17, CIN18, CIN19, CIN20,
CIN21, CIN22, CIN23, CIN24, CIN25,
CIN26, CIN27"
CAP., OPTION, 1210
4 0 COUT2, COUT4, COUT6, COUT8,
COUT10, COUT12
CAP., OPTION, 1206
5 0 COUT31, COUT32, COUT33, COUT34,
COUT35, COUT36, COUT37, COUT38,
COUT39, COUT40, COUT41, COUT42,
COUT43, COUT44, COUT45,COUT46,
COUT47, COUT48
CAP., OPTION, 7343
PARTS LIST
15
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
6 0 R13, R15, R35, R36, R43, R45, R53,
R56, R57, R58, R59, R60, R61, R62,
R63, R65, R70, R71, R106, R107,
R108, R109, R111, R112, R114, R115,
R117, R118, R120, R121, R123, R124,
RB2, RT2, RITH2
RES., OPTION, 0603
Hardware
1 29 E1, E2, E3, E4, E5, E6, E7, E8, E9, E10,
E11, E12, E13, E14, E15, E16, E17, E18,
E19, E20, E21, E22, E23, E24, E25, E26,
E27, E28, E29
TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 6 J1, J2, J3, J4, J5, J6 STUD, FASTENER, #10-32 PENNENGINEERING, KFH-032-10ET
3 2 J7, J8 CONN., RF, BNC, RCPT JACK, 5-PIN, STR, THT,
50Ω
AMPHENOL RF, 112404
4 6 JLRE1, JLRE2, JLRE3, JLRE4, JLRE5,
JLRE6
"RING, LUG, CRIMP, #10, NON-INSULATED,
SOLDERLESS TERMINALS"
KEYSTONE, 8205
5 12 JNE1, JNE2, JNE3, JNE4, JNE5, JNE6,
JNE7, JNE8, JNE9, JNE10, JNE11,
JNE12
NUT, HEX, #10-32, BRASS PENCOM, NU1132
6 4 JP1, JP2, JP3, JP4 "CONN., HDR, MALE, 1x3 ,2mm, THT, STR,
NO SUBS. ALLOWED"
Wurth Elektronik, 62000311121
7 6 JWE1, JWE2, JWE3, JWE4, JWE5,
JWE6
WASHER, #10, LOCK, EXT, TIN FINISH PENCOM, WA4526
8 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.625" KEYSTONE, 8834
9 4 XJP1, XJP2, XJP3, XJP4 CONN., SHUNT, FEMALE, 2 POS, 2mm Wurth Elektronik, 60800213421
16
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
-B
Fsw = 400kHz
For conventional DCR sense
-A 1.0V / 100A 1.5V / 100A
-B 1.0V / 200A
VOUT1 VOUT2
-B
4PROD 06/26/18 `A fA
REVISION HISTORY
ECO REV DESCRIPTION APPROVEDDATE
ASSY
[1]
4.99k
RITH1
2.49k
CITH1
3.3nF
5.6nF
RITH2
7.50k
OPT
CITH2
OPT
2.2nF
RT2
OPT
20k
OPT
RB2
10k
[1] [1]
[1] [1]
[1] [1]
[2] RESISTORS SHALL BE INSTALLED AT LOCATIONS C48 AND C50.
SNSN6
SNSN6
SNSP6
SNSN5
SNSP5
SNSN4
SNSP4
ITH1 ITH2
VOSNS1+ VOSNS2+
VOS1- VOS2-
SS1 SS2
RUN1 RUN2
SNSP3
VOUT2
VOUT1VO2PH4
VO2PH4
VOS2+
VIN
SNSP2
VOS2-
VOUT1
SNSP1 SNSN1
VCC
5VBIAS
VCC
CLKOUT PLLIN
VCC
SNSP4
RUN1
SNSP5
VIN
SS1
RUN2
SS2
VIN
IMON1 IMON2
SS1 SS2
V1P5PGOOD1 PGOOD2
SNSP6
VCC VCC
VOS1+
VOS1-
SNSN2
SNSN1
SNSN3
SNSP1
SNSN4
SNSN2
SNSP2
SNSN5
SNSN3
SNSP3
VCC
VO2PH5
5VBIAS
PWM3
PWM2
5VBIAS
PWM1
5VBIAS
PWM4
5VBIAS
PWM5
5VBIAS
PWM6
5VBIAS
3.3VPLP
3.3VPLP 3.3VAUX
3.3V_VDD
3.3VPLP
3.3VPLP
3.3VPLP
3.3VPLP
3.3VPLP
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
Phone: (408)432-1900
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO.
IC NO.
ANALOG DEVICES 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 ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
12
` \
` f
LTC7852ERHE
HIGH EFFICIENCY 6 PHASE STEP-DOWN CONVERTER
DC2631A 710-DC2631A_REV04
N/A Tuesday, June 26, 2018
<Variant Name>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
Phone: (408)432-1900
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO.
IC NO.
ANALOG DEVICES 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 ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
12
` \
` f
LTC7852ERHE
HIGH EFFICIENCY 6 PHASE STEP-DOWN CONVERTER
DC2631A 710-DC2631A_REV04
N/A Tuesday, June 26, 2018
<Variant Name>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
Phone: (408)432-1900
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO.
IC NO.
ANALOG DEVICES 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 ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
12
` \
` f
LTC7852ERHE
HIGH EFFICIENCY 6 PHASE STEP-DOWN CONVERTER
DC2631A 710-DC2631A_REV04
N/A Tuesday, June 26, 2018
<Variant Name>
R7 0
+
COUT17
12
COUT5
220uF
4V
1206
E1
VIN+
U3
FDMF5820DC
PWM 1
ZCD# 2
VCC 3
AGND 32
NC 6
PHASE 7
VIN 8
VIN
11
PGND
12
PGND
13
PGND
14
PGND
15
SW
16
SW
17
SW
18
SW
19
SW
20
SW
21
SW
22
EN/FAULT# 31
SW
23
SW 24
SW 25
SW 26
GL 27
PGND 28
PVCC 29
TMON 30
BOOT 5
GL 33
AGND 4
VIN
10
VIN
9
R31
10k
1%
C19
2.2uF
C25
2.2uF
+
COUT19
330uF
7343
2.5V
12
R23
715
E2
VIN2-
COUT7
220uF
4V
1206
R119
0
R33
0 mOHM
U7
LTC7852ERHE
SNSP4
2
SNSN4
3
SNSAVG5
4
SNSP5
5
SNSN5
6
SNSAVG6
7
SNSP6
8
SNSN6
9
VDD 39
CLKOUT 40
VOSNS1- 26
PWM3 43
PWM2 42
PWM4 44
PWM5 45
PWM6 46
GND 48
PWM1 41
PHCFG
21
FREQ
22
ILIM1
23
RUN1
24
VOSNS1+ 25
SNSAVG4
1
PGOOD2
10
PLLIN 47
SNSAVG3 38
VCC
20
IMON1
19
GND
49
SS2
11
ITH2
12
VOSNS2-
13
VOSNS2+
14
RUN2
15
ILIM2
16
IMON2
17
V1P5
18
ITH1 27
SS1 28
PGOOD1 29
SNSN1 30
SNSP1 31
SNSAVG1 32
SNSN2 33
SNSP2 34
SNSAVG2 35
SNSN3 36
SNSP3 37
R8 0
R50 10
+
COUT26
12
R67
0
R122
0
R20
2.32k
E6
RUN1
C8
0.22uF
+
COUT13
330uF
2.5V
7343
12
R116
0
RT1 10k 1%
E14
PGOOD1
E3
VOS1+
R38
715
RB1 10k 1%
C33
2.2uF
R102
10k
1%
CIN2
22uF
CITH1
R96
10k
1%
CIN12
E9
CLKOUT
R73
39.2k
C34
0.22uF
C60
OPT
U2
FDMF5820DC
PWM 1
ZCD# 2
VCC 3
AGND 32
NC 6
PHASE 7
VIN 8
VIN
11
PGND
12
PGND
13
PGND
14
PGND
15
SW
16
SW
17
SW
18
SW
19
SW
20
SW
21
SW
22
EN/FAULT# 31
SW
23
SW 24
SW 25
SW 26
GL 27
PGND 28
PVCC 29
TMON 30
BOOT 5
GL 33
AGND 4
VIN
10
VIN
9
R39
0
R56
OPT
R2
0 mOHM
E13
PGOOD1
+
COUT27
12
J3
VOUT1
[1]
R81
0
R48 1
R71
OPT
C52
OPT
R16 0
C2
2.2uF
C54
OPT
C6
2.2uF
R44
37.4k
+
COUT25
330uF
2.5V
7343
12
+
CIN15
OPT
12
R21
2.32k
R45
OPT
R111
OPT
CIN1
1210
25V
COUT3
220uF
1206
4V
R76
10
CIN10
R19
715
J1 VIN
7V - 14V
R112
OPT
+
COUT29
12
C28
2.2uF
R13
OPT
E10
PLLIN
R82
0
R101
10k
1%
R66
715
JP2
ON
OFF
RUN1
1
3
2
R35
OPT
R49 0
J6
GND
C9
0.22uF
R40
0
E15
IMON1
CIN7
22uF
1210
25V
R114
OPT
C30
100nF
R27 0
C22
0.22uF
R74
10k
1%
R24
2.32k
TP7
+
COUT20
12
R42
1
CIN11
22uF
25V
1210
R83
0
R61
OPT
R115
OPT
C16
0.22uF
C7
1uF
C35
0.22uF
R6 1
E8
VOS2-
R3 0
R30 1
R72
39.2k
C4
0.22uF
+
COUT22
330uF
2.5V
12
R37 10
C18
2.2uF
C61
OPT
R121
OPT
TP8
E5
VOS2+
R14 0
R92
10k
1%
CIN8
R52
10k
1%
R58
OPT
CIN9
22uF
25V
1210
C1
2.2uF
R11 0
E17
1.5VREF4
E12
SS2
C10
0.22uF
+
COUT14
12
R41
715
+
CIN14
180uF
16V
12
C23
0.22uF
C15
0.22uF
TP10
C62
OPT
R25
2.32k
C38
OPT
R60
OPT
+
CIN13
180uF
16V
12
COUT11
220uF
4V
1206
+
COUT18
12
R47 1
U5
FDMF5820DC
PWM 1
ZCD# 2
VCC 3
AGND 32
NC 6
PHASE 7
VIN 8
VIN 11
PGND 12
PGND 13
PGND 14
PGND 15
SW
16
SW
17
SW
18
SW
19
SW
20
SW
21
SW
22
EN/FAULT#
31
SW
23
SW
24
SW
25
SW
26
GL
27
PGND
28
PVCC
29
TMON
30
BOOT 5
GL
33
AGND 4
VIN 10
VIN 9
R53
OPT
J4
GND
E4
VOS1-
+
COUT15
12
C31
100nF
C12
0.22uF
R46 0
R106
OPT
RITH2
R99
24.9k
1%
L3
0.25uH
744301025
1 2
R57
OPT
+
COUT24
12
R10
10k
1%
R77
0
R123
OPT
C27
OPT
R32
10k
1%
JP1
ON
OFF
RUN1
1
3
2
CITHP2 150pF
J2 GND
C29
2.2uF
R104
24.9k
1%
R79
100k
1%
R120
OPT
C56
OPT
R117
OPT
CFF2 OPT
R5 0
R124
OPT
COUT1
1206
4V
220uF
R1
0 mOHM
C20
0.22uF
C24
2.2uF
COUT9
220uF
4V
1206
L4
0.25uH
744301025
12
C59
OPT
+
COUT16
330uF
7343
2.5V
12
R80
0
R69
715
U6
FDMF5820DC
PWM 1
ZCD# 2
VCC 3
AGND 32
NC 6
PHASE 7
VIN 8
VIN 11
PGND 12
PGND 13
PGND 14
PGND 15
SW
16
SW
17
SW
18
SW
19
SW
20
SW
21
SW
22
EN/FAULT#
31
SW
23
SW
24
SW
25
SW
26
GL
27
PGND
28
PVCC
29
TMON
30
BOOT 5
GL
33
AGND 4
VIN 10
VIN 9
L1
0.25uH
744301025
1 2
R94
24.9k
1%
R36
OPT
L5
0.25uH
744301025
12
R43
OPT
C5
2.2uF
R59
OPT
C3
0.22uF
TP11
C26
OPT
R22
2.32k
C32
2.2uF
R118
OPT
+
COUT28
330uF
2.5V
7343
12
R95
24.9k
1%
C14
0.22uF
C55
OPT
J5
VOUT2
[1]
CIN4
R26
2.32k
R110
0
R12 0
C11
0.22uF
R15
OPT
R62
OPT
R17
0
R107
OPT
RB2
R113
0
+
COUT23
7343
12
C58
OPT
U4
FDMF5820DC
PWM 1
ZCD# 2
VCC 3
AGND 32
NC 6
PHASE 7
VIN 8
VIN 11
PGND 12
PGND 13
PGND 14
PGND 15
SW
16
SW
17
SW
18
SW
19
SW
20
SW
21
SW
22
EN/FAULT#
31
SW
23
SW
24
SW
25
SW
26
GL
27
PGND
28
PVCC
29
TMON
30
BOOT 5
GL
33
AGND 4
VIN 10
VIN 9
C65
OPT
R78
100k
1%
R51
10k
1%
R28 1
TP9
CIN6
25V
R103
24.9k
1%
C64
OPT
E11
SS1
R55
0 mOHM
R34
0 mOHM
E7
RUN2
CITHP1 150pF
R9
10k
1%
C17
0.22uF
R4 1
L6
0.25uH
744301025
12
R68
0
R97
10k
1%
C63
OPT
R63
OPT
R109
OPT
R100
24.9k
1%
RT2
C13
0.22uF
+
COUT21
12
C53
OPT
L2
0.25uH
744301025
1 2
R29 0
+
COUT30
12
C39
OPT
RITH1
CITH2
R65
OPT
R93
10k
1%
C37
2.2uF
C57
OPT
R54
0 mOHM
R64
10
CIN3
22uF
25V
1210
R18
0
R108
OPT
R75
10k
1%
C36
2.2uF
U1
FDMF5820DC
PWM 1
ZCD# 2
VCC 3
AGND 32
NC 6
PHASE 7
VIN 8
VIN
11
PGND
12
PGND
13
PGND
14
PGND
15
SW
16
SW
17
SW
18
SW
19
SW
20
SW
21
SW
22
EN/FAULT# 31
SW
23
SW 24
SW 25
SW 26
GL 27
PGND 28
PVCC 29
TMON 30
BOOT 5
GL 33
AGND 4
VIN
10
VIN
9
CFF1 OPT
R70
OPT
E16
IMON2
TP6
CIN5
22uF
1210
C21
0.22uF
R105
0
V1P5
SNSAVG6
SNSAVG5
SNSAVG4
IMON1
VOSNS2+
VOS2+ VOS2-
VOSNS1+
VOS1-
ITH2
VOS1+
ITH1
PWM1
PWM2
PWM3
PWM6
PWM5
PWM4
RUN2
SNSAVG1
SNSAVG2
SNSAVG3
SNSAVG4
SNSAVG5
SNSAVG6
CLKOUTPLLIN
IMON2
SNSAVG1
SNSAVG2
SNSAVG3
RUN1
PGOOD1
SS1
PGOOD2
SS2
3.3V_VDD
17
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
5% DUTY CYCLE MAX.
2mV / Amp
DYNAMIC LOAD CIRCUITS
5% DUTY CYCLE MAX.
2mV / Amp
BIAS SUPPLY FOR DrMOS and LTC7852
3.3V AUXILIARY SUPPLY
NOTE: PRE-LOAD RESISTORS ARE STUFFED AT C48 AND C50.
[2]
[2]
NOTE:
If external 5V bias is applied, remove R84 and place the 5VBIAS jumper in the OFF position.
Next, connect the external supply to the 5VBIAS turret and turn-on supply,
Do not hot plug.
NOTE:
If external 3.3V bias is applied, remove R129 and place the 3.3VAUX jumper in the OFF position.
Next, connect the external supply to the 3.3VAUX turret and turn-on supply,
Do not hot plug.
VOUT1
VOUT2
VOUT1 VOUT2
VIN
VIN
5VBIAS
VIN
VO2PH4 VO2PH5
5VBIAS
3.3VAUX
VIN
VOUT1
VOUT2
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
Phone: (408)432-1900
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO.
IC NO.
ANALOG DEVICES 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 ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
22
` \
` f
LTC7852ERHE
HIGH EFFICIENCY 6 PHASE STEP-DOWN CONVERTER
DC2631A 710-DC2631A_REV04
N/A Tuesday, June 26, 2018
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
Phone: (408)432-1900
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO.
IC NO.
ANALOG DEVICES 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 ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
22
` \
` f
LTC7852ERHE
HIGH EFFICIENCY 6 PHASE STEP-DOWN CONVERTER
DC2631A 710-DC2631A_REV04
N/A Tuesday, June 26, 2018
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
Phone: (408)432-1900
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO.
IC NO.
ANALOG DEVICES 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 ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
22
` \
` f
LTC7852ERHE
HIGH EFFICIENCY 6 PHASE STEP-DOWN CONVERTER
DC2631A 710-DC2631A_REV04
N/A Tuesday, June 26, 2018
+
COUT36
12
E28
3.3V/50mA
3.3VAUX
C50
100
1%
0805
J8
VOUT2
E24
PULSE GEN 2
+
COUT44
12
R129 0
1206
L7
15uH
E25
GND
R88
20k
+
COUT43
OPT
7343
12
C42
22uF
COUT8
OPT
1206
CIN16
OPT
1210
+
COUT32
12
+
COUT45
12
R127
100k
1%
C47
1uF
50V
0805
COUT10
OPT
1206
CIN19
OPT
1210
C46
1uF
50V
0805
R126
1M
C48
100
1%
0805
+
COUT35
12
E29
GND
COUT4
CIN18
OPT
1210
+
COUT46
OPT
7343
12
E22
ISTEP1+
JP3
ON
OFF
5VBIAS
1
3
2
+
COUT48
12
COUT12
OPT
1206
E18
PULSE GEN 1
R125
1
R91
0.002
1%
2512
CIN22
OPT
1210
C44
OPT
+
COUT34
OPT
7343
12
CIN17
OPT
1210
COUT6
CIN23
OPT
1210
+
COUT47
12
R86
105k
C51
47uF
0805
6.3V
E19
5.0V / 500mA
5VBIAS
CIN24
OPT
1210
COUT2
OPT
1206
CIN21
OPT
1210
R84 0
1206
C68
2.2uF
J7
VOUT1
+
COUT37
OPT
7343
12
R128
162k
D1
PMEG4005AEA
JP4
ON
OFF
3.3VAUX
1
3
2
CIN25
OPT
1210
CIN20
OPT
1210
+
COUT38
12
E26
ISTEP2+
R87
0.002
1%
2512
C49
47uF
0805
6.3V
CIN26
OPT
1210
R89
0
C43
10uF
U9
LT3010EMS8E
GND
4
SHDN
5
IN
8OUT 1
SENSE/ADJ 2
GND
9
NC
3
NC
6
NC
7
R90
10k
1%
E27
ISTEP2-
C40
1uF
+
COUT40
OPT
7343
12
CIN27
OPT
1210
C66
2.2uF
E20
GND
C41
100nF
+
COUT41
12
E23
ISTEP1-
+
COUT39
12
E21
GND
+
COUT31
OPT
7343
12
C67
220pF
C45
OPT
U8
LT3502EDC
VIN
1
BD
2
FB
3
SHDN
4GND 5
DA 6
BOOST 7
SW 8
9
GND
Q1
FDB8832
+
COUT42
12
R85
10k
1%
Q2
FDB8832
+
COUT33
12
C69
2.2uF
18
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
ANALOG DEVICES, INC. 2019
06/19
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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