DC2380A - Demo Manual

DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
LTC7851
High Output Current 4-Phase
Step-Down Converter
Description
Demonstration circuit DC2380A features the LTC®7851,
a high performance 4-phase voltage mode controller, in
the following high output current step-down converters:
DC2380A-A: 1.8V/30A, 1.5V/30A, 1.2V/30A and 1.0V/30A
DC2380A-B: 1.8V/60A Dual Phase and 1.2V/60A Dual Phase
These demo boards use a high density, two sided layout
which places the power stage on the top and the control
circuit on the bottom. The LTC7851 and DrMOS are biased
by an onboard LT3970 buck converter.
Additional features of this demo board include:
Remote Sensing
DC2380A-C: 1.2V/120A 4-Phase
n
The above converters provide a maximum per phase
current of 30A while operating at a frequency of 400kHz
over an input voltage range of 7V to 14V. The power
stage of each phase consists of a 5mm × 5mm DrMOS
and 0.25µH/0.325mΩ inductors. The PWM outputs of the
LTC7851 drive each DrMOS and DCR sensing is employed
to sense the inductor current. The LTC7851’s integrated
current share circuit provides highly accurate current
sharing in the DC2380A-B and DC2380A-C converters.
n
CLKIN and CLKOUT Pins
PGOOD, RUN and TRACK/SS Pins
n
Dynamic Load Circuit
n
The LTC7851 data sheet provide a complete description
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 at
http://www.linear.com/demo/DC2380A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Performance Summary
Specifications are at TA = 25°C
Table 1. DC2380A-A – No Air Flow Rating
PARAMETER
CONDITION
VALUE
Minimum Input Voltage
7V
Maximum Input Voltage
14V
Output Voltage VOUT1
IOUT1 = 0A to 30A, VIN = 7V to 14V
1.8V ± 2%
Output Voltage VOUT2
IOUT2 = 0A to 30A, VIN = 7V to 14V
1.5V ± 2%
Output Voltage VOUT3
IOUT3 = 0A to 30A, VIN = 7V to 14V
1.2V ± 2%
Output Voltage VOUT4
IOUT4 = 0A to 30A, VIN = 7V to 14V
1.0V ± 2%
IOUT(MAX) for VOUT1-VOUT4
VIN = 7V to 14V
Nominal Switching Frequency
Efficiency (see Figure 4)
30A
400kHz
VOUT1 = 1.8V, IOUT1 = 30A, VIN = 12V
93.5% Typical
VOUT2 = 1.5V, IOUT2 = 30A, VIN = 12V
92.7% Typical
VOUT3 = 1.2V, IOUT3 = 30A, VIN = 12V
91.7% Typical
VOUT4 = 1.0V, IOUT4 = 30A, VIN = 12V
90.5% Typical
dc2380af
1
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Performance Summary
Specifications are at TA = 25°C
Table 2. DC2380A-B – No Air Flow Rating
PARAMETER
CONDITION
VALUE
Minimum Input Voltage
7V
Maximum Input Voltage
14V
Output Voltage VOUT1
(Phases 1 and 2 Paralleled)
IOUT1 = 0A to 60A, VIN = 7V to 14V
1.8V ± 2%
Output Voltage VOUT3
(Phases 3 and 4 Paralleled)
IOUT3 = 0A to 60A, VIN = 7V to 14V
1.2V ± 2%
IOUT(MAX) for VOUT1 and VOUT3
VIN = 7V to 14V
Nominal Switching Frequency
Efficiency (see Figure 5)
60A
400kHz
VOUT1 = 1.8V, IOUT1 = 60A, VIN = 12V
93.9%
VOUT3 = 1.2V, IOUT3 = 60A, VIN = 12V
92.1%
CONDITION
VALUE
Table 3. DC2380A-C – No Air Flow Rating
PARAMETER
Minimum Input Voltage
7V
Maximum Input Voltage
14V
Output Voltage VOUT1
(Phases 1-4 Paralleled)
IOUT1 = 0A to 120A, VIN = 7V to 14V
IOUT(MAX) for VOUT1
VIN = 7V to 14V
Nominal Switching Frequency
Efficiency (see Figure 6)
2
1.2V ± 2%
120A
400kHz
VOUT1 = 1.2V, IOUT1 = 120A, VIN = 12V
91.7%
dc2380af
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Quick Start Procedure
The evaluation setup for DC2380 is straight forward. First,
refer to the respective setup drawings listed below:
-A converter: Figure 1
-B converter: Figure 2
-C converter: Figure 3
Next, follow the procedure below:
1)With power off, connect the input supply, load and
meters as shown in the setup drawings. Preset the load
to 0A and VIN supply to be 0V.
2)Place the RUN jumper(s) in the ON position.
3)Place the 5V BIAS jumper in the ON position.
1)Connect the output under test to the correct dynamic
load circuit:
a)For VOUT1, stuff copper jumper at R89 and remove
jumper from R90.
b)For VOUT2, stuff copper jumper at R90 and remove
jumper from R89.
c)For VOUT3, stuff copper jumper at R101 and remove
jumper at R102.
d)For VOUT4, stuff copper jumper at R102 and remove
jumper at R101.
2)Apply signal from the pulse generator.
4)Set the input voltage to 12V.
a)Connect the output of the pulse generator between
PULSE GEN A and GND for VOUT1 or VOUT2.
5)Check the output voltage. The output voltage should be
within the regulation limits shown in the Performance
Summary table.
b)Connect the output of the pulse generator between
PULSE GEN B and GND for VOUT3 or VOUT4.
6)Next, apply full load and re-measure VOUT. Check the
output voltage again to make sure it is within the regulation limits.
7)Adjust the input voltage and load current to the desired
levels within their limits and observe the regulation,
output ripple, load step response, efficiency and other
parameters.
Air Flow Requirements
The DC2380A-A/-B/-C can operate will full load on all outputs with no air flow at room temperature. But for ambient
temperatures of 35°C or higher, apply 200LFM or more.
Dynamic Load Circuit (Optional)
Demonstration circuit 2380A provides two simple dynamic
load circuits consisting of a MOSFET and sense resistor.
Circuit A is for VOUT1 and VOUT2 and circuit B is for VOUT3
and VOUT4. To apply a load step, follow the steps below.
3)Preset the amplitude of a pulse generator to 0.0V and
the duty cycle to 5% or less.
4)Monitor the load step current. Depending on which
output is being tested, connect a scope probe between
ISTEPA+ and ISTEPA– or between ISTEPB+ and ISTEPB–.
5)With the converter running, slowly increase the amplitude of the pulse generator output to provide the
desired load step pulse height. The scaling for the load
step signals is 2mV / Amp.
Note 1: To monitor the output voltage ripple, use the BNC
connectors labeled VOUT1, VOUT2, VOUT3 and VOUT4.
Note 2: Do not connect load between the VOS+ and VOS–
turrets. This could damage the converter. Only apply load
across the VOUT+ and VOUT– stud connectors on the edge
of the board.
dc2380af
3
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Quick Start Procedure
VOUT1*
+
–
IOUT1
+
VOUT1
LOAD
–
IOUT2
IIN
+
–
VIN
SUPPLY
+
–
VOUT2*
+
VOUT2
LOAD
–
+
VIN
–
IOUT3
+
–
VOUT3*
+
VOUT3
LOAD
–
IOUT4
+
VOUT4
LOAD
–
+
–
VOUT4*
Figure 1. Proper Measurement Equipment Setup for the Four Outputs Converter (-A)
VOUT1*
–
+
IOUT1
+
VOUT1
LOAD
–
IIN
VIN
SUPPLY
+
–
+
VIN
–
IOUT3
+
–
VOUT3*
+
VOUT3
LOAD
–
Figure 2. Proper Measurement Equipment Setup for the Two Dual Phase Outputs Converter (-B)
4
dc2380af
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Quick Start Procedure
VOUT1*
–
+
IOUT1
+
VOUT1
LOAD
–
IIN
VIN
SUPPLY
+
–
+
VIN
–
Figure 3. Proper Measurement Equipment Setup for the Single Output 4-Phase Converter (-C)
dc2380af
5
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
100
100
95
95
90
90
EFFICIENCY (%)
EFFICIENCY (%)
Quick Start Procedure
85
80
1.8V/30A
1.5V/30A
1.2V/30A
1.0V/30A
75
70
0
5
10
15
20
LOAD CURRENT(A)
25
85
80
75
70
30
1.8V/60A DUAL PHASE
1.2V/60A DUAL PHASE
0
10
20
30
40
LOAD CURRENT(A)
50
60
DC2380A F04
DC2380A F04
CONDITIONS:
VIN = 12V
fSW = 400kHz
L = WURTH 744301025 (0.25µH, 0.325mΩ), EACH PHASE
DrMOS = FDMF5820DC, EACH PHASE
EXTERNAL 5V BIAS APPLIED (EFF. INCLUDES BIAS POWER)
ONE RAIL ENABLED AT A TIME
CONDITIONS:
VIN = 12V
fSW = 400kHz
EACH RAIL IS SINGLE PHASE
L = WURTH 744301025 (0.25µH, 0.325mΩ), EACH PHASE
DrMOS = FDMF5820DC, EACH PHASE
EXTERNAL 5V BIAS APPLIED (EFF. INCLUDES BIAS POWER)
ONE RAIL ENABLED AT A TIME
Figure 4. Efficiency Curves for the -A Converter at 12VIN
Figure 5. Efficiency Curves for the -B Converter at 12VIN
100
EFFICIENCY (%)
95
90
85
80
7VIN
12VIN
14VIN
75
70
0
20
40
60
80
LOAD CURRENT(A)
100
120
DC2380A F06
CONDITIONS:
VIN = 12V
fSW = 400kHz
L = WURTH 744301025 (0.25µH, 0.325mΩ), EACH PHASE
DrMOS = FDMF5820DC, EACH PHASE
EXTERNAL 5V BIAS APPLIED (EFF. INCLUDES BIAS POWER)
ONE RAIL ENABLED AT A TIME
Figure 6. Efficiency Curves for the -C Converter
Over the Input Voltage Range
6
dc2380af
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Quick Start Procedure
VP-P = 88mV
VP-P = 77mV
1.8VOUT (AC)
50mV/DIV
1.5VOUT (AC)
50mV/DIV
30A
LOAD STEP
5A/DIV
30A
22.5A
LOAD STEP
5A/DIV
20µs/DIV
22.5A
DC2380A F07a
20µs/DIV
COUT: 3× 330µF, 2.5V, 9mΩ
2× 100µF, 6.3V, X5R, 1206
L: 0.25µH
fSW: 400kHz
(a)
(b)
VP-P = 66mV
VP-P = 66mV
1.2VOUT (AC)
50mV/DIV
1.0VOUT (AC)
50mV/DIV
30A
LOAD STEP
5A/DIV
DC2380A F07b
COUT: 3× 330µF, 2.5V, 9mΩ
2× 100µF, 6.3V, X5R, 1206
L: 0.25µH
fSW: 400kHz
30A
22.5A
LOAD STEP
5A/DIV
20µs/DIV
COUT: 3× 330µF, 2.5V, 9mΩ
2× 100µF, 6.3V, X5R, 1206
L: 0.25µH
fSW: 400kHz
DC2380A F07c
22.5A
20µs/DIV
DC2380A F07d
COUT: 3× 330µF, 2.5V, 9mΩ
2× 100µF, 6.3V, X5R, 1206
L: 0.25µH
fSW: 400kHz
(c)
(d)
Figure 7. 75% to 100% Load Step Response of the -A Converter
dc2380af
7
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Quick Start Procedure
VP-P = 56mV
VP-P = 45mV
1.8VOUT (AC)
50mV/DIV
1.2VOUT (AC)
50mV/DIV
60A
LOAD STEP
10A/DIV
60A
45A
LOAD STEP
10A/DIV
45A
DC2380A F08a
20µs/DIV
20µs/DIV
DUAL PHASE
COUT: 6× 330µF, 2.5V, 9mΩ
4× 100µF, 6.3V, X5R, 1206
L: 0.25µH
DC2380A F08b
DUAL PHASE
COUT: 6× 330µF, 2.5V, 9mΩ
4× 100µF, 6.3V, X5R, 1206
L: 0.25µH
(a)
(b)
Figure 8. 75% to 100% Load Step Response of the -B Converter
VP-P = 59mV
1.2VOUT (AC)
50mV/DIV
120A
LOAD STEP
20A/DIV
90A
20µs/DIV
DC2380A F09
4-PHASE
COUT: 12× 330µF, 2.5V, 9mΩ
8× 100µF, 6.3V, X5R, 1206
L: 0.25µH
Figure 9. 75% to 100% Load Step Response of the -C Converter
8
dc2380af
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2380A-A
Required Circuit Components
1
8
C1,C4,C7,C10,C21,C27,C30,C34
CAP, 2.2µF, X7R, 16V, 10%, 0603
MURATA, GRM188R61C225KE15D
2
2
C1-1, C1-2
CAP, 2200pF, X7R, 50V, 10%, 0603
AVX, 06035C222KAT2A
3
1
C18
CAP, 1µF, X5R, 16V, 10%, 0603
AVX, 0603YD105KAT2A
4
8
C2,C8,C13,C14,C22,C23,C24,C31
CAP, 0.22µF, X7R, 16V, 10%, 0603
AVX, 0603YC224KAT2A
5
4
C2-1, C2-2,C2-3,C2-4
CAP, 100pF, NP0, 25V, 10%, 0603
AVX,06033A101KAT2A
6
6
C3-1,C3-2,C3-3,C3-4, C1-3,C1-4
CAP, 3300pF, X7R, 50V, 10%, 0603
AVX, 06035C332KAT2A
7
4
C5,C12,C28,C33
CAP, 10µF, X5R, 35V, 20%, 0805
TDK., C2012X5R1V106M085AC
8
2
CIN1,CIN2
CAP, 180µF, 30mΩ, 3.02A, 16V
SANYO 16SVP180MX
9
8
CIN3-CIN10
CAP, 22µF, X5R, 25V, 10%, 1210
MURATA GRM32ER71E226K
10
8
COUT1, COUT2, COUT6, COUT7, COUT11,
COUT12, COUT16, COUT17
CAP, 100µF, X5R, 6.3V, 20%, 1206
MURATA GRM31CR60J107M
11
12
COUT3-COUT5, COUT8-COUT10, COUT13COUT15, COUT18-COUT20
CAP, 330µF, 2.5V, 7343
PANASONIC, EEFSX0E331ER
12
4
L1, L2, L3, L4
IND, 0.25µH, DCR = 0.325mΩ
WURTH ELEKTRONIK 744301025
13
5
R1, R40, R54, R59, R75
RES, 1Ω, 1/10W, 1%, 0603
VISHAY, CRCW06031R00FKED
14
1
R15
RES, 18.2k, 1/10W, 1%, 0603
VISHAY, CRCW060318K2FKEA
15
13
R2, R3, R34, R41, R42, R47, R56, R60, R62, R73, RES, 0, 1/10W, 0603
R76, R79, R88
VISHAY, CRCW06030000Z0EA
16
1
R2-1
RES, 5.62k, 1/10W, 1%, 0603
VISHAY, CRCW06035K62FKEA
17
1
R2-2
RES, 4.75k, 1/10W, 1%, 0603
VISHAY, CRCW06034K75FKEA
18
1
R2-3
RES, 3.48k, 1/10W, 1%, 0603
VISHAY, CRCW06033K48FKEA
19
1
R2-4
RES, 3.32k, 1/10W, 1%, 0603
VISHAY, CRCW06033K32FKEA
20
4
R28, R52, R70, R86
RES, 24.9k, 1/10W, 1%, 0603
VISHAY, CRCW060324K9FKEA
21
5
R29, R39, R53, R71, R77
RES, 10Ω, 1/10W, 1%, 0603
VISHAY, CRCW060310R0FKED
22
4
R30, R50, R68, R83
RES, 100k, 1/10W, 1%, 0603
VISHAY, CRCW0603100KFKEA
23
4
R3-1, R3-2, R3-3, R3-4
RES, 332Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603332RFKEA
24
4
R38, R55, R72, R87
RES, 3.57k, 1/10W, 1%, 0603
VISHAY, CRCW06033K57FKEA
25
3
R43 , R63, R78
RES, 18.2k, 1/10W, 1%, 0603
VISHAY, CRCW060318K2FKEA
26
1
R44
RES, 30.9k, 1/10W, 1%, 0603
VISHAY, CRCW060330K9FKEA
27
1
R51
RES, 43.2k, 1/10W, 1%, 0603
VISHAY, CRCW060343K2FKEA
28
3
R58, R85, R74
RES, 10Ω, 1/10W, 1%, 0603
VISHAY, CRCW060310R0FKED
29
3
R69, R57, R61
RES, 43.2k, 1/10W, 1%, 0603
VISHAY, CRCW060343K2FKEA
30
21
RB-1, RB-2, RB-3, RT-3, RT-4, R1-2, R1-3, R1-4,
R81, R84, R1-1, R7, R11, R20, R45, R46, R49,
R64, R65, R67, R80
RES, 10k, 1/10W, 1%, 0603
VISHAY, CRCW060310K0FKEA
31
1
RT-1
RES, 20k, 1/10W, 1%, 0603
VISHAY, CRCW060320K0FKEA
32
2
RT-2, RB-4
RES, 15k, 1/10W, 1%, 0603
VISHAY, CRCW060315K0FKEA
33
1
U1
IC, LTC7851EUHH#PBF, QFN, 5mm × 9mm
LINEAR TECH., LTC7851EUHH#PBF
34
4
U2, U3, U4, U5
IC, HIGH FREQUENCY DRMOS
FAIRCHILD, FDMF5820DC
dc2380af
9
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1
0
C25, C26, C29, C32, C3, C6, C9, C15, C16, C17,
C19, C11, C20
CAP, OPTIONAL, 0603
2
0
COUT21-COUT23, COUT27-COUT29, COUT33COUT35, COUT39-COUT41
CAP, OPTIONAL, 7343
3
0
R31, R32, R33, R35, R36, R37
RES, OPTIONAL, 2512
4
0
R4-R6, R8-R10, R12-R14, R16-R19, R21-R24,
R25-R27, R48, R66, R82, R90, R96, R99, R100,
R102, R105, R106-R108
RES, OPTIONAL, 0603
Hardware: For Demo Board Only
1
30
E1-E30
TEST POINT, TURRET, .094" MTG. HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
2
4
J11, J12, J14, J15
CONN., BNC PC MOUNT
CONNEX, 112404
3
10
J1-J10
STUD, TESTPIN
PEM KFH-032-10
4
10
J1-J10
RING, LUG #10
KEYSTONE, 8205, #10
5
10
J1-J10
WASHER, TIN PLATED BRASS
ANY #10, #10EXT BZ TN
6
20
J1-J10 X 2
NUT, BRASS 10-32
ANY #10-32
7
5
JP1-JP5
CONN, HEADER, 1×3, 2mm
WURTH ELEKTRONIK, 62000311121
8
5
JP1-JP5
SHUNT, 2mm
WURTH ELEKTRONIK, 60800213421
9
4
MT1, MT2, MT3, MT4
STANDOFF, NYLON, SNAP-ON, 0.500"
WURTH ELEKTRONIK, 702936000
DC2380A-B
Required Circuit Components
1
8
C1, C4, C7, C10, C21, C27, C30, C34
CAP, 2.2µF, X7R, 16V, 10%, 0603
MURATA, GRM188R61C225KE15D
2
1
C1-1
CAP, 1500pF, X7R, 50V, 10%, 0603
AVX, 06035C152KAT2A
3
1
C1-3
CAP, 2200pF, X7R, 50V, 10%, 0603
AVX, 06035C222KAT2A
4
1
C18
CAP, 1µF, X5R, 16V, 10%, 0603
AVX, 0603YD105KAT2A
5
8
C2, C8, C13, C14, C22, C23, C24, C31
CAP, 0.22µF, X7R, 16V, 10%, 0603
AVX, 0603YC224KAT2A
6
4
C2-1, C2-3, C11, C20
CAP, 100pF, NP0, 25V, 10%, 0603
AVX,06033A101KAT2A
7
2
C3-1, C3-3
CAP, 3300pF, X7R, 50V, 10%, 0603
AVX, 06035C332KAT2A
8
4
C5, C12, C28, C33
CAP, 10µF, X5R, 35V, 20%, 0805
TDK., C2012X5R1V106M085AC
9
2
CIN1, CIN2
CAP, 180µF, 30mΩ, 3.02A, 16V
SANYO 16SVP180MX
10
8
CIN3-CIN10
CAP, 22µF, X5R, 25V, 10%, 1210
MURATA GRM32ER71E226K
11
8
COUT1, COUT2, COUT6, COUT7, COUT11,
COUT12, COUT16, COUT17
CAP, 100µF, X5R, 6.3V, 20%, 1206
MURATA GRM31CR60J107M
12
12
COUT3-COUT5, COUT8-COUT10, COUT13COUT15, COUT18-COUT20
CAP, 330µF, 2.5V, 7343
PANASONIC, EEFSX0E331ER
13
4
L1, L2, L3, L4
IND, 0.25µH, DCR = 0.325mΩ
WURTH ELEKTRONIK, 744301025
14
5
R1, R40, R54, R59, R75
RES, 1 OHM, 1/10W, 1%, 0603
VISHAY, CRCW06031R00FKED
15
1
R15
RES, 18.2k, 1/10W, 1%, 0603
VISHAY, CRCW060318K2FKEA
16
27
R2, R3, R4, R6, R10, R12, R14, R16, R18, R21,
R22, R24, R25, R27, R34, R41, R42, R47, R56,
R60, R62,R73, R76, R79, R88, R106, R108
RES, 0, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
17
1
R2-1
RES, 6.98K, 1/10W, 1%, 0603
VISHAY, CRCW06036K98FKEA
18
1
R2-3
RES, 4.99K, 1/10W, 1%, 0603
VISHAY, CRCW06034K99FKEA
19
4
R28, R52, R70, R86
RES, 24.9K, 1/10W, 1%, 0603
VISHAY, CRCW060324K9FKEA
10
dc2380af
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
20
5
R29, R39, R53, R71, R77
RES, 10 OHM, 1/10W, 1%, 0603
VISHAY, CRCW060310R0FKED
21
4
R30, R50, R68, R83
RES, 100K, 1/10W, 1%, 0603
VISHAY, CRCW0603100KFKEA
22
2
R3-1, R3-3
RES, 332Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603332RFKEA
23
4
R31, R33, R35, R37
RES, JUMPER, 0mΩ, 1W, 2512
TEPRO, RN5326
24
4
R38, R55, R72, R87
RES, 3.57K, 1/10W, 1%, 0603
VISHAY, CRCW06033K57FKEA
25
1
R44
RES, 30.9K, 1/10W, 1%, 0603
VISHAY, CRCW060330K9FKEA
26
2
R51, R61
RES, 43.2K, 1/10W, 1%, 0603
VISHAY, CRCW060343K2FKEA
27
1
R63
RES, 18.2K, 1/10W, 1%, 0603
VISHAY, CRCW060318K2FKEA
28
1
R74
RES, 10Ω, 1/10W, 1%, 0603
VISHAY, CRCW060310R0FKED
29
18
RB-1, R1-1, RT-3, RB-3, R1-3, R81, R84, R7, R11, RES, 10K, 1/10W, 1%, 0603
R20, R45, R46, R49, R64, R65, R67, R80, R65
VISHAY, CRCW060310K0FKEA
30
1
RT-1
RES, 20K, 1/10W, 1%, 0603
VISHAY, CRCW060320K0FKEA
31
1
U1
IC, LTC7851EUHH#PBF, QFN, 5mm × 9mm
LINEAR TECH., LTC7851EUHH#PBF
32
4
U2, U3, U4, U5
IC, HIGH FREQUENCY DRMOS
FAIRCHILD, FDMF5820DC
Additional Demo Board Circuit Components
1
0
C1-2, C2-2, C3-2, C2-4, C1-4, C3-4, C3, C6, C9,
C15, C16, C17, C19, C25, C26, C29, C32
CAP, OPTIONAL 0603
2
0
COUT21-COUT23, COUT27-COUT29, COUT33COUT35, COUT39-COUT41
CAP, OPTIONAL 7343
3
0
RT-2, RB-2, R1-2, R2-2, R3-2, RT-4, RB-4, R1-4,
R2-4, R3-4, R5, R8, R9, R13, R17, R19, R23,
R26, R43, R46, R48, R57, R58, R66, R69, R78,
R81, R82, R85, R90, R96, R99, R100, R102,
R105, R107
RES, OPTIONAL 0603
4
0
E11, E12, E18, E20
HARDWARE, OPTIONAL
5
0
JP2, JP4
HARDWARE, OPTIONAL
Hardware: For Demo Board Only
1
26
E1-E10, E13-E17, E19, E21-E30
TEST POINT, TURRET, .094" MTG. HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
2
4
J11, J12, J14, J15
CONN., BNC PC MOUNT
CONNEX, 112404
3
10
J1-J10
STUD, TESTPIN
PEM KFH-032-10
4
10
J1-J10
RING, LUG #10
KEYSTONE, 8205, #10
5
10
J1-J10
WASHER, TIN PLATED BRASS
ANY #10, #10EXT BZ TN
6
20
J1-J10 X 2
NUT, BRASS 10-32
ANY #10-32
7
3
JP1, JP3, JP5
CONN, HEADER, 1×3, 2mm
WURTH ELEKTRONIK 62000311121
8
3
JP1, JP3, JP5
SHUNT, 2mm
WURTH ELEKTRONIK 60800213421
9
4
MT1, MT2, MT3, MT4
STANDOFF, NYLON, SNAP-ON, 0.500"
WURTH ELEKTRONIK 702936000
DC2380A-C
Required Circuit Components
1
8
C1, C4, C7, C10, C21, C27, C30, C34
CAP, 2.2µF, X7R, 16V, 10%, 0603
MURATA, GRM188R61C225KE15D
2
1
C11
CAP, 100pF, NP0, 25V, 10%, 0603
AVX,06033A101KAT2A
3
1
C18
CAP, 1µF, X5R, 16V, 10%, 0603
AVX, 0603YD105KAT2A
4
8
C2, C8, C13, C14, C22, C23, C24, C31
CAP, 0.22µF, X7R, 16V, 10%, 0603
AVX, 0603YC224KAT2A
5
1
C2-1
CAP, 220pF, NP0, 25V, 10%, 0603
AVX,06033A221KAT2A
dc2380af
11
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
6
1
C1-1
CAP, 2200pF, X7R, 50V, 10%, 0603
AVX, 06035C222KAT2A
7
1
C3-1
CAP, 3300pF, X7R, 50V, 10%, 0603
AVX, 06035C332KAT2A
8
4
C5, C12, C28, C33
CAP, 10µF, X5R, 35V, 20%, 0805
TDK., C2012X5R1V106M085AC
9
2
CIN1, CIN2
CAP, 180µF, 30mΩ, 3.02A, 16V
SANYO 16SVP180MX
10
8
CIN3-CIN10
CAP, 22µF, X5R, 25V, 10%, 1210
MURATA GRM32ER71E226K
11
8
COUT1, COUT2, COUT6, COUT7, COUT11,
COUT12, COUT16, COUT17
CAP, 100µF, X5R, 6.3V, 20%, 1206
MURATA GRM31CR60J107M
12
12
COUT3-COUT5, COUT8-COUT10, COUT13COUT15, COUT18-COUT20
CAP, 330µF, 2.5V, 7343
PANASONIC, EEFSX0E331ER
13
4
L1, L2, L3, L4
IND, 0.25µH, DCR = 0.325mΩ
WURTH ELEKTRONIK 744301025
14
5
R1, R40, R54, R59, R75
RES, 1Ω, 1/10W, 1%, 0603
VISHAY, CRCW06031R00FKED
15
1
R15
RES, 18.2k, 1/10W, 1%, 0603
VISHAY, CRCW060318K2FKEA
16
34
R2, R3, R4-R6, R10, R12-R14, R16-R19, R21,
R22-R27, R34, R41, R42, R47, R56, R60, R62,
R73, R76, R79, R88, R106-R108
RES, 0Ω, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
17
1
R2-1
RES., 4.12k, 1/10W, 1%, 0603
VISHAY, CRCW06034K12FKEA
18
4
R28, R52, R70, R86
RES, 24.9k, 1/10W, 1%, 0603
VISHAY, CRCW060324K9FKEA
19
5
R29, R39, R53, R71, R77
RES, 10Ω, 1/10W, 1%, 0603
VISHAY, CRCW060310R0FKED
20
4
R30, R50, R68, R83
RES, 100k, 1/10W, 1%, 0603
VISHAY, CRCW0603100KFKEA
21
1
R3-1
RES, 332Ω, 1/10W, 1%, 0603
VISHAY, CRCW0603332RFKEA
22
6
R31, R32, R33, R35, R36, R37
RES, JUMPER, 0mΩ, 1W, 2512
TEPRO, RN5326
23
4
R38, R55, R72, R87
RES, 3.57k, 1/10W, 1%, 0603
VISHAY, CRCW06033K57FKEA
24
1
R44
RES, 30.9k, 1/10W, 1%, 0603
VISHAY, CRCW060330K9FKEA
25
1
R51
RES, 43.2k, 1/10W, 1%, 0603
VISHAY, CRCW060343K2FKEA
26
15
RT-1, RB-1, R1-1, R81, R84, R7, R11, R20, R45,
R46, R49, R64, R65, R67, R80
RES, 10k, 1/10W, 1%, 0603
VISHAY, CRCW060310K0FKEA
27
1
U1
IC, LTC7851EUHH#PBF, QFN, 5mm × 9mm
LINEAR TECH., LTC7851EUHH#PBF
28
4
U2, U3, U4, U5
IC, HIGH FREQUENCY DRMOS
FAIRCHILD, FDMF5820DC
Additional Demo Board Circuit Components
1
0
C1-2, C2-2,C3-2, C1-3,C2-3, C3-3, C1-4,C2-4,
C3-4, C20, C3, C6, C9, C15, C16, C17, C19, C25,
C26, C29, C32
CAP, OPTIONAL 0603
2
0
RT-2, RB-2, R1-2, R2-2, R3-2, RT-3, RB-3, R1-3,
R2-3, R3-3, RT-4, RB-4, R1-4, R2-4, R3-4, R8,
R9, R43, R46, R48, R57, R58, R61, R63, R65,
R66, R74, R78, R85, R82, R69, R90, R96, R99,
R100, R102, R105
RES, OPTIONAL 0603
3
0
COUT21-COUT23, COUT27-COUT29, COUT33COUT35, COUT39-COUT41
CAP, OPTIONAL 7343
4
0
E11, E12, E15, E16, E18, E20
HARDWARE, OPTIONAL
5
0
JP2-JP4
HARDWARE, OPTIONAL
Hardware: For Demo Board Only
1
24
E1-E10, E13, E14, E17, E19, E21-E30
TEST POINT, TURRET, .094" MTG. HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
2
4
J11, J12, J14, J15
CONN., BNC PC MOUNT
CONNEX, 112404
3
10
J1-J10
STUD, TESTPIN
PEM KFH-032-10
12
dc2380af
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
4
10
J1-J10
RING, LUG #10
KEYSTONE, 8205, #10
5
10
J1-J10
WASHER, TIN PLATED BRASS
ANY #10, #10EXT BZ TN
6
20
J1-J10 X 2
NUT, BRASS 10-32
ANY #10-32
7
2
JP1, JP5
CONN, HEADER, 1×3, 2mm
WURTH ELEKTRONIK 62000311121
8
2
JP1, JP5
SHUNT, 2mm
WURTH ELEKTRONIK 60800213421
9
4
MT1, MT2, MT3, MT4
STANDOFF, NYLON, SNAP-ON, 0.500"
WURTH ELEKTRONIK 702936000
DC2380A-A / DC2380A-B/DC2380A-C
Dynamic Load Circuits
1
2
Q1, Q3
MOSFET N-CHANNEL 20V (D-S)
VISHAY SUM60N02-3M9P-E3
2
2
R95, R104
RES, SENSE, 0.002Ω, 1W, 2512
VISHAY,WSL25122L000FEA
3
2
R93, R103
RES., 10k, 1/10W, 1%, 0603
VISHAY, CRCW060310K0FKEA
4
2
R89, R101
RES, JUMPER, 0mΩ, 1W, 2512
TEPRO, RN5326
Bias Supply
1
1
L5
INDUCTOR, 22µH
SUMIDA, CDRH4D22HPNP-220MC
2
2
C36, C38
CAP, 10µF, X5R, 35V, 20%, 0805
TDK, C2012X5R1V106M085AC
3
1
C37
CAP, 2.2µF, X7R, 16V, 10%, 0603
MURATA, GRM188R61C225KE15D
4
1
C35
CAP, 0.1µF, X7R, 16V, 10%, 0603
AVX, 0603YC104KAT2A
5
1
C39
CAP, 22pF, C0G, 50V, 10%, 0603
AVX, 06035A220KAT2A
6
1
R91
RES, 0Ω, 1/10W, 1206
VISHAY, CRCW12060000Z0EA
7
1
R92
RES, 1MΩ, 5%, 0603
VISHAY, CRCW06031M00JNED
8
1
R94
RES, 316k, 1/10W, 1%, 0603
VISHAY, CRCW0603316KFKEA
9
1
R98
RES, 226k, 1/10W, 1%, 0603
VISHAY, CRCW0603226KFKEA
10
1
R97
RES, 100k, 1/10W, 1%, 0603
VISHAY, CRCW0603100KFKEA
11
1
U6
IC, LT3970EMS#PBF MSOP
LINEAR TECH., LT3970EMS#PBF
dc2380af
13
1
2
3
4
JP1
3
2
1
ON
JP2
3
2
1
ON
JP3
3
2
1
JP4
E19
3
2
1
E17
RUN4
PGOOD4
OFF
ON
TRACK/SS4
E14
PGOOD3
OFF
RUN3
E13
TRACK/SS3
E10
PGOOD2
OFF
RUN2
E9
TRACK/SS2
E7
PGOOD1
OFF
ON
RUN1
E4
TRACK/SS1
R83
100K
5VBIAS
C32
OPT
VIN
TRK/SS4
R68
100K
5VBIAS
C25
OPT
VIN
TRK/SS3
R50
100K
5VBIAS
C9
OPT
VIN
TRK/SS2
R30
100K
5VBIAS
C3
OPT
VIN
R81
10k
1%
R78
18.2K
R65
10k
1%
R63
18.2K
R46
10k
1%
R43
18.2K
R20
10k
1%
R15
18.2K
RUN4
RUN3
RUN2
RUN1
A
VSNSOUT3
OPT
FB1
R1-3
10.0K
VOS4+
VOS3+
C3-3
3.3nF
R3-3
332
R3-2
332
R1-2
10.0K
VOS2+
C3-2
3.3nF
1
VOS1+
FB4
R21 OPT
R19 OPT
FB3
FB2
R10 OPT
R8
R54
VSNSOUT2
5VBIAS
VCC
COMP2
ILIM2
-C
-B
ILIM4
R14
TP8
VSNSP4
VSNSN4
VSNSOUT4
VSNSOUT3
VSNSN3
VSNSP3
COMP3
FB3
VCC
FB2
COMP2
VSNSP2
VSNSN2
VSNSOUT2
SGND
VSNSOUT1
VSNSN1
VSNSP1
COMP1
OPT
R106
C6
OPT
RUN4
OPT
TRK/SS4
OPT
R18
R27
TRK/SS3
OPT
R26
FB4
C29
OPT
OPT
R108
RUN1 RUN2
TRK/SS1
R44
30.9K
Fsw = 400kHz
OPT
R107
U1
LTC7851EUHH
VOUT3
R3-4
332
R1-4
10.0K
3.3nF
C3-4
3.3nF
100pF
C1-4
R2-4
3.32K
C2-4
COMP4
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
100pF
VOUT2
VSNSOUT4
FB3
COMP3
COMP2
FB2
COMP1
C1-1
RUN3
OPT
R17
VOUT4
1.8V/60A
1.2V/120A
B
1.2V/60A
43.2K
OPT
OPT
43.2K
OPT
OPT
43.2K
OPT
OPT
43.2K
OPT
R47
0
C
C
CIN9
CIN10
22uF
25V
1210
R76
CIN7
CIN8
22uF
25V
1210
R60
CIN5
CIN6
22uF
25V
1210
R41
CIN3
CIN4
22uF
25V
1210
R2
0
0
0
9
0
9
PGND
PGND
PGND
PGND
15
14
13
12
34
33
11
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
0
C23
0.22uF
0
C31
0.22uF
0
R40
1
R59
1
SW
SW
SW
GL
GL
PGND
PVCC
TMON
R75
24
25
26
27
35
28
30
31
24
25
26
27
35
28
29
1
SW
SW
SW
GL
GL
PGND
PVCC
TMON
SW
SW
SW
GL
GL
PGND
PVCC
TMON
EN/FAULT#
24
25
26
27
35
28
29
30
31
R80
10K
24
25
26
27
35
28
29
30
31
R64
10K
EN/FAULT#
C30
2.2uF
16V
30
29
R45
10K
SW
SW
SW
GL
GL
PGND
PVCC
TMON
31
R7
10K
EN/FAULT#
C21
2.2uF
16V
U5
FDMF5820DC
1
EN/FAULT#
C7
2.2uF
16V
U4
FDMF5820DC
R79
PGND
VIN
VIN
VIN
VIN
C1
2.2uF
16V
U3
FDMF5820DC
R62
PGND
VIN
VIN
VIN
VIN
0
U2
FDMF5820DC
C8
0.22uF
R42
PGND
VIN
VIN
VIN
VIN
PGND
PGND
PGND
PGND
PGND
VIN
VIN
VIN
VIN
10
15
14
13
12
34
33
11
10
15
14
13
12
34
33
11
10
9
15
14
13
12
34
33
11
10
9
C2
0.22uF
R3
R1
R9
OPT
C34
2.2uF
16V
R82
OPT
C27
2.2uF
16V
R66
OPT
C10
2.2uF
16V
R48
OPT
C4
2.2uF
16V
5VBIAS
Figure 10. DC2380A-A Demo Circuit Schematic
R69
C24
0.22uF
IAVG4 C26
30
31
ILIM4
C22
0.22uF
TRK/SS3 C19
R61
ILIM3
IAVG3 C20
C14
0.22uF
C15
IAVG2
R57
ILIM2
TRK/SS2 C16
C17
34
33
TRK/SS4
RUN4
R51
C11
C13
0.22uF
ILIM1
IAVG1
CLKOUT
E2
32
35
36
37
38
39
40
41
42
43
44
45
46
47
48
CLKIN
E1
Place on edge of board
RUN3
IAVG4
ISNS4P
ISNS4N
ISNS3N
ISNS3P
IAVG3
ILIM3
TRACK/SS3
PGOOD2
VINSNS
TRACK/SS2
ILIM2
IAVG2
ISNS2P
ISNS2N
ISNS1N
ISNS1P
IAVG1
ILIM1
VSNSOUT2 VSNSOUT3 VSNSOUT4
OPT
FB1
RUN2
TRK/SS2
OPT
R16
R25
TRK/SS1
2.2nF
C2-1
5.62K
R2-1
R3-1
332
3.3nF
R1-1
10.0K
C3-1
OPT
IAVG4
OPT
R24
RUN1
VSNSOUT1
COMP4
OPT
R6
1.8V/30A 1.5V/30A 1.2V/30A 1.0V/30A
VOUT1
RB-4 VOS415.0K
RT-4
10.0K
C2-3
100pF
C2-2
100pF
VOS2-
VCC
C18 1uF
RB-1 VOS110.0K
RB-2
10k
TP7
VSNSOUT1
R13
IAVG3
OPT
RB-3 VOS310k
-A
ILIM3
OPT
R23
R12
TP6
COMP3
OPT
R5
OPT
IAVG2
OPT
R22
OPT
R4
RT-3
10.0K
R2-3
3.48K
C1-3
3.3nF
C1-2
2.2nF
R2-2
4.75K
RT-2
15.0K
RT-1
20.0K
TP5
IAVG1
ILIM1
COMP1
Components to parallel two or more phases
54
TRK/SS1
53
5
B
51
2
Place these components on edge of board
58
20
SGND
59
57
FB1
21
COMP4
56
FREQ
22
TRACK/SS4
23
TRACK/SS1
52
RUN1
55
CLKIN
RUN4
24
FB4
CLKOUT
PWM4
25
PGOOD4
26
PGOOD1
50
RUN2
PWM1
PWM3
49
PWM2
RUN3
27
PGOOD3
28
ILIM4
29
8
VIN
7
PHASE
6
NC
SW
18
SW
17
7
19
SW
16
8
VIN
5
NC
NC
SW
6
7
7
16
PHASE
18
SW
19
SW
17
8
VIN
SW
6
PHASE
SW
17
SW
18
6
PHASE
8
VIN
16
SW
17
SW
18
16
4
BOOT
SW
20
4
BOOT
SW
20
5
BOOT
SW
19
5
NC
SW
19
1
PWM
32
AGND
SW
21
32
AGND
SW
VCC
SW
VCC
21
4
AGND
SW
20
SW
20
ZCD#
3
AGND
SW
4
BOOT
SW
22
SW
1
23
2
VCC
3
AGND
SW
ZCD#
SW
2
ZCD#
22
32
PWM
1
PWM
23
3
AGND
SW
21
SW
22
SW
23
2
VCC
1
PWM
32
AGND
SW
ZCD#
SW
3
AGND
SW
21
SW
22
14
23
A
R28
24.9K
R52
24.9K
D
C41
OPT
C42
OPT
R88
0
VOS3-
E16
E15
VOS3+
E12
E11
VOS2-
COUT13
COUT14
COUT15
330uF
2.5V
R74
10
+
R71
10
J4
VOS1-
C5
10uF
0805
VOS1+
J6
VOS3-
C28
10uF
0805
+
J3
VOUT1-
VOUT1+
1.8V / 30A
+
CIN2
180uF
16V
E3
E5
J2
J1
VIN-
VIN-
7V - 14V
VIN+
VIN+
Murata GRM31CR60J107M (100uF, 6.3V, X5R, 1206)
Mike S.
APPROVED
R85
10
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
PCB DES.
MIKE S.
HZ
SCALE = NONE
APP ENG.
J9
VOUT4-
VOUT4+
1.0V / 30A
N/A
DATE:
SIZE
E
www.linear.com
SHEET 1
LTC7851EUHH
DEMO CIRCUIT 2380A-A
OF 2
2
REV.
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
DATE
10-21-15
HIGH OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
TECHNOLOGY
Wednesday, January 27, 2016
IC NO.
TITLE: SCHEMATIC
VOS4-
J10
APPROVALS
VOS4-
E20
C33
10uF
0805
E18
VOS4+
VOUT3-
VOUT3+
1.2V / 30A
VOUT2-
VOS4+
L1-4: Wurth 744301025 (0.25uH, DCR=0.325mOhms +/-7%)
VOUT2+
1.5V / 30A
R77
10
J7
J5
COUT18
COUT19
COUT20
330uF
2.5V
J8
VOS3+
VOS2-
C12
10uF
0805
VOS2+
CUSTOMER NOTICE
R36
OPT
2512
R37
OPT
2512
+
VIN
CIN3-10: Murata GRM32ER71E226K (22uF, 16V, X5R, 1210)
COUT1,2,6,7,11,12,16,17:
E8
CIN1
180uF
16V
DESCRIPTION
REVISION HISTORY
PRODUCTION
2
E
REV
Sanyo 16SVP180MX (180uF, 30mOhms, 3.02A, 16V)
+
__
ECO
COUT3-5,8-10,13-15,18-20: Panaasonic EEFSX0E331ER (330uF, 2.5V, 9mOhms)
VOS2+
COUT8
COUT9
COUT10
330uF
2.5V
R53
10
R58
10
R35
OPT
2512
E6
VOS1-
COUT3
COUT4
COUT5
330uF
2.5V
R39
10
+
R29
10
VOS1+
CIN1,2:
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.
R32
OPT
2512
R31
OPT
2512
R33
OPT
2512
COUT16
COUT17
100uF
6.3V
1206
VOUT4
C43
OPT
R73
0
COUT11
COUT12
100uF
6.3V
1206
COUT6
COUT7
100uF
6.3V
1206
COUT1
COUT2
100uF
6.3V
1206
VOUT3
R56
0
VOUT2
R34
0
0.25uH
744301025
R87
3.57K
1%
L4
R86
24.9K
R84
10K
C40
OPT
VOUT1
R70
24.9K
0.25uH
744301025
R72
3.57K
1%
L3
R67
10K
0.25uH
744301025
R55
3.57K
1%
L2
R49
10K
R38
3.57K
1%
0.25uH
744301025
L1
R11
10K
D
1
2
3
4
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Schematic Diagram
dc2380af
1
2
3
4
B
E24
R93
10k
1%
R95
0.002
1%
2512
OPT
R90
OPT
2512
GND
PULSE GEN B
E26
E25
A
R103
10k
1%
Q3
SUM60N02-3m9P
TO-263
TO-263AB
TO-263 = D2PAK
R104
0.002
1%
2512
OPT
VOUT4
J15
VOUT3
J14
B
E28
ISTEPB+
2mV / Amp
5% DUTY CYCLE MAX.
E30
ISTEPB-
VOUT4
VOUT3
R101
0 mOhm
2512
R102
OPT
2512
VOUT2
J12
VOUT1
J11
ISTEPA+
2mV / Amp
5% DUTY CYCLE MAX.
E29
ISTEPA-
E27
VOUT2
VOUT1
R89
0 mOhm
2512
DYNAMIC LOAD CIRCUIT FOR VOUT3 AND VOUT4
GND
PULSE GEN A
E22
Q1
SUM60N02-3m9P
TO-263AB
TO-263 = D2PAK
DYNAMIC LOAD CIRCUIT FOR VOUT1 AND VOUT2
A
COUT23
COUT22
COUT21
OPT
7343-D15T
C
JP5
3
2
1
5VBIAS
R100
OPT
R99
OPT
+
11
GND
10
1
8
7
6
D
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
HZ
MIKE S.
SCALE = NONE
APP ENG.
PCB DES.
APPROVALS
COUT34
COUT35
COUT33
OPT
7343-D15T
R98
226K
C35
0.1uF
+
DATE:
N/A
SIZE
E
C38
10uF
6.3V
0805
5VBIAS
E23
E21
www.linear.com
GND
5V / 350mA
E
SHEET 2
LTC7851EUHH
DEMO CIRCUIT 2380A-A
OF 2
2
REV.
LTC Confidential-For Customer Use Only
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
0
HIGH OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
TECHNOLOGY
1206
R91
Tuesday, January 26, 2016
IC NO.
C36
10uF
6.3V
0805
COUT39
COUT41
COUT40
OPT
7343-D15T
VOUT4
C39
22pF
TITLE: SCHEMATIC
R94
316K
R92
1.0M
L5
22uH
CDRH4D22/HPNP-220MC
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.
+
VOUT3
RT
FB
BD
BOOST
SW
D
CUSTOMER NOTICE
GND
GND
EN
PG
VIN
COUT28
COUT29
COUT27
OPT
7343-D15T
VOUT2
5
4
2
9
3
Figure 11. DC2380A-A Demo Circuit Schematic
+
VOUT1
OFF
ON
R97 100K
5VBIAS
C37
2.2uF
16V
VIN
U6
LT3970EMS
BIAS SUPPLY FOR DrMOS and LTC7851
C
1
2
3
4
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Schematic Diagram
15
dc2380af
1
2
3
4
JP1
3
2
1
E9
1
JP2
3
2
ON
JP3
3
2
1
E17
JP4
E19
3
2
1
R83
100K
5VBIAS
C32
OPT
VIN
TRK/SS4
R68
100K
5VBIAS
C25
OPT
VIN
TRK/SS3
R50
100K
5VBIAS
C9
OPT
VIN
TRK/SS2
RUN4 OPT
PGOOD4
OFF
ON
TRACK/SS4
E14
PGOOD3
OFF
RUN3
E13
TRACK/SS3
E10
C3
OPT
VIN
5VBIAS
R30
100K
RUN2 OPT
PGOOD2
OFF
ON
TRACK/SS2
E7
PGOOD1
OFF
ON
RUN1
E4
TRACK/SS1
R81
OPT
1%
R78
OPT
R65
10k
1%
R63
18.2K
R46
OPT
1%
R43
OPT
R20
10k
1%
R15
18.2K
RUN4
RUN3
RUN2
RUN1
A
VSNSOUT3
VOS4+
VOS3+
R1-3
10.0K
R1-2
OPT
VOS2+
VOS1+
C3-3
3.3nF
R3-3
332
R3-2
OPT
C3-2
OPT
1
FB3
FB4
R19 OPT
R21 0
FB1
FB2
OPT
R10 0
R8
R54
VSNSOUT2
5VBIAS
VCC
-C
-B
0
VSNSP4
VSNSN4
VSNSOUT4
VSNSOUT3
VSNSN3
VSNSP3
COMP3
FB3
VCC
FB2
COMP2
VSNSP2
VSNSN2
VSNSOUT2
SGND
OPT
C3-4
R2-4
OPT
R3-4
OPT
R1-4
OPT
OPT
OPT
C1-4
C2-4
RUN2
RUN3
0
TRK/SS4
RUN4
C6
OPT
U1
LTC7851EUHH
ILIM1
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
VOUT4
TRK/SS4
RUN4
RUN3
IAVG4
ISNS4P
ISNS4N
ISNS3N
ISNS3P
IAVG3
ILIM3
TRACK/SS3
PGOOD2
VINSNS
TRACK/SS2
ILIM2
IAVG2
ISNS2P
ISNS2N
ISNS1N
ISNS1P
IAVG1
1.8V/60A
1.2V/120A
B
1.2V/60A
R51
C11
R69
OPT
OPT
OPT
43.2K
100pF
OPT
OPT
OPT
OPT
R47
0
C
C
CIN9
CIN10
22uF
25V
1210
R76
CIN7
CIN8
22uF
25V
1210
R60
CIN5
CIN6
22uF
25V
1210
R41
CIN3
CIN4
22uF
25V
1210
R2
0
0
0
9
0
9
PGND
PGND
PGND
PGND
15
14
13
12
34
33
11
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
0
C23
0.22uF
0
C31
0.22uF
0
R40
1
R59
1
SW
SW
SW
GL
GL
PGND
PVCC
TMON
R75
24
25
26
27
35
28
30
31
24
25
26
27
35
28
29
1
SW
SW
SW
GL
GL
PGND
PVCC
TMON
SW
SW
SW
GL
GL
PGND
PVCC
TMON
EN/FAULT#
24
25
26
27
35
28
29
30
31
R80
10K
24
25
26
27
35
28
29
30
31
R64
10K
EN/FAULT#
C30
2.2uF
16V
30
29
R45
10K
SW
SW
SW
GL
GL
PGND
PVCC
TMON
31
R7
10K
EN/FAULT#
C21
2.2uF
16V
U5
FDMF5820DC
1
EN/FAULT#
C7
2.2uF
16V
U4
FDMF5820DC
R79
PGND
VIN
VIN
VIN
VIN
C1
2.2uF
16V
U3
FDMF5820DC
R62
PGND
VIN
VIN
VIN
VIN
0
U2
FDMF5820DC
C8
0.22uF
R42
PGND
VIN
VIN
VIN
VIN
PGND
PGND
PGND
PGND
PGND
VIN
VIN
VIN
VIN
10
15
14
13
12
34
33
11
10
15
14
13
12
34
33
11
10
9
15
14
13
12
34
33
11
10
9
C2
0.22uF
R3
R1
R9
OPT
C34
2.2uF
16V
R82
OPT
C27
2.2uF
16V
R66
OPT
C10
2.2uF
16V
R48
OPT
C4
2.2uF
16V
5VBIAS
Figure 12. DC2380A-B Demo Circuit Schematic
ILIM4
C24
0.22uF
IAVG4 C26
C22
0.22uF
TRK/SS3 C19
R61
ILIM3
IAVG3 C20
C14
0.22uF
C15
IAVG2
R57
ILIM2
TRK/SS2 C16
C17
43.2K
100pF
CLKOUT
E2
C13
0.22uF
ILIM1
IAVG1
CLKIN
E1
Place on edge of board
1.8V/30A 1.5V/30A 1.2V/30A 1.0V/30A
VOUT3
FB4
C29
OPT
R108
0
RUN1 RUN2
TRK/SS1
R44
30.9K
Fsw = 400kHz
OPT
R107
VSNSOUT2 VSNSOUT3 VSNSOUT4
OPT
0
R18
R27
TRK/SS3
OPT
R17
R26
TRK/SS2
R106
0
FB1
VSNSOUT1
VSNSN1
VSNSP1
COMP1
COMP4
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
100pF
VOUT2
FB3
COMP3
COMP2
FB2
COMP1
C1-1
1.5nF
C2-1
R2-1
6.98K
0
R16
R25
TRK/SS1
RUN1
VSNSOUT1
R3-1
332
3.3nF
R1-1
10.0K
TP8
IAVG4
ILIM4
COMP4
C3-1
0
R14
0
R24
0
R6
VSNSOUT4
VOUT1
RB-4 VOS4OPT
-A
VOS2-
VCC
C18 1uF
RT-4
OPT
C2-3
100pF
C2-2
OPT
RB-2
OPT
RB-1 VOS110.0K
VSNSOUT1
TP7
IAVG3
R13
RB-3 VOS310k
R2-3
4.99K
C1-3
2.2nF
C1-2
OPT
R2-2
OPT
ILIM3
OPT
R23
OPT
TP6
COMP3
OPT
R5
R12
IAVG2
ILIM2
COMP2
0
0
R22
0
R4
RT-3
10.0K
RT-2
OPT
RT-1
20.0K
TP5
IAVG1
ILIM1
COMP1
Components to parallel two or more phases
54
TRK/SS1
53
5
B
51
2
Place these components on edge of board
58
20
SGND
59
57
FB1
21
COMP4
56
FREQ
22
TRACK/SS4
23
TRACK/SS1
55
CLKIN
RUN4
24
FB4
CLKOUT
PWM4
25
PGOOD1
52
RUN1
26
PGOOD4
50
RUN2
PWM1
PWM3
49
PWM2
RUN3
27
PGOOD3
28
ILIM4
29
8
VIN
7
PHASE
6
NC
SW
18
SW
17
7
19
SW
16
8
VIN
5
NC
NC
SW
6
7
7
16
PHASE
18
SW
19
SW
17
8
VIN
SW
6
PHASE
SW
17
SW
18
6
PHASE
8
VIN
16
SW
17
SW
18
16
4
BOOT
SW
20
4
BOOT
SW
20
5
BOOT
SW
19
5
NC
SW
19
1
PWM
32
AGND
SW
21
32
AGND
SW
VCC
SW
VCC
21
4
AGND
SW
20
SW
20
ZCD#
3
AGND
SW
4
BOOT
SW
22
SW
1
23
2
VCC
3
AGND
SW
ZCD#
SW
2
ZCD#
22
32
PWM
1
PWM
23
3
AGND
SW
21
SW
22
SW
23
2
VCC
1
PWM
32
AGND
SW
ZCD#
SW
3
AGND
SW
21
SW
22
16
23
A
R28
24.9K
TP1
R52
24.9K
TP2
R86
24.9K
TP4
D
R88
0
VOS1-
C5
10uF
0805
J4
VOS1+
J3
VOUT1-
VOUT1+
1.8V / 60A
COUT1,2,6,7,11,12,16,17:
E11
OPT
VOS3-
C12
10uF
0805
E16
VOS3-
C28
10uF
0805
+
+
CIN2
180uF
16V
E3
E5
J2
J1
VIN-
VIN-
7V - 14V
VIN+
VIN+
Murata GRM31CR60J107M (100uF, 6.3V, X5R, 1206)
Mike S.
APPROVED
VOUT2+
R85
OPT
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
MIKE S.
HZ
SCALE = NONE
APP ENG.
PCB DES.
APPROVALS
E20
VOS4- OPT
J10
J9
VOUT4-
VOUT4+
N/A
DATE:
SIZE
E
www.linear.com
SHEET 1
LTC7851EUHH
DEMO CIRCUIT 2380A-B
OF 2
2
REV.
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
DATE
10-21-15
HIGH OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
TECHNOLOGY
Wednesday, January 27, 2016
IC NO.
TITLE: SCHEMATIC
VOS4-
C33
10uF
0805
E18
OPT
VOS4+
VOUT3-
VOUT3+
1.2V / 60A
VOS4+
L1-4: Wurth 744301025 (0.25uH, DCR=0.325mOhms +/-7%)
VOUT2-
R77
10
J7
J5
COUT18
COUT19
COUT20
330uF
2.5V
J8
VOS3+
J6
VOS2+
VOS2E12
OPT
E15
VOS3+
VOS2-
COUT13
COUT14
COUT15
330uF
2.5V
R74
10
+
R71
10
VIN
CIN3-10: Murata GRM32ER71E226K (22uF, 16V, X5R, 1210)
CUSTOMER NOTICE
R37
0 mOhm
2010
R36
OPT
2010
R58
OPT
+
CIN1
180uF
16V
DESCRIPTION
REVISION HISTORY
PRODUCTION
2
E
REV
Sanyo 16SVP180MX (180uF, 30mOhms, 3.02A, 16V)
+
__
ECO
COUT3-5,8-10,13-15,18-20: Panaasonic EEFSX0E331ER (330uF, 2.5V, 9mOhms)
VOS2+
COUT8
COUT9
COUT10
330uF
2.5V
R53
10
R35
0 mOhm
2010
E8
E6
VOS1-
COUT3
COUT4
COUT5
330uF
2.5V
R39
10
+
R29
10
VOS1+
CIN1,2:
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.
R32
OPT
2010
R31
0 mOhm
2010
R33
0 mOhm
2010
COUT16
COUT17
100uF
6.3V
1206
VOUT4
C43
OPT
R73
0
COUT11
COUT12
100uF
6.3V
1206
COUT6
COUT7
100uF
6.3V
1206
COUT1
COUT2
100uF
6.3V
1206
VOUT3
C42
OPT
VOUT2
C41
OPT
R56
0
0.25uH
744301025
R87
3.57K
1%
L4
R84
10K
VOUT1
C40
OPT
R34
0
R70
24.9K
TP3
0.25uH
744301025
R72
3.57K
1%
L3
R67
10K
0.25uH
744301025
R55
3.57K
1%
L2
R49
10K
R38
3.57K
1%
0.25uH
744301025
L1
R11
10K
D
1
2
3
4
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Schematic Diagram
dc2380af
1
2
3
4
E24
R93
10k
1%
R95
0.002
1%
2512
Q2
SUM60N02-3m9P
TO-263
OPT
R90
OPT
2512
GND
PULSE GEN B
E26
E25
TO-263 = D2PAK
A
R103
10k
1%
Q3
SUM60N02-3m9P
TO-263
TO-263
R104
0.002
1%
2512
Q4
SUM60N02-3m9P
TO-263
OPT
VOUT2
J12
VOUT1
J11
VOUT4
J15
VOUT3
J14
B
J16
LOAD STEP B
2mV / Amp
5% DUTY CYCLE MAX.
VOUT4
VOUT3
R101
0 mOhm
2512
R102
OPT
2512
B
J13
LOAD STEP A
2mV / Amp
5% DUTY CYCLE MAX.
VOUT2
R89
0 mOhm
2512
VOUT1
DYNAMIC LOAD CIRCUIT FOR VOUT3 AND VOUT4
GND
PULSE GEN A
E22
Q1
SUM60N02-3m9P
TO-263
TO-263 = D2PAK
DYNAMIC LOAD CIRCUIT FOR VOUT1 AND VOUT2
A
3
C
+
COUT23
COUT22
COUT21
OPT
7343-D15T
VOUT1
JP5
2
1
5VBIAS
+
R100
OPT
R99
OPT
COUT26
COUT24
COUT25
OPT
7343-D15T
COUT28
COUT29
COUT27
OPT
7343-D15T
11
GND
+
10
1
8
7
6
COUT31
COUT30
COUT32
OPT
7343-D15T
RT
FB
BD
BOOST
SW
D
SCALE = NONE
HZ
MIKE S.
PCB DES.
APP ENG.
+
DATE:
N/A
SIZE
+
0
E
C38
10uF
6.3V
0805
www.linear.com
E
SHEET 2
LTC7851EUHH
DEMO CIRCUIT 2380A-B
2
REV.
OF 2
HIGH OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
5V / 350mA
5V / 350mA
COUT43
COUT42
COUT44
OPT
7343-D15T
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
+
E23
5VBIAS E21
COUT39
COUT41
COUT40
OPT
7343-D15T
Tuesday, January 19, 2016
IC NO.
1206
R91
VOUT4
C36
10uF
6.3V
0805
TECHNOLOGY
COUT37
COUT36
COUT38
OPT
7343-D15T
C39
22pF
TITLE: SCHEMATIC
R94
316K
R92
1.0M
COUT34
COUT35
COUT33
OPT
7343-D15T
APPROVALS
+
VOUT3
R98
226K
C35
0.1uF
L5
22uH
CDRH4D22/HPNP-220MC
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
+
VOUT2
GND
GND
EN
PG
VIN
D
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.
5
4
2
9
3
U6
LT3970EMS
Figure 13. DC2380A-B Demo Circuit Schematic
OFF
ON
R97 100K
5VBIAS
C37
2.2uF
16V
VIN
BIAS SUPPLY FOR DrMOS and LTC7851
C
1
2
3
4
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Schematic Diagram
17
dc2380af
1
2
3
4
JP1
3
2
1
E9
1
JP2
3
2
ON
JP3
3
2
1
E17
JP4
E19
3
2
1
C25
OPT
5VBIAS
R83
100K
5VBIAS
C32
OPT
VIN
TRK/SS4
R68
100K
RUN4 OPT
PGOOD4
OFF
ON
TRACK/SS4
E14
PGOOD3
OFF
VIN
TRK/SS3
R50
100K
5VBIAS
C9
OPT
VIN
TRK/SS2
RUN3 OPT
E13
TRACK/SS3
E10
C3
OPT
VIN
5VBIAS
R30
100K
RUN2 OPT
PGOOD2
OFF
ON
TRACK/SS2
E7
PGOOD1
OFF
ON
RUN1
E4
TRACK/SS1
R81
OPT
1%
R78
OPT
R65
OPT
1%
R63
OPT
R46
OPT
1%
R43
OPT
R20
10k
1%
R15
18.2K
RUN4
RUN3
RUN2
RUN1
A
1
R54
R21
R19
VSNSOUT3
C3-3
OPT
R3-3
OPT
R3-2
OPT
C3-2
OPT
FB4
FB3
VOS4+
VOS3+
R1-3
OPT
R1-2
OPT
VOS2+
VOS1+
0
0
FB1
FB2
OPT
R10 0
R8
VSNSOUT2
5VBIAS
VCC
-C
-B
VSNSOUT4
FB3
COMP3
COMP2
FB2
COMP1
C1-1
VSNSP4
VSNSN4
VSNSOUT4
VSNSOUT3
VSNSN3
VSNSP3
COMP3
FB3
VCC
FB2
COMP2
VSNSP2
VSNSN2
R3-4
OPT
R1-4
OPT
R2-4
OPT
0
0
RUN4
TRK/SS4
R18
R27
TRK/SS3
RUN3
C6
OPT
R107
U1
LTC7851EUHH
VOUT3
FB4
C29
OPT
R108
0
RUN1 RUN2
TRK/SS1
R44
30.9K
Fsw = 400kHz
0
ILIM1
VOUT4
1.8V/60A
1.2V/120A
B
1.2V/60A
R51
C11
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
OPT
43.2K
100pF
R47
0
C
C
CIN9
CIN10
22uF
25V
1210
R76
CIN7
CIN8
22uF
25V
1210
R60
CIN5
CIN6
22uF
25V
1210
R41
CIN3
CIN4
22uF
25V
1210
R2
0
0
0
9
0
9
PGND
PGND
PGND
PGND
15
14
13
12
34
33
11
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
0
C23
0.22uF
0
C31
0.22uF
0
R40
1
R59
1
SW
SW
SW
GL
GL
PGND
PVCC
TMON
R75
24
25
26
27
35
28
30
31
24
25
26
27
35
28
29
1
SW
SW
SW
GL
GL
PGND
PVCC
TMON
SW
SW
SW
GL
GL
PGND
PVCC
TMON
EN/FAULT#
24
25
26
27
35
28
29
30
31
R80
10K
24
25
26
27
35
28
29
30
31
R64
10K
EN/FAULT#
C30
2.2uF
16V
30
29
R45
10K
SW
SW
SW
GL
GL
PGND
PVCC
TMON
31
R7
10K
EN/FAULT#
C21
2.2uF
16V
U5
FDMF5820DC
1
EN/FAULT#
C7
2.2uF
16V
U4
FDMF5820DC
R79
PGND
VIN
VIN
VIN
VIN
C1
2.2uF
16V
U3
FDMF5820DC
R62
PGND
VIN
VIN
VIN
VIN
0
U2
FDMF5820DC
C8
0.22uF
R42
PGND
VIN
VIN
VIN
VIN
PGND
PGND
PGND
PGND
PGND
VIN
VIN
VIN
VIN
10
15
14
13
12
34
33
11
10
15
14
13
12
34
33
11
10
9
15
14
13
12
34
33
11
10
9
C2
0.22uF
R3
R1
R9
OPT
C34
2.2uF
16V
R82
OPT
C27
2.2uF
16V
R66
OPT
C10
2.2uF
16V
R48
OPT
C4
2.2uF
16V
5VBIAS
Figure 14. DC2380A-C Demo Circuit Schematic
R69
C24
0.22uF
IAVG4 C26
30
ILIM4
C22
0.22uF
31
33
34
TRK/SS3 C19
R61
ILIM3
IAVG3 C20
C14
0.22uF
C15
IAVG2
R57
ILIM2
TRK/SS2 C16
C17
C13
0.22uF
ILIM1
IAVG1
CLKOUT
E2
32
35
36
37
38
39
40
41
42
43
44
45
46
47
48
TRK/SS4
RUN4
RUN3
IAVG4
ISNS4P
ISNS4N
ISNS3N
ISNS3P
IAVG3
ILIM3
TRACK/SS3
PGOOD2
VINSNS
TRACK/SS2
ILIM2
IAVG2
ISNS2P
ISNS2N
ISNS1N
ISNS1P
IAVG1
CLKIN
E1
Place on edge of board
1.8V/30A 1.5V/30A 1.2V/30A 1.0V/30A
VOUT2
OPT
C3-4
OPT
OPT
C1-4
C2-4
0
R26
0
R17
VSNSOUT2 VSNSOUT3 VSNSOUT4
FB1
VSNSOUT2
SGND
0
RUN2
TRK/SS2
R106
0
VSNSOUT1
VSNSN1
VSNSP1
COMP1
COMP4
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
220pF
2.2nF
C2-1
R2-1
4.12K
0
R16
R25
TRK/SS1
RUN1
VSNSOUT1
R3-1
332
3.3nF
R1-1
10.0K
TP8
IAVG4
ILIM4
COMP4
C3-1
0
R14
0
R24
0
R6
VOUT1
RB-4 VOS4OPT
-A
VOS2-
VCC
C18 1uF
RT-4
OPT
C2-3
OPT
C2-2
OPT
RB-3 VOS3OPT
R2-3
OPT
C1-3
OPT
C1-2
OPT
R2-2
OPT
RB-1 VOS110.0K
RB-2
OPT
TP7
IAVG3
ILIM3
COMP3
VSNSOUT1
0
TP6
R13
0
R23
0
R5
0
IAVG2
ILIM2
COMP2
R12
0
R22
0
R4
RT-3
OPT
RT-2
OPT
RT-1
10.0K
TP5
IAVG1
ILIM1
COMP1
58
Components to parallel two or more phases
54
TRK/SS1
53
5
B
51
2
Place these components on edge of board
SGND
59
57
FB1
20
TRACK/SS4
22
COMP4
21
FREQ
56
TRACK/SS1
55
CLKIN
RUN4
23
PWM4
24
FB4
CLKOUT
52
RUN1
25
PGOOD1
50
RUN2
PWM1
PWM3
26
PGOOD4
49
PWM2
RUN3
27
PGOOD3
28
ILIM4
29
8
VIN
7
PHASE
6
NC
SW
18
SW
17
7
19
SW
16
8
VIN
5
NC
NC
SW
6
7
7
16
PHASE
18
SW
19
SW
17
8
VIN
SW
6
PHASE
SW
17
SW
18
6
PHASE
8
VIN
16
SW
17
SW
18
16
4
BOOT
SW
20
4
BOOT
SW
20
5
BOOT
SW
19
5
NC
SW
19
1
PWM
32
AGND
SW
21
32
AGND
SW
VCC
SW
VCC
21
4
AGND
SW
20
SW
20
ZCD#
3
AGND
SW
4
BOOT
SW
22
SW
1
23
2
VCC
3
AGND
SW
ZCD#
SW
2
ZCD#
22
32
PWM
1
PWM
23
3
AGND
SW
21
SW
22
SW
23
2
VCC
1
PWM
32
AGND
SW
ZCD#
SW
3
AGND
SW
21
SW
22
18
23
A
R28
24.9K
TP1
R52
24.9K
TP2
R86
24.9K
TP4
D
0.25uH
744301025
R87
3.57K
1%
L4
R84
10K
R88
0
C43
OPT
COUT16
COUT17
100uF
6.3V
1206
VOUT4
+
J4
J6
VOS3-
C28
10uF
0805
J3
VOUT1-
VOUT1+
1.2V / 120A
+
CIN2
180uF
16V
E3
E5
J2
J1
VIN-
VIN-
7V - 14V
VIN+
VIN+
Murata GRM31CR60J107M (100uF, 6.3V, X5R, 1206)
Mike S.
APPROVED
VOUT2+
R85
OPT
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
J10
J9
MIKE S.
SCALE = NONE
HZ
PCB DES.
APP ENG.
APPROVALS
VOUT4-
VOUT4+
N/A
DATE:
SIZE
E
SHEET 1
LTC7851EUHH
DEMO CIRCUIT 2380A-C
Wednesday, January 27, 2016
IC NO.
www.linear.com
2
OF 2
REV.
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
DATE
10-21-15
OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
TECHNOLOGY
TITLE: SCHEMATIC HIGH
VOS4-
C33
10uF
0805
E18
OPT
E20
VOS4- OPT
COUT18
COUT19
COUT20
330uF
2.5V
VOS4+
VOUT3-
VOUT3+
VOS4+
L1-4: Wurth 744301025 (0.25uH, DCR=0.325mOhms +/-7%)
VOUT2-
R77
10
J7
J5
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.
+
J8
VOS3+
VOS2-
C12
10uF
0805
VOS2+
CUSTOMER NOTICE
E16
VOS3- OPT
E15
OPT
VOS3+
E12
VOS2- OPT
COUT13
COUT14
COUT15
330uF
2.5V
VOS1-
C5
10uF
0805
VOS1+
COUT1,2,6,7,11,12,16,17:
E11
OPT
VOS2+
R74
OPT
+
R71
10
R36
0 mOhm
2010
R58
OPT
+
VIN
Sanyo 16SVP180MX (180uF, 30mOhms, 3.02A, 16V)
CIN1
180uF
16V
DESCRIPTION
REVISION HISTORY
PRODUCTION
2
E
REV
CIN3-10: Murata GRM32ER71E226K (22uF, 16V, X5R, 1210)
CIN1,2:
+
__
ECO
COUT3-5,8-10,13-15,18-20: Panaasonic EEFSX0E331ER (330uF, 2.5V, 9mOhms)
VOS1-
COUT8
COUT9
COUT10
330uF
2.5V
R53
10
R35
0 mOhm
2010
E8
E6
VOS1+
COUT3
COUT4
COUT5
330uF
2.5V
R29
10
R39
10
R37
0 mOhm
2010
R32
0 mOhm
2010
R31
0 mOhm
2010
R33
0 mOhm
2010
COUT11
COUT12
100uF
6.3V
1206
COUT6
COUT7
100uF
6.3V
1206
VOUT3
C42
OPT
R73
0
R56
0
VOUT2
C41
OPT
COUT1
COUT2
100uF
6.3V
1206
VOUT1
C40
OPT
R34
0
R70
24.9K
TP3
0.25uH
744301025
R72
3.57K
1%
L3
R67
10K
0.25uH
744301025
R55
3.57K
1%
L2
R49
10K
R38
3.57K
1%
0.25uH
744301025
L1
R11
10K
D
1
2
3
4
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Schematic Diagram
dc2380af
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
2
3
4
E24
R93
10k
1%
R95
0.002
1%
2512
Q2
SUM60N02-3m9P
TO-263
OPT
R90
OPT
2512
GND
PULSE GEN B
E26
E25
A
R103
10k
1%
Q3
SUM60N02-3m9P
TO-263
TO-263
TO-263 = D2PAK
R104
0.002
1%
2512
Q4
SUM60N02-3m9P
TO-263
OPT
VOUT3
R102
OPT
2512
VOUT2
J12
VOUT1
J11
VOUT4
J15
VOUT3
J14
B
J16
LOAD STEP B
2mV / Amp
5% DUTY CYCLE MAX.
VOUT4
R101
0 mOhm
2512
B
J13
LOAD STEP A
2mV / Amp
5% DUTY CYCLE MAX.
VOUT2
VOUT1
R89
0 mOhm
2512
DYNAMIC LOAD CIRCUIT FOR VOUT3 AND VOUT4
GND
PULSE GEN A
E22
Q1
SUM60N02-3m9P
TO-263
TO-263 = D2PAK
DYNAMIC LOAD CIRCUIT FOR VOUT1 AND VOUT2
A
3
C
+
COUT23
COUT22
COUT21
OPT
7343-D15T
VOUT1
JP5
2
1
5VBIAS
R100
OPT
R99
OPT
RT
FB
BD
BOOST
SW
10
1
8
7
6
D
HZ
MIKE S.
SCALE = NONE
APP ENG.
PCB DES.
APPROVALS
+
C39
22pF
DATE:
N/A
SIZE
1206
R91
C38
10uF
6.3V
0805
E
SHEET 2
LTC7851EUHH
DEMO CIRCUIT 2380A-C
OF 2
2
REV.
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
www.linear.com
5V / 350mA
5V / 350mA
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
E23
5VBIAS E21
HIGH OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
TECHNOLOGY
+
0
E
COUT39
COUT41
COUT40
OPT
7343-D15T
VOUT4
C36
10uF
6.3V
0805
Tuesday, January 19, 2016
IC NO.
TITLE: SCHEMATIC
R94
316K
R92
1.0M
COUT34
COUT35
COUT33
OPT
7343-D15T
VOUT3
R98
226K
C35
0.1uF
L5
22uH
CDRH4D22/HPNP-220MC
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
+
11
GND
COUT28
COUT29
COUT27
OPT
7343-D15T
VOUT2
GND
GND
EN
PG
VIN
D
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.
5
4
2
9
3
U6
LT3970EMS
Figure 15. DC2380A-C Demo Circuit Schematic
OFF
ON
R97 100K
5VBIAS
C37
2.2uF
16V
VIN
BIAS SUPPLY FOR DrMOS and LTC7851
C
1
2
3
4
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
Schematic Diagram
dc2380af
19
DEMO MANUAL DC2380A-A/
DC2380A-B/DC2380A-C
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
20 Linear Technology Corporation
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LT 0216 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
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