DC2380A-A - Schematic

A
B
C
D
E
Place on edge of board
R1
OPT
R12
R13
R14
OPT
OPT
TP7
10
11
33
VSNSOUT2 VSNSOUT3 VSNSOUT4
VSNSOUT1
TP8
R106
R107
R108
OPT
OPT
OPT
34
CIN3
CIN4
22uF
25V
1210
2
1
PWM
ZCD#
32
4
3
VCC
AGND
AGND
6
5
BOOT
PVCC
VIN
PGND
13
PGND
14
PGND
15
PGND
16
SW
VSNSOUT4
RUN4
2
1
ZCD#
PWM
3
VCC
4
32
AGND
AGND
5
BOOT
6
NC
27
VIN
24
SW
C41
OPT
VOS2+
COUT6
COUT7
100uF
6.3V
1206
R56
0
+
COUT8
COUT9
COUT10
330uF
2.5V
R32
OPT
2512
R64
10K
12
13
2
1
PWM
ZCD#
3
VCC
32
4
PVCC
VIN
PGND
PGND
GL
PGND
GL
U4
FDMF5820DC
PGND
PGND
RUN4
BOOT
VIN
PGND
14
R66
OPT
TMON
VOS2-
30
29
28
35
27
2
C27
2.2uF
16V
26
24
SW
R70
24.9K
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
R75
+
R33
OPT
2512
1
R37
OPT
2512
COUT13
COUT14
COUT15
330uF
2.5V
VOS3+
J7
C28
10uF
0805
E16
R79
0
VOS3-
VOS3-
VOS4+
C31
0.22uF
R81
10k
1%
R77
10
VOUT4
C30
2.2uF
16V
R80
10K
PGND
-C
A
PWM
2
3
VCC
ZCD#
32
5
4
BOOT
AGND
6
NC
AGND
SW
SW
PGND
SW
SW
1.2V/60A
GL
U5
FDMF5820DC
PGND
16
1.8V/60A
PGND
23
15
-B
GL
22
14
PGND
PGND
SW
13
VIN
21
12
SW
1.8V/30A 1.5V/30A 1.2V/30A 1.0V/30A
34
SW
CIN9
CIN10
22uF
25V
1210
VOUT4
PVCC
20
VOUT3
TMON
VIN
19
-A
VOUT2
VIN
SW
33
VOUT1
EN/FAULT#
18
11
SW
10
VIN
17
9
PHASE
VIN
7
+
R82
OPT
SW
R84
10K
30
28
35
27
26
25
24
C34
2.2uF
16V
COUT18
COUT19
COUT20
330uF
2.5V
R85
10
C43
OPT
R86
24.9K
CUSTOMER NOTICE
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.
J9
VOUT4+
1.0V / 30A
VOUT4-
D
E20
1
VOS4-
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
HZ
MIKE S.
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C
C33
10uF
0805
VOS4-
L4
1.2V/120A
B
VOS4+
E18
J10
31
29
VOUT3+
1.2V / 30A
VOUT3-
J8
R74
10
0
FB4
E19
VOUT2-
J6
R67
10K
C29
OPT
R83
100K
VOUT2+
1.5V / 30A
R36
OPT
2512
TRK/SS4
R76
J5
31
SW
SW
34
15
RUN3
VOS2+
C12
10uF
0805
E12
23
33
CIN7
CIN8
22uF
25V
1210
R3-4
332
E11
R53
10
VOUT2
1
EN/FAULT#
SW
43.2K
Murata GRM31CR60J107M (100uF, 6.3V, X5R, 1206)
L1-4: Wurth 744301025 (0.25uH, DCR=0.325mOhms +/-7%)
0.25uH
744301025
R55
3.57K
1%
25
VIN
22
R69
11
AGND
9
10
ILIM4
COUT1,2,6,7,11,12,16,17:
R49
10K
L2
26
23
SW
22
SW
SW
21
20
SW
19
SW
18
SW
SW
16
OPT
5VBIAS
PGOOD4
35
SW
C21
2.2uF
16V
AGND
C24
0.22uF
IAVG4 C26
VOS1-
COUT3-5,8-10,13-15,18-20: Panaasonic EEFSX0E331ER (330uF, 2.5V, 9mOhms)
R52
24.9K
C10
2.2uF
16V
28
C22
0.22uF
R1-4
10.0K
3.3nF
0
C23
0.22uF
SW
30
R62
SW
32
OPT
43.2K
OPT
SW
33
31
VOUT1-
VOS2-
21
34
VOUT1+
1.8V / 30A
3
29
SW
R59
20
35
TRK/SS3 C19
R61
ILIM3
IAVG3 C20
J3
J4
R35
OPT
2512
0
5
36
VOS1+
C5
10uF
0805
R58
10
R60
Sanyo 16SVP180MX (180uF, 30mOhms, 3.02A, 16V)
30
SW
OPT
43.2K
OPT
OPT
NC
37
PGND
6
38
U3
FDMF5820DC
PGND
SW
IAVG4
39
GL
PHASE
ISNS4P
C3-4
7
8
VSNSN4
40
PGND
PGND
14
15
C14
0.22uF
C15
IAVG2
R57
ILIM2
C16
TRK/SS2
C17
PHASE
VIN
ISNS4N
41
13
VINVIN-
31
GL
7
50
49
PWM2
PGOOD1
52
51
RUN2
ISNS3N
VSNSOUT4
42
C13
0.22uF
12
R48
OPT
PGND
8
JP4
53
ISNS3P
VSNSOUT3
C2-4
2
C32
OPT
RUN1
VSNSN3
100pF
C1-4
R2-4
3.32K
3.3nF
R78
18.2K
PWM1
IAVG3
44
43
43.2K
OPT
COMP4
RB-4 VOS415.0K
VIN
CLKOUT
VSNSP3
VSNSP4
R31
OPT
2512
R45
10K
PVCC
SW
3
RT-4
10.0K
56
ILIM3
RB-3 VOS310k
TRK/SS4
RUN4
OFF
RT-3
10.0K
55
TRACK/SS3
COMP3
45
R51
C11
VIN+
7V - 14V
VOS1-
C7
2.2uF
16V
19
VOS4+
E17
COUT3
COUT4
COUT5
330uF
2.5V
E8
PGND
SW
19
FB3
SGND
VOS3+
E14
1
+
1
EN/FAULT#
18
18
PGOOD2
59
R68
100K
ON
COUT1
COUT2
100uF
6.3V
1206
R34
0
R38
3.57K
1%
VIN
8
17
5VBIAS
TRACK/SS4
24
TMON
VIN
R2-3
3.48K
16
C2-3
100pF
VCC
2
PGOOD3
0.25uH
744301025
25
E6
R29
10
VOUT1
L1
26
SW
VIN
16
C1-3
3.3nF
VINSNS
47
46
ILIM1
IAVG1
34
CIN5
CIN6
22uF
25V
1210
ILIM4
VSNSOUT3
C3-3
3.3nF
R1-3
10.0K
TRACK/SS2
FB2
PGOOD3
R3-3
332
R65
10k
1%
15
COMP2
48
29
RUN3
ILIM2
28
13
IAVG2
VSNSP2
RUN3
12
VSNSN2
27
11
FB3
COMP3
C1-2
2.2nF
9
10
ISNS2P
PWM3
JP3
COMP2
FB2
14
2
C25
OPT
C18 1uF
8
ISNS1N
VSNSOUT2
PGOOD4
3
C2-2
100pF
7
IAVG1
ISNS2N
PWM4
OFF
R2-2
4.75K
VOS2-
ILIM1
ISNS1P
26
ON
R3-2
332
R63
18.2K
RUN3
1
27
SW
VIN
33
SGND
25
VIN
R1-2
10.0K
RB-2
10k
VSNSOUT1
RUN4
E13
C3-2
3.3nF
RT-2
15.0K
6
TRACK/SS4
VOS2+
5
VIN
11
U1
LTC7851EUHH
VSNSN1
24
TRK/SS3
4
VSNSP1
20
TRACK/SS3
3
VCC
1
VSNSOUT2
2
RB-1 VOS110.0K
23
R54
RT-1
20.0K
COMP1
22
VOS1+
5VBIAS
1
COMP4
COMP1
FREQ
FB1
E10
54
RUN1 RUN2
CLKIN
100pF
9
10
SW
2.2nF
C2-1
R50
100K
17
5.62K
58
PGOOD2
35
R47
0
C1-1
R2-1
5VBIAS
3
0
C8
0.22uF
TRK/SS1
57
JP2
R46
10k
1%
TRACK/SS1
C9
OPT
FB4
3
2
R44
30.9K
J1
CIN2
180uF
16V
VIN+
VOS1+
0
R42
C6
OPT
21
OFF
C3-1
R3-1
332
3.3nF
R1-1
10.0K
RUN2
R41
Fsw = 400kHz
FB1
17
R43
18.2K
RUN2
1
VSNSOUT1
10-21-15
CIN3-10: Murata GRM32ER71E226K (22uF, 16V, X5R, 1210)
C40
OPT
R28
24.9K
C4
2.2uF
16V
28
R39
10
VIN
ON
30
GL
R40
+
E5
CIN1,2:
29
GL
U2
FDMF5820DC
CIN1
180uF
16V
J2
TRK/SS2
E9
1
NC
TMON
PGND
DATE
Mike S.
4
VIN
PGND
12
E3
R11
10K
31
EN/FAULT#
VIN
E7
TRACK/SS2
7
VIN
SW
OPT
9
R9
OPT
23
OPT
TRK/SS4
R27
IAVG4
OPT
TP6
TRK/SS3
R26
+
1
PGOOD1
TP5
R30
100K
OPT
IAVG3
TRK/SS2
R25
R7
10K
SW
5VBIAS
OPT
IAVG2
ILIM4
R24
22
OPT
IAVG1
ILIM3
R23
SW
JP1
ILIM2
TRK/SS1
21
C3
OPT
R18
OPT
R22
FB3
FB4
R21 OPT
R20
10k
1%
R17
OPT
20
R19 OPT
2
R16
OPT
SW
OFF
3
RUN1
R6
OPT
19
ON
1
R5
OPT
C1
2.2uF
16V
C2
0.22uF
SW
R15
18.2K
RUN1
R4
OPT
ILIM1
4
RUN4
18
FB2
R10 OPT
VIN
RUN3
8
FB1
RUN2
VIN
E4
OPT
RUN1
COMP4
PHASE
R8
COMP3
0
SW
VCC
TRK/SS1
COMP2
R3
SW
COMP1
TRACK/SS1
VIN
Components to parallel two or more phases
APPROVED
PRODUCTION
1
0
17
Place these components on edge of board
DESCRIPTION
2
5VBIAS
R2
REVISION HISTORY
REV
__
CLKOUT
E2
SW
CLKIN
E1
ECO
DATE:
LTC Confidential-For Customer Use Only
HIGH OUTPUT CURRENT
4 PHASE STEP-DOWN CONVERTER
LTC7851EUHH
DEMO CIRCUIT 2380A-A
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
VOUT1
E22
OPT
PULSE GEN A
R93
10k
1%
E24
GND
VIN
3
VOUT2
C37
2.2uF
16V
J12
VOUT2
VOUT3
R101
0 mOhm
2512
E25
OPT
PULSE GEN B
R103
10k
1%
E26
GND
VIN
SW
PG
BOOST
EN
BD
GND
FB
GND
RT
6
C35
0.1uF
1
OFF
3
5VBIAS
R91
C39
22pF
C36
10uF
6.3V
0805
0
1206
C38
10uF
6.3V
0805
8
E21
5V / 350mA
E23
GND
1
R94
316K
10
R98
226K
11
ON
R92
1.0M
7
GND
3
R99
OPT
2
JP5
R100
OPT
J14
VOUT3
VOUT4
J15
R102
OPT
2512
VOUT4
E28
R104
0.002
1%
2512
2
5
R97 100K
DYNAMIC LOAD CIRCUIT FOR VOUT3 AND VOUT4
Q3
SUM60N02-3m9P
TO-263
TO-263AB
2
5VBIAS
ISTEPA+
2mV / Amp
5% DUTY CYCLE MAX.
E29
ISTEPA5VBIAS
TO-263 = D2PAK
9
4
E27
R95
0.002
1%
2512
3
VOUT1
R90
OPT
2512
L5
22uH
CDRH4D22/HPNP-220MC
U6
LT3970EMS
J11
R89
0 mOhm
2512
Q1
SUM60N02-3m9P
TO-263AB
BIAS SUPPLY FOR DrMOS and LTC7851
ISTEPB+
2mV / Amp
5% DUTY CYCLE MAX.
E30
ISTEPB-
VOUT2
VOUT1
+
COUT23
COUT22
COUT21
OPT
7343-D15T
+
VOUT3
COUT28
COUT29
COUT27
OPT
7343-D15T
+
VOUT4
COUT34
COUT35
COUT33
OPT
7343-D15T
+
COUT39
COUT41
COUT40
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.
APP ENG.
TECHNOLOGY
HZ
MIKE S.
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-A
Tuesday, January 26, 2016
SHEET 2
E
REV.
2
OF 2
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