DC1755A - Schematic

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