11
dc1755af
DEMO MANUAL DC1755A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
A
A
B
B
C
C
D
D
E
E
4
4
3
3
2
2
1
1
DYNAMIC LOAD CIRCUIT FOR VOUTA
BIA SUPPLY & UVLO CIRCUIT
.X
A
M
E
CL
Y
C
YT
U
D
%5
.X
A
M
E
CL
Y
C
YT
U
D
%5
DYNAMIC LOAD CIRCUIT FOR VOUTB
5V / 400mA
UVLO CIRCUIT
UVLO THRESHOLD = 5.5V RISING
LOAD STEP
10mV / Amp
LOAD STEP
10mV / Amp
OPTIONAL COUT
PWM ENABLE CIRCUIT FOR
NON-THREE STATE
COMPATIBLE DRMOS
WURTH EL.7447789127
OPTIONAL COMPONENTS FOR SINGLE OUTPUT
CONVERTER WITH 4,6 or 12 PHASES
RIGHT
ANGLE
HEADER
RIGHT
ANGLE
SOCKET
CONNECT TO
PARALLEL
DC1755A
CONNECT TO
PARALLEL
DC1755A
VIN
RUNB
RUNA
5VBIAS
VOA+
VOB+
VOA+
VOB+
PWMEN3
DISBL#1
PWMEN1
DISBL#3
DISBL#4
DISBL#2
PWMEN4
PWMEN2
THDN1
THDN2
THDN3
THDN4
VIN
VIN
FBB
VOB+
TRACK/SSB
COMPB
VCCB
TRACK/SSA
IAVGB
RUNB
COMPA
FBA
VOA+
RUNA
IAVGA
VCCA
CLKINA
CLKOUTB
5VBIAS
VOA+
VOB+
SIZE
DATE:
.V
E
R
.
O
N
CI
SHEET
O
F
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
33
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE
DATE:
.V
E
R
.
O
N
CI
SHEET
O
F
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
33
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
SIZE
DATE:
.V
E
R
.
O
N
CI
SHEET
O
F
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Monday, January 16, 2012
33
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
C29 2.2uF
16V
C29 2.2uF
16V
COUT41
OPT
1206
COUT41
OPT
1206
VOUTB
J8
VOUTB
J8
+
COUT31
7343H
OPT
+
COUT31
7343H
OPT
C28
1uF
C28
1uF
C30 10pF
C30 10pF
R76
10k
R76
10k
+
COUT34
7343H
OPT
+
COUT34
7343H
OPT
+
COUT26
7343H
OPT
+
COUT26
7343H
OPT
R86
OPT
R86
OPT
E17
PULSE GEN A
E17
PULSE GEN A
+
COUT21
7343H
OPT
+
COUT21
7343H
OPT
Q4
SUD50N03-09P
Q4
SUD50N03-09P
1
2
3
R92
OPT
R92
OPT
R84
OPT
R84
OPT
+
COUT36
7343H
OPT
+
COUT36
7343H
OPT
COUT43
OPT
1206
COUT43
OPT
1206
E25E25
R93
100
R93
100
R83
OPT
R83
OPT
C27 0.1uF
16V
C27 0.1uF
16V
COUT39
OPT
1206
COUT39
OPT
1206
R94
OPT
R94
OPT
R104
OPT
R104
OPT
JP3
ON
OFF
INTERNAL BIAS
JP3
ON
OFF
INTERNAL BIAS
1
3
2
R88
OPT
R88
OPT
R114 OPT
R114 OPT
COUT37
OPT
1206
COUT37
OPT
1206
R81 0.010
1% 2010
R81 0.010
1% 2010
COUT28
OPT
1206
COUT28
OPT
1206
D2
PMEG4005AEA
D2
PMEG4005AEA
E22
GND
E22
GND
COUT27
OPT
1206
COUT27
OPT
1206
+
COUT25
7343H
OPT
+
COUT25
7343H
OPT
R105 20K
R105 20K
R73
OPT
R73
OPT
C26 10uF
C26 10uF
D1 BAV170
SOT23
D1 BAV170
SOT23
3
1
2
E21
GND
E21
GND
R79 0.010
1% 2010
R79 0.010
1% 2010
R108
OPT
R108
OPT
COUT45
OPT
1206
COUT45
OPT
1206
R75 10k
R75 10k
R101
2010
OPT
R101
2010
OPT
COUT47
OPT
1206
COUT47
OPT
1206
Q1
SUD50N03-09P
Q1
SUD50N03-09P
1
2
3
R89
OPT
R89
OPT
R91
OPT
R91
OPT
+
COUT24
7343H
OPT
+
COUT24
7343H
OPT
U8
LT6703IDC-3
U8
LT6703IDC-3
OUT
1
VS
2
+INA
3
GND
4
R96
OPT
R96
OPT
E24
ISTEPB-
E24
ISTEPB-
R103
OPT
R103
OPT
R87
OPT
R87
OPT
COUT42
OPT
1206
COUT42
OPT
1206
+
COUT35
7343H
OPT
+
COUT35
7343H
OPT
R115 OPT
R115 OPT
R77
OPT
R77
OPT
E23
ISTEPA-
E23
ISTEPA-
EXPOSED
PAD
U7
LT3502EDC
EXPOSED
PAD
U7
LT3502EDC
VIN
1
BD
2
FB
3
SHDN
4
GND
5
DA
6
BOOST
7
SW
8
GND
9
+
COUT33
7343H
OPT
+
COUT33
7343H
OPT
J9
MILL MAXX
802-40-008-20-001000
J9
MILL MAXX
802-40-008-20-001000
IAVGA
1
COMPA
2
TRACK/SSA
3
RUNA
4
SGND
5
SGND
6
SGND
7
CLKINA
8
COUT44 OPT
1206
COUT44 OPT
1206
COUT38
OPT
1206
COUT38
OPT
1206
J10
MILL MAXX
803-43-008-20-001000
J10
MILL MAXX
803-43-008-20-001000
IAVGB
1
COMPB
2
TRACK/SSB
3
RUNB
4
SGND
5
SGND
6
SGND
7
CLKOUTB
8
COUT30
OPT
1206
COUT30
OPT
1206
Q2
SUD50N03-09P
OPT
Q2
SUD50N03-09P
OPT
1
2
3
E19
E19
+
COUT23
7343H
OPT
+
COUT23
7343H
OPT
R106
10K
R106
10K
E20
E20
R80 OPT
1% 2010
R80 OPT
1% 2010
R97 105K
R97 105K
R102
2010
OPT
R102
2010
OPT
Q3
SUD50N03-09P
OPT
Q3
SUD50N03-09P
OPT
1
2
3
R95
OPT
R95
OPT
VOUTA
J7
VOUTA
J7
E18
PULSE GEN B
E18
PULSE GEN B
R85
OPT
R85
OPT
L5
27uH
L5
27uH
COUT46
OPT
1206
COUT46
OPT
1206
COUT40
OPT
1206
COUT40
OPT
1206
R90
0
1206
R90
0
1206
R78
OPT
R78
OPT
C25
1uF
C25
1uF
R82 OPT
1% 2010
R82 OPT
1% 2010
R100 127K
1%
R100 127K
1%
COUT48 OPT
1206
COUT48 OPT
1206
+
COUT32
7343H
OPT
+
COUT32
7343H
OPT
R74
OPT
R74
OPT
COUT29
OPT
1206
COUT29
OPT
1206
+
COUT22
7343H
OPT
+
COUT22
7343H
OPT
