9
dc1755af
DEMO MANUAL DC1755A
SCHEMATIC DIAGRAM
A
A
B
B
C
C
D
D
E
E
4
4
3
3
2
2
1
1
FSWITCH = 500kHz
TYPICAL
PHASES 1 AND 2
CAPACITORS AND RESISTORS ARE 0603
UNLESS OTHERWISE SPECIFIED.
VCCA
5VBIAS
CLKOUTA
VCCA
VCCA
VIN
VIN
VDIFA
IAVGA
COMPA
ILIMA
VCCA
VCCA
THDN1
DISBL#1
PWMEN1
PWMEN2
THDN2
DISBL#2
VOSA-
VOA+
FBA
CLKINA
VIN
RUNA
VOB+
VCCA
TRACK/SSA
VCCA
VOSA+
VIN
VIN
VDIFA
5VBIAS
5VBIAS
VOSA-
VOSA+
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
R
EV
MIKE S
PRODUCTION
11-
82-
90
2
__
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
R
EV
MIKE S
PRODUCTION
11-
82-
90
2
__
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
R
EV
MIKE S
PRODUCTION
11-
82-
90
2
__
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
13
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
13
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
13
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
R6
OPT
R6
OPT
U1
LTC3860EUH
U1
LTC3860EUH
VCC
1
FB1
2
COMP1
3
VSNSOUT
4
VSNSN
5
VSNSP
6
COMP2
7
FB2
8
TRK/S
S2
9
RUN2
17
ILIM2
18
PWM2
16
ISNS1N
21
ISNS2N
20
ISNS1P
22
ILIM1
23
RUN1
24
PWM1
25
IAVG
28
ISNS2P
19
FREQ
10
CLKIN
11
CLKO
UT
12
PHSM
D
13
PGOOD2
14
PWMEN2
15
PWMEN1
26
PGOOD1
27
SGND
29
SGND
30
VIN
SN
S
31
TRK/S
S1
32
GND
33
L2
0.47uH
744355147 WURTH EL.
L2
0.47uH
744355147 WURTH EL.
FDMF6707B
U3
FDMF6707B
U3
SMOD#
1
VCIN
2
VDR
V
3
BOOT
4
CGND
5
GH
6
PHASE
7
NC
8
VIN
9
VIN
10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH
31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29
VSWH
30
VSWH
32
VSWH
33
VSWH
34
VSWH
35
GL
36
CGND
37
THWN
38
DISB#
39
PWM
40
VSWH
43
VIN
42
GND
41
E6
VOSA-
E6
VOSA-
COUT7 100uF
6.3V 1206
COUT7 100uF
6.3V 1206
JP1
ON
OFF
RUNA
JP1
ON
OFF
RUNA
1
3
2
CIN12 OPT
1210
CIN12 OPT
1210
L1 0.47uH
744355147 WURTH EL.
L1 0.47uH
744355147 WURTH EL.
R7
OPT
R7
OPT
CIN4 OPT
1210
CIN4 OPT
1210
R11
0
R11
0
C12 OPT
C12 OPT
R16
0
R16
0
E7
CLKINA
E7
CLKINA
R30 40.2K
R30 40.2K
R12 0
R12 0
RB-A 13.3K
1%
RB-A 13.3K
1%
C32 2.2uF
16V
C32 2.2uF
16V
R15 2.87K
1%
R15 2.87K
1%
C7 1uF
C7 1uF
R29 OPT
R29 OPT
FDMF6707B
U4
FDMF6707B
U4
SMOD#
1
VCIN
2
VDR
V
3
BOOT
4
CGND
5
GH
6
PHASE
7
NC
8
VIN
9
VIN
10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH
31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29
VSWH
30
VSWH
32
VSWH
33
VSWH
34
VSWH
35
GL
36
CGND
37
THWN
38
DISB#
39
PWM
40
VSWH
43
VIN
42
GND
41
R35 OPT
R35 OPT
R27
OPT
R27
OPT
R110 OPT
R110 OPT
R18 59.0k
R18 59.0k
E9
GND
E9
GND
C2 2.2uF
16V
C2 2.2uF
16V
CIN11
OPT
1210
CIN11
OPT
1210
R13
OPT
R13
OPT
C11 2.2uF
16V
C11 2.2uF
16V
R17 1
R17 1
R26
10K
R26
10K
R31 10k
R31 10k
R8 100K
R8 100K
E5
VOSA+
E5
VOSA+
R1
0
R1
0
C2-A
68pF
C2-A
68pF
R4 10K
R4 10K
+
COUT4 330uF
2.5V
+
COUT4 330uF
2.5V
R20
0
R20
0
R2
1
R2
1
R5 OPT
R5 OPT
R34 OPT
R34 OPT
R117 OPT
R117 OPT
C4
100pF
C4
100pF
E4
TRACK/SSA
E4
TRACK/SSA
R116 0
R116 0
R3-A
523
R3-A
523
TP1TP1
R28 OPT
R28 OPT
R33 2.87K
1%
R33 2.87K
1%
C31 2.2uF
16V
C31 2.2uF
16V
CIN6 OPT
1210
CIN6 OPT
1210
C1
0.22uF
C1
0.22uF
R23 OPT
R23 OPT
CIN5 22uF
16V 1210
CIN5 22uF
16V 1210
R10 OPT
R10 OPT
R3 10K
R3 10K
C5 OPT
C5 OPT
E3
PGOODA
E3
PGOODA
C6
OPT
C6
OPT
COUT8 100uF
6.3V 1206
COUT8 100uF
6.3V 1206
R2-A
6.8k
R2-A
6.8k
+
COUT2 330uF
2.5V
+
COUT2 330uF
2.5V
R21 10
R21 10
J1
VIN
6V - 14V
J1
VIN
6V - 14V
R107
1
R107
1
COUT9 100uF
6.3V 1206
COUT9 100uF
6.3V 1206
J4
GND
J4
GND
C9 0.22uF
C9 0.22uF
R25
0
R25
0
+
COUT1 330uF
2.5V
+
COUT1 330uF
2.5V
R24 10K
R24 10K
CIN3 22uF
16V 1210
CIN3 22uF
16V 1210
C8 0.22uF
C8 0.22uF
+
COUT5 330uF
2.5V
+
COUT5 330uF
2.5V
R19 10
R19 10
+
CIN1 180uF
16V
+
CIN1 180uF
16V
+
COUT6
330uF
2.5V
+
COUT6
330uF
2.5V
C3-A
2200pF
C3-A
2200pF
COUT10 100uF
6.3V 1206
COUT10 100uF
6.3V 1206
E1
VIN+
E1
VIN+
TP2TP2
C10
0.22uF
C10
0.22uF
C1-A 470pF
C1-A 470pF
J2
GND
J2
GND
R32 OPT
R32 OPT
R1-A 20K
1%
R1-A 20K
1%
+
COUT3 330uF
2.5V
+
COUT3 330uF
2.5V
C3 OPT
C3 OPT
E2
VIN-
E2
VIN-
R14 OPT
R14 OPT
E8
GND
E8
GND
+
CIN2
OPT
+
CIN2
OPT
R9 OPT
R9 OPT
J3
VOUTA
1.5V / 50A
J3
VOUTA
1.5V / 50A
R112
0
R112
0
