10
dc1755af
DEMO MANUAL DC1755A
SCHEMATIC DIAGRAM
A
A
B
B
C
C
D
D
E
E
4
4
3
3
2
2
1
1
PHASES 3 AND 4
FSWITCH = 500kHz TYPICAL
VDIFB
PWMEN4
ILIMB
THDN4
VCCB
DISBL#4
VCCB
PWMEN3
IAVGB
VIN
VCCB
5VBIAS
VDIFB
VCCB
THDN3
VCCB
VCCB
DISBL#3
COMPB
CLKOUTB
CLKOUTA
FBB
VIN
VCCB
RUNB
TRACK/SSB
VIN
VIN
VOSB+
VOSB-
VOB+
RUNB
5VBIAS
5VBIAS
VOSB+
VOSB-
SIZE
DATE:
.V
E
R
.
O
N
CI
SHEET
OF
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
23
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
OF
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
23
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
OF
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
23
DUAL OUTPUT 4 -PHASE STEP-DOWN CONVERTER
AK
MIKE S.
N/A
LTC3860EUH
DEMO CIRCUIT 1755A
C13
0.22uF
C13
0.22uF
C17 OPT
C17 OPT
R36
0
R36
0
E27
VOSB-
E27
VOSB-
R113 0
R113 0
R54
0
R54
0
R61 10K
R61 10K
E10
PGOODB
E10
PGOODB
+
COUT13 330uF
2.5V
+
COUT13 330uF
2.5V
COUT18 100uF
6.3V 1206
COUT18 100uF
6.3V 1206
U2
LTC3860EUH
U2
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
PHSMD
13
PGOOD2
14
PWMEN2
15
PWMEN1
26
PGOOD1
27
SGND
29
SGND
30
VINS
NS
31
TR
K/SS1
32
GND
33
C22
0.22uF
C22
0.22uF
R38 10K
R38 10K
CIN7 22uF
16V 1210
CIN7 22uF
16V 1210
R3-B 523
R3-B 523
R119 OPT
R119 OPT
R47 OPT
R47 OPT
R49 2.87K
1%
R49 2.87K
1%
R111
OPT
R111
OPT
R45 0
R45 0
R60 OPT
R60 OPT
C33 2.2uF
16V
C33 2.2uF
16V
R69
0
R69
0
R46
0
R46
0
R65 OPT
R65 OPT
R53 10
R53 10
R39
10K
R39
10K
C15 OPT
C15 OPT
R2-B
6.8k
R2-B
6.8k
C16
100pF
C16
100pF
C24
OPT
C24
OPT
E16
GND
E16
GND
C20 0.22uF
C20 0.22uF
R118 0
R118 0
R63
10K
R63
10K
R56 10
R56 10
+
COUT15 330uF
2.5V
+
COUT15 330uF
2.5V
E11
TRACK/SSB
E11
TRACK/SSB
CIN8 OPT
1210
CIN8 OPT
1210
R48 OPT
R48 OPT
R66 OPT
R66 OPT
C21 0.22uF
C21 0.22uF
COUT17 100uF
6.3V 1206
COUT17 100uF
6.3V 1206
R59
0
R59
0
FDMF6707B
U5
FDMF6707B
U5
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
J11
VOUTB
1.2V / 50A
J11
VOUTB
1.2V / 50A
+
COUT11 330uF
2.5V
+
COUT11 330uF
2.5V
R42
OPT
R42
OPT
L4
0.47uH
744355147 WURTH EL.
L4
0.47uH
744355147 WURTH EL.
TP4TP4
C1-B
470pF
C1-B
470pF
R68 OPT
R68 OPT
R44 OPT
R44 OPT
C18 OPT
C18 OPT
R72 OPT
R72 OPT
R62
0
R62
0
R58
OPT
R58
OPT
R70 2.87K
1%
R70 2.87K
1%
R37
1
R37
1
R64 OPT
R64 OPT
R51
1
R51
1
C2-B
68pF
C2-B
68pF
CIN10 OPT
1210
CIN10 OPT
1210
JP2
ON
OFF
RUNB
JP2
ON
OFF
RUNB
1
3
2
L3
0.47uH
744355147 WURST EL.
L3
0.47uH
744355147 WURST EL.
R57
1
R57
1
R40 OPT
R40 OPT
C19
1uF
C19
1uF
R1-B 20K
1%
R1-B 20K
1%
RB-B 20.0K
1%
RB-B 20.0K
1%
E14
CLKOUTB
E14
CLKOUTB
C14
2.2uF
16V
C14
2.2uF
16V
J12
GND
J12
GND
C34 2.2uF
16V
C34 2.2uF
16V
CIN9 22uF
16V 1210
CIN9 22uF
16V 1210
R55
0
R55
0
R41
OPT
R41
OPT
COUT19 100uF
6.3V 1206
COUT19 100uF
6.3V 1206
+
COUT14 330uF
2.5V
+
COUT14 330uF
2.5V
+
COUT16
330uF
2.5V
+
COUT16
330uF
2.5V
R50
0
R50
0
TP3TP3
R43 100K
R43 100K
C3-B 2200pF
C3-B 2200pF
R67 40.2K
R67 40.2K
FDMF6707B
U6
FDMF6707B
U6
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
R52
59.0k
R52
59.0k
R71 OPT
R71 OPT
+
COUT12 330uF
2.5V
+
COUT12 330uF
2.5V
C23
2.2uF
16V
C23
2.2uF
16V
COUT20 100uF
6.3V 1206
COUT20 100uF
6.3V 1206
E26
VOSB+
E26
VOSB+
