DC1617A - Schematic

1
2
3
4
5
6
7
8
REVISION HISTORY
ECO
3
2
4
1
JP3
4
CIN7
4.7uF
50V
1210
R33
C43
TRK/SS1
6
ITH1
7
20K 1%
20K 1%
9
VFB2
330pF
VOUT1
10
ITH2
C44
R34
12
S2+
OPT
R36
11
TRK/SS2
R35
3.3nF
E10
8
VFB1
C15 0.22uF
11.8K 1%
0
13
TRK/SS2
14
R37
C47
R69
S2-
OPT
15
OPT
0.1uF
C49
VIN
R43
40.2K
1%
22pF
16
17
R38
RUN2
19
1
2
CLKOUT
SENSE1-
SW1
TRK/SS1
TG1
ITH1
BOOST1
VFB1
PGND1
VFB2
BG1
ITH2
VIN
TK/SS2
INTVCC
SENSE2+
EXTVCC
SENSE2-
BG2
DIFFP
PGND2
DIFFN
BOOST2
DIFFOUT
TG2
RUN2
SW2
ILIM1
JP2
C48
R41
OPT
OPT
PGOOD2
ILIM2
PGOOD1
36
R40
OPT
1%
E11
R57
8.45K
1%
L1
VO1+
RS1
C20
L1-
0.1uF
33
TG1
32
R9
Q6
OPT
0.9uH
D1
0
31
DFLS1100-7
30
VOUT1
0
2010
COUT3
100uF
1210
R58
0
4
+ COUT2
330uF
4V
7343
VOUT1
2.5V / 15A
+ COUT1
330uF
4V
7343
J4
GND
Q2
RJK0330DPB
BG1
VO1-
VIN
VIN
2.2
28
INTVCC
EXTVCC
26
C11
4.7uF
10V
BG2
C17
0.1uF
50V
CIN8
4.7uF
50V
1210
Q3
RJK0305DPB
25
NOTES: UNLESS OTHERWISE SPECIFIED,
CIN11
OPT
1210
1. ONLY APPLY LOAD FROM J3 TO J4 FOR VOUT1
2. ONLY APPLY LOAD FROM J5 TO J6 FOR VOUT2
24
R25
23
D2
R59
INTVCC
0
22
4
DFLS1100-7
C21
0.1uF
21
4
3.09K
3. ALL CAPCITORS AND RESISTORS ARE IN 0603.
4. INSTALL SHUNTS AS SHOWN.
Q7
OPT
R60
11.0K
1%
1%
L2
TG2
20
RS2
SW2
J5
L2-
4
R70
0.9uH
4
VOUT2
0
2010
COUT6
100uF
1210
R62
0
Q8
OPT
COUT5
+ 330uF
4V
7343
+
VOUT2
1.8V / 15A
COUT4
330uF
4V
7343
J6
Q4
RJK0330DPB
GND
C
OPT
E3
R64
10
R65
10
OPT
E14
VOUT2
VO2_SNSVO2_SNS+
C50
E2
B
E12
R18
29
27
4
INTVCC
0
R73
J3
34
VOUT1
EXTVCC
2
2
S1+
3.09K
SW1
R39
OPT
R12
OPT
R56
35
1
2
3
3
R72
EXTVCC
SENSE1+
RUN2
EXTVCC
C
18
0
PHSASMD
39
ON
OFF
R11
OPT
GND
S1-
R32
J2
4
S2+
5
220pF
B
4.5V to 26V
+ CIN1
220uF
50V
S2-
C42
R31
20K
1%
MODE/PLLIN
RUN1
4
5
6
7
8
4
ITEMP1
37
Q5
OPT
1
2
3
0.1uF
FREQ
5
6
7
8
OPT
3
1nF
ITEMP2
CLKOUT
1
2
3
C2
C41
A
VIN
VIN-
1
2
3
2
R2
J1
CIN9
OPT
1210
5
6
7
8
TRK/SS1
Q1
RJK0305DPB
38
1
2
3
1
0.22uF
5
6
7
8
LTC3855EFE
5
6
7
8
C14
5
6
7
8
OPT
CIN6
4.7uF
50V
1210
R7
0
U1
1
2
3
S1+
S1-
1
2
3
R28
R3
0
VIN+
CIN3
4.7uF
50V
1210
E6
5
6
7
8
C38
JP1
CIN4
4.7uF
50V
1210
VIN
Fsw = 250kHz (typ)
R30
OPT
RUN1
3
OPT
E9
R29
OPT
1
2
3
22pF
5
6
7
8
OPT
1
2
R27
63.4K
1%
SGND
C37
ITEMP2
ON
OFF
CIN5
4.7uF
50V
1210
0
ITEMP1
RUN1
CIN10
OPT
1210
+ CIN2
OPT
R26
06/20/11
E5
JP4
1
VIN
DATE
MIKE S.
VIN
PLLIN
R10
APPROVED
PRODUCTION
E15
E1
A
DESCRIPTION
2
1
1
20.0K
PHASMD
120 90 60
DEG DEG DEG
INTVCC
3
R68
MODE
PS BM FCM
2
INTVCC
REV
CLKOUT
1uF
INTVCC
GND
INTVCC
R42
OPT
R46
100K
1%
E4
R61
ILIM1
INTVCC
R44
0
R66
100K
1%
OPT
ILIM2
E13
INTVCC
R63
0
PGOOD1
PGOOD1
PGOOD2
PGOOD2
E16
TEMPERATURE COMPENSATION NETWORK FOR DCR SENSING
ITEMP1
R45
OPTIONAL JUMPERS FOR
SINGLE OUTPUT/DUAL PHASE
OPERATION
VFB1
R50
OPT
VFB2
ILIM1
OPT
TRK/SS1
R52
RUN2
R71
RN1
TRK/SS2
ITEMP1
C52
OPT
OPT
RN3
RN2
R47
ILIM2
OPT
R67
C51
2
OPT
R55
100K
OPT
ITEMP2
45.3K
1%
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.
R53
OPT
100K
1
RUN1
2
ITH2
1
R49
CUSTOMER NOTICE
18.2K
1%
2
ITH1
R51
18.2K
1%
1
D
ITEMP2
45.3K
1%
APPROVALS
PCB DES.
APP ENG.
MIKE S.
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
3
TITLE: SCHEMATIC
DUAL OUTPUT SYNCHRONOUS
BUCK CONVERTER
OPT
1
TECHNOLOGY
MI
4
5
6
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
IC NO.
N/A
SCALE = NONE
LTC3855EFE
REV.
DEMO CIRCUIT 1617A-A
DATE: Monday, June 20, 2011
7
SHEET 1
8
2
OF 1
D
1
2
3
4
5
6
7
8
REVISION HISTORY
ECO
3
2
4
1
JP3
4
E5
JP4
CIN7
4.7uF
50V
1210
R33
C43
TRK/SS1
6
ITH1
7
20K 1%
20K 1%
9
VFB2
47pF
VOUT1
10
ITH2
C44
R34
12
S2+
OPT
R36
11
TRK/SS2
R35
1.5nF
E10
8
VFB1
15K
0
C15 1nF
1%
13
TRK/SS2
14
R37
C47
R69
S2-
0
15
OPT
0.1uF
C49
VIN
R43
147K
1%
OPT
16
17
R38
RUN2
19
1
2
SENSE1-
SW1
TRK/SS1
TG1
ITH1
BOOST1
VFB1
PGND1
VFB2
BG1
ITH2
VIN
TK/SS2
INTVCC
SENSE2+
EXTVCC
SENSE2-
BG2
DIFFP
PGND2
DIFFN
BOOST2
DIFFOUT
TG2
RUN2
SW2
ILIM1
JP2
C48
R41
OPT
OPT
PGOOD2
ILIM2
PGOOD1
R40
10
VO1+
L1
RS1
C20
L1-
0.1uF
33
TG1
32
R9
Q6
OPT
13uH
D1
0
31
DFLS1100-7
30
VOUT1
0.008
2010
COUT3
10uF
1210
R58
OPT
4
+ COUT2
OPT
VOUT1
12V / 6A
+ COUT1
68uF
16V
7343
J4
GND
Q2
BSC093N04LS
BG1
VO1-
VIN
VIN
2.2
28
INTVCC
EXTVCC
26
C11
4.7uF
10V
BG2
C17
0.1uF
50V
CIN8
4.7uF
50V
1210
Q3
BSC093N04LS
25
CIN11
OPT
1210
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ONLY APPLY LOAD FROM J3 TO J4 FOR VOUT1
2. ONLY APPLY LOAD FROM J5 TO J6 FOR VOUT2
24
R25
23
D2
R59
INTVCC
0
22
4
DFLS1100-7
C21
0.1uF
21
4
OPT
3. ALL CAPCITORS AND RESISTORS VALUES ARE 0603.
Q7
OPT
4. INSTALL SHUNTS AS SHOWN.
R60
OPT
L2
TG2
20
RS2
SW2
J5
L2-
4
R70
3.7uH
4
VOUT2
0.005
2010
COUT6
10uF
1210
R62
OPT
Q8
OPT
COUT5
+ OPT
+
VOUT2
5V / 10A
COUT4
220uF
6.3V
7343
J6
Q4
BSC093N04LS
GND
C
OPT
E3
R64
10
R65
10
0
E14
VOUT2
VO2_SNSVO2_SNS+
C50
E2
B
E12
R18
29
27
4
INTVCC
OPT
R73
J3
34
VOUT1
EXTVCC
2
2
S1+
E11
R57
OPT
SW1
R39
10
R12
0
OPT
35
1
2
3
3
R72
EXTVCC
CLKOUT
RUN2
EXTVCC
C
18
OPT
SENSE1+
36
39
ON
OFF
R11
OPT
PHSASMD
R56
S1-
R32
GND
4
S2+
5
47pF
B
J2
S2-
C42
R31
15K
1%
MODE/PLLIN
RUN1
4
5
6
7
8
4
ITEMP1
37
Q5
OPT
1
2
3
0.1uF
FREQ
5
6
7
8
OPT
3
3.3nF
ITEMP2
CLKOUT
1
2
3
C2
C41
13V to 36V
+ CIN1
220uF
50V
VIN-
1
2
3
2
R2
A
VIN
CIN9
OPT
1210
5
6
7
8
TRK/SS1
Q1
BSC093N04LS
38
1
2
3
1
1nF
5
6
7
8
LTC3855EFE
5
6
7
8
C14
5
6
7
8
OPT
CIN6
4.7uF
50V
1210
R7
0
U1
1
2
3
S1+
S1-
1
2
3
R28
R3
0
J1
E6
5
6
7
8
JP1
VIN+
CIN3
4.7uF
50V
1210
VIN
Fsw = 250kHz (typ)
R30
10
RUN1
C38
OPT
E9
R29
10
1
2
3
OPT
5
6
7
8
OPT
R27
383K
1%
SGND
C37
1
2
3
CIN4
4.7uF
50V
1210
+ CIN2
OPT
R26
ITEMP2
ON
OFF
CIN5
4.7uF
50V
1210
0
ITEMP1
RUN1
CIN10
OPT
1210
1
VIN
06/20/11
VIN
PLLIN
R10
DATE
MIKE S.
E15
E1
A
APPROVED
PRODUCTION
1
1
20.0K
3
R68
MODE
PS BM FCM
DESCRIPTION
2
CLKOUT
PHASMD
120 90 60
DEG DEG DEG
INTVCC
2
INTVCC
REV
1uF
INTVCC
GND
INTVCC
R42
0
R46
100K
1%
E4
R61
ILIM1
INTVCC
R44
OPT
R66
100K
1%
0
E13
ILIM2
INTVCC
R63
OPT
PGOOD1
PGOOD1
PGOOD2
PGOOD2
E16
TEMPERATURE COMPENSATION NETWORK FOR DCR SENSING
ITEMP1
R45
OPTIONAL JUMPERS FOR
SINGLE OUTPUT/DUAL PHASE
OPERATION
VFB1
R50
OPT
VFB2
ILIM1
OPT
TRK/SS1
R52
RUN2
R71
RN1
TRK/SS2
ITEMP1
C52
OPT
OPT
RN3
RN2
R47
ILIM2
OPT
R67
C51
2
OPT
R55
100K
OPT
ITEMP2
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.
R53
OPT
OPT
OPT
100K
1
RUN1
2
ITH2
1
R49
CUSTOMER NOTICE
OPT
2
ITH1
R51
OPT
1
D
ITEMP2
APPROVALS
PCB DES.
APP ENG.
MIKE S.
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
3
TITLE: SCHEMATIC
DUAL OUTPUT SYNCHRONOUS
BUCK CONVERTER
OPT
1
TECHNOLOGY
MI
4
5
6
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
IC NO.
N/A
SCALE = NONE
LTC3855EFE
REV.
DEMO CIRCUIT 1617A-B
DATE: Monday, June 20, 2011
7
SHEET 1
8
2
OF 1
D
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