DC2055A - Schematic

5
4
R1
VIN
RUN1
2
20K
E3
ON
1
REVISION HISTORY
REV
__
2
DESCRIPTION
APPROVED
DATE
PRODUCTION
HAORAN W.
11-12-13
PHASMD1 JP2
INTVCC1 120 90
60
DEG DEG DEG
1
4
PLLIN
RUN1
5
C1
OPT
2
VIN
3
2
RUN1
4
1
SW1
RUN1
R2
OPT
2
ECO
3
E1
3
MODE JP1
PS BM CCM
1
4
INTVCC1
R3
OPT
E4
VIN+
OFF
6
3
D
OPT
C19
PGOOD
1
VO1_SNS+
1
2
3
5
6
7
8
R18
2.2
EXTVCC
C13
1uF
0 C18
21
TG2
INTVCC1
Q2
BSC010NE2LSI
4
VIN
0.25uH
744301025
DCR = 0.32m OHM
COUT3
100uF
6.3V
1210
COUT1
100uF
6.3V
1210
+ COUT2
330uF
2.5V
7343
J3
VOUT1
1.0V / 90A
+ COUT4
330uF
2.5V
7343
J4
GND
C
INTVCC1
VO1_SNS-
R20 10
VIN
C14
4.7uF
10V
D2
R23
22
VO1_SNS+
1
2
3
CMDSH-3
BG1
23
CIN4
10uF
1210
Q3
BSC050NE2LS
INTVCC1
CMDSH-3
4
0.1uF
E8
VO1_SNS-
CIN5
10uF
1210
L2
SW2
R28
2
2
5
6
7
8
D1
25
20
R16 10
VOUT1
5
6
7
8
BG2
INTVCC1
4
100K
Q4
BSC010NE2LSI
COUT7
100uF
6.3V
1210
0.25uH
744301025
DCR = 0.32m OHM
COUT8
100uF
6.3V
1210
COUT5
+ 330uF
2.5V
7343
VOUT1
COUT6
+ 330uF
2.5V
7343
1
2
3
220nF
SW2
R17 0
26
24
GND
VIN-
VOUT1
19
SGND/PGND
TG2
27
J2
E7
L1
0.1uF
TG1
28
VIN
4.5V - 14V
E6
R12
715
1%
C7
30
29
+
5
6
7
8
32
33
31
CLKOUT
PHASMD
34
RUN1
MODE/PLLIN
ILIM
TCOMP1
TRSET1
35
36
37
38
SNS2-
R27
R31
OPT
EXTVCC
TRSET1
TCOMP1
39
BOOST2
ENTMPB
41
BG2
SNSA2+
18
C16
220nF
TK/SS2
ENTMPB1
R22
OPT
10
VOSNS2-
IFAST
9
EXTVCC
RUN2
8
INTVCC
VOSNS2+
17
TK/SS1
ITH2
16
7
BOOST1
VIN
IFAST1
6
VO1_SNS-
TG1
BG1
RUN1
VFB1
SW1
CIN2
10uF
1210
R11
3.57k
1%
Q1
BSC050NE2LS
4
SW1
ITH1
FREQ
C
U1
LTC3875EUJ
VOSNS1-
15
5
VOSNS1+
CIN3
10uF
1210
CLKOUT1
TRSET2
4
VIN
ILIM1
14
3
ITH1
INTVCC1
CIN1
270uF
16V
+
3.01K
R10
1K
TRSET2
C9
220pF
TAVG
R15
2K
1%
13
2
TK/SS1
TAVG1
1
TK/SS1
SNS1-
ITH1
SNSD1+
C6
OPT
220nF
12
R14
20k
220nF
VFB1
SNSA1+
C5
OPT
R9
R7
OPT
C4
40
VO1_SNS-
R13
13.3k
CIN18
270uF
16V
1
2
3
R8
OPT
C3
VO1_SNS+
C8 4.7nF
R5
OPT
TCOMP2
C2
0.1uF
11
0 R6
OPT
SNSD2+
TRK/SS1
TCOMP2
TK/SS1
R4
1
VIN
E5
E12
TAVG1
EXTVCC
R32
100K
1%
R34
3.57k
1%
R35
715
1%
C22
1uF
E13
B
D
J1
GND
B
E14
PGOOD1
PGOOD1
JP3 ENTMPB1
1
2 OFF
R40 10k
2
2
2
RN1
OPT
R41
OPT
RN6
OPT
C24
OPT
SW1
R42
OPT
RN2
OPT
BG1
1
C26 OPT
RN5
OPT
C23
OPT
1
R43 4.99k
OPT
3 ON
R39
OPT
TG1
1
TAVG1
TCOMP2
R38
OPT
2
TRSET2
TCOMP1
R37 10k
1
TRSET1
IFAST1 R33
TG2
SW2
BG2
A
TG1
SW1
BG1
TG2
SW2
BG2
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
HZ
HAORAN W. TITLE: SCHEMATIC
HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS
BUCK CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
B
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
REV.
LTC3875EUJ
2
DEMO CIRCUIT 2055A
Tuesday, April 15, 2014
SHEET 1
1
OF 3
A
4
3
2
120 90
60
DEG DEG DEG
1
4
RUN1
2
CLKOUT1
1
CLKOUT
PHASMD2
INTVCC2
3
5
E29
JP6
D
D
VOUT1
5
6
7
8
5
6
7
8
COUT20
100uF
6.3V
1210
+ COUT14
330uF
2.5V
7343
+ COUT16
330uF
2.5V
7343
1
2
3
VIN
C
INTVCC2
VIN
C60
4.7uF
10V
R82 0
21
20
SW2
TG4
D4
CMDSH-3
C43
0.1uF
CIN16
10uF
1210
INTVCC2
CIN15
10uF
1210
E27
R79 OPT
VO2_SNS+
Q14
BSC050NE2LS
4
VO2_SNS+
L4
SW4
BG4
R87
INTVCC2
4
100K
Q15
BSC010NE2LSI
0.25uH
744301025
DCR = 0.32m OHM
COUT19
100uF
6.3V
1210
COUT15
100uF
6.3V
1210
R92
OPT
R99
TAVG2 100K
1%
R86
3.57k
1%
J14
VOUT2
VOUT2
5
6
7
8
19
PGOOD
ENTMPB
18
RUN2
IFAST
17
16
15
FREQ
TRSET2
C56
1uF
Q13
BSC010NE2LSI
4
COUT13
100uF
6.3V
1210
COUT17 COUT18
+ 330uF + 330uF
2.5V
2.5V
7343
7343
VOUT2
UP TO 30A
J16
GND
1
2
3
220nF
1
2
3
32
33
31
CLKOUT
PHASMD
34
RUN1
38
37
TCOMP1
SNSPDC1
39
C44
OPT
TK/SS2
2.2
22
TG2
ENTMPB2
R63
OPT
C38
0.1uF
IFAST2
R65
OPT
14
R96
R64 0
TRK/SS2
SGND/PGND
TAVG
41
25
EXTVCC
BOOST2
SNSN2
TRSET4
E33
SNSPAC2
10
C62
220nF
R62
VOUT1
0.25uH
744301025
DCR = 0.32m OHM
23
BG2
13
VO2_SNS-
R97
OPT
C55
OPT
R84
OPT
TK/SS2
9
TAVG2
VO2_SNS+
C54
OPT
INTVCC2
CMDSH-3
BG3
26
24
EXTVCC
VOSNS2-
8
TK/SS2
R83
OPT
VIN
D3
5
6
7
8
7
27
INTVCC
VOSNS2+
R60 0
28
BG1
ITH2
6
VFB2
TG1
L3
TG3
1
2
3
5
ITH2
ITH2
TCOMP2
C58
OPT
12
R88 OPT
29
BOOST1
ITH1
C42
0.1uF
30
SW1
R70
715
1%
Q16
BSC050NE2LS
4
SW3
R77
CIN14 3.57k
10uF 1%
1210
CIN13
10uF
1210
CLKOUT
U3
LTC3875EUJ
VOSNS1-
4
ITH1
C
VOSNS1+
3
VO1_SNS-
C57 220pF
TK/SS1
TCOMP4
2
SNSN1
VFB1
SNSPDC2
1
11
TK/SS1
SNSPAC1
40
ITH1
VIN
ILIM2
MODE/PLLIN
220nF
C63
OPT
TRSET3
220nF
VIN
INTVCC2
3.01K
R81
1K
35
C52
TCOMP3
C46
R80
R93
OPT
ILIM
OPT
36
R94
TRSET1
R91
OPT
VO2_SNS- E28
R68 OPT
R85
715
1%
VO2_SNS-
E23
RUN2
B
B
E24
PGOOD2
PGOOD2
JP4 ENTMPB2
1
OFF
IFAST2 R69
2
TCOMP3
R78 10k
TCOMP4
R74
OPT
RN8
OPT
2
R75
OPT
RN3
OPT
RUN2
SW2
RUN2
ON
R89 OPT
5
OFF
SW3
VIN
4
1
R73
OPT
2
2
RN4
OPT
TG3
C49
OPT
1
C37 OPT
C48
OPT
1
RN7
OPT
1
R44 4.99k
1
TAVG2
OPT
R76
OPT
R101 10k
2
TRSET4
3 ON
2
C59
OPT
R90
OPT
BG3
TG4
SW4
6
3
TRSET3
BG4
A
TG3
DUAL-OUTPUT
CONFIG
SW3
BG3
R83
R84
R88
VOUT2 = 1.5V 30.1k
20k
10k
R85
R79
R68
931
0
0
BG4
APPROVALS
TECHNOLOGY
HZ
HAORAN W. TITLE: SCHEMATIC
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
B
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS
BUCK CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
3
L4
SW4
CUSTOMER NOTICE
4
C58
TG4
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
5
R86
1.5nF 0.33uF/0.32mOHM 4.64k
744301033
DATE:
IC NO.
REV.
LTC3875EUJ
2
DEMO CIRCUIT 2055A
Tuesday, April 15, 2014
SHEET 2
1
OF 3
A
5
4
3
2
1
REMOVE ZERO OHM JUMPERS FOR DUAL-OUTPUT OPERATION
VFB2
0
R51
R53
0
R54
TAVG2
0
6
R52
10K
+
8
COUT9
330uF
7343
+
COUT10
330uF
7343
C29
100uF
6.3V
1210
TG4
8
1
5
4
3
2
+
COUT12
330uF
7343
C33
100uF
6.3V
1210
C34
100uF
6.3V
1210
C35
0.22uF
Q8
RJK0305DPB
J10
IOUT2
1
C36
0.22uF
5
4
3
2
9
7
GND
J9
VOUT2
2
3
4
5
COUT11
330uF
7343
8
6
E17
B
+
Q10
FDMS3620S
OPT
5
5
6
7
9
9
7
R55
10K
R56
0.005
2512
1
BG4
6
C32
0.22uF
IO1STEP_CLK
VOUT2
4
3
2
1
8
5
1
C
VOUT1
E16
4
Q7
RJK0305DPB
E18
4
R57
10K
3
2
1
Q18
FDMS3620S
OPT
C31
0.22uF
CIN8
OPT
2
3
4
4
3
CIN12
OPT
C30
100uF
6.3V
1210
9
5
5
6
7
9
9
7
5
6
VIN
CIN9
OPT
J7
1
VOUT1
IOUT1
BG3
5
5
2
3
4
5
1
BG2
Q9
FDMS3620S
OPT
TG3
1
1
8
6
BYP
4
C28
10uF
16V
5
8
2
2
3
CIN17
OPT
4
GND
2
R50
34.8K
1%
3
2
1
TG2
4
2
1
8
5
6
7
7
ADJ
D
OPT
3
5
1
VIN
SW3
NC
SHDN
2
LOAD STEP CIRCUIT 1
Q6
FDMS3620S
OPT
SW2
7
OUT
EXTVCC
R47
1
Q12
FDMS3620S
OPT
SW1
9
OUT
IN
NC
8
J8
Q17
FDMS3620S
OPT
IN
+5.5V
1
CIN7
OPT
2
3
4
4
3
CIN11
OPT
3
CIN6
OPT
BG1
B
NC
VIN
7
TG1
8
9
9
R49
10K
NC
OFF
6
1
R61
TAVG1
10
JP5
BIAS
ON
VIN
Q5
FDMS3620S
OPT
2
3
4
0
RUN2
CIN10
OPT
C
R72
0
OPTIONAL 5mm x 6mm Dual-MOSFETs
Q11
FDMS3620S
OPT
11
C27
10uF
16V
0
TK/SS2
RUN1
12
VIN
R67
ITH2
TK/SS1
VIN
0
0
ITH1
U2
LT1763CDE
OPTIONAL 5.5V BIAS
R66
VO2_SNS-
2
D
VOUT2
0
13
R48
VO1_SNS-
R59
VOUT1
GND
0
3
R46
VFB1
IO2STEP_CLK
E19
GND
R58
0.005
2512
SW4
LOAD STEP CIRCUIT 2
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.
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
HZ
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
HAORAN W. TITLE: SCHEMATIC
HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS
BUCK CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
B
SCALE = NONE
2
DATE:
IC NO.
REV.
LTC3875EUJ
2
DEMO CIRCUIT 2055A
Tuesday, April 15, 2014
SHEET 3
1
OF 3
A
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