DC2142A - Schematic

5
4
R1
20K
2
EXTCLK
E1
PLLIN
ECO
DESCRIPTION
DATE
APPROVED
2
PROTO
10/24/13
YINGYI, Y.
R2
3.01k
1%
C46
R4 2.2
R19
R105
OPT
OPT
CLKOUT
VIN
4.7uF
VIN
OPT
2
C9
OPT
TK/SS1
C11
31
4
OPT
5
6
C15 220pF
5
Q4
OPT
4
ITH1
SNSD1+
220nF
38
VOSNS2+
SNS1-
VOSNS2TKSS2
SW2
RUN2
BG2
SNSD2+
21
TG2
20
SW2
22
BST2
23
BG2
R15
OPT
VO_SNS-
Q6
OPT
R46
10K
1%
R47
10K
1%
R33
100k
1%
R41
OPT
CIN4
10uF
1210
4
11
L2
1
2
3
OPT
INTVCC1
5
9
C18
0.1uF D2
CMDSH-3-TR
0.25uH
Q7
BSC010NE2LSI
4
744301025
DCR=0.32m OHM
Q8
OPT
4
R27
3.57k
1%
10
VOUT
J5
R28
715
1%
VOUT
COUT7
100uF
6.3V
1210
COUT6
100uF
6.3V
1210
COUT8
+ 330uF
6.3V
7343
COUT5
+ 330uF
6.3V
7343
1.0V AT 120A
J6
GND
1
2
3
PGOOD
R45
5k
OPT
17
2
C28
OPT
ISNS2-
CIN3
10uF
1210
B
19
TRSET1
ENTMPB
TRSET2
C27
R48
1
VO_SNS-
OPT
Q5
BSC050NE2LS
C20
220nF
FREQ
36
R43
OPT
B
1
GND
R16
4
TAVG
15
2
C26
SNSA2+
18
14
TCOMP2
SGND/PGND
13
OPT
J4
39
TCOMP1
41
12
RN2
COUT3
+ 330uF
6.3V
7343
C
R24
0
IFAST
37
RUN
OPT
COUT4
+ 330uF
6.3V
7343
R18
OPT
C12
220nF
ITH2
TK/SS
OPT
R9
3.57k
1%
COUT2
100uF
6.3V
1210
R14
10
1%
5
VO_SNS-
R44
R8
715
1%
VOUT
COUT1
100uF
6.3V
1210
E7
BOOST2
16
OPT
Q3
BSC010NE2LSI
4
40
C10
VFB
RN1
J3
CMDSH-3-TR
27 BG1
VOSNS1-
TG2
8
4.02k 1%
R40
OPT
R6
10
1%
VOUT
VIN
7
C16
2.2nF
R21
R13 0
28 BST1
VO_SNSITH
VO_SNS+
1
2
3
VFB
BG1
VOSNS1+
INTVCC1
0.1uF D1
0.25uH
744301025
DCR=0.32m OHM
5
32
33
35
LTC3875EUJ#PBF-ES
C8
30 SW1
5
R17
20k
1%
BOOST1
SNSA1+
3
VO_SNS+
VO_SNS+
1
2
3
R12
13.3k
1%
ILIM
U1
C7
0.1uF
SW1
29 TG1
5
TK/SS
E3
1
2
3
1
TG1
1
2
3
R100
R11
OPT
CIN2
10uF
1210
4
1
2
3
RUN
E6
CIN1
10uF
1210
L1
CLKOUT
RUN1
PHASMD
34
MODE/PLLIN
OPT
EXTVCC
INTVCC
VIN
6
3
R7
E5
TK/SS
Q2
OPT
4.7uF
C5 10nF
24
2
4
OFF
E4
Q1
BSC050NE2LS
5
INTVCC1
C4
26
5
RUN
VIN
RUN
ON
GND
VIN-
R5
1
2
3
SW1
25
J2
C3
1.0uF
+ C2
270uF
16V
4
1
+ C1
270uF
16V
5
D
4.5V - 14V
C
REV
INTVCC1
VIN
J1
1
INTVCC1
EXTVCC
E2
2
REVISION HISTORY
R3 1k
VIN+
D
3
MODE
PS BM CCM
1
4
JP1
3
INTVCC1
EXTVCC
R37
OPT
C24
220nF
R34
OPT
R35
OPT
E11
EXTVCC
INTVCC1
C25
1.0uF
E13
GND
R39
OPT
R42
100k
1%
PGOOD
E14
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.
MI
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
YINGTI
Y.
APP
ENG.
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
2
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
HIGH EFFICIENCY POLYPHASE , SYNCHRONOUS
BUCK CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
N/A
SCALE = NONE
PGOOD
DATE:
IC NO.
LTC3875EUJ / LTC3874EUFD
DEMO CIRCUIT 2142A
02/26/14 08:23:25
SHEET 1
1
REV.
2
OF 3
A
4
3
INTVCC2
R51
2.2
VIN
C29
C30
C31
1.0uF
4.7uF
4.7uF
Q10
BSC050NE2LS
D
Q11
OPT
CIN6
10uF
1210
CIN5
10uF
1210
D
4
18
19
20
4
R49
1
EXTVCC
5
VIN
2
5
5
EXTCLK
8
R57 0
4
RUN
R60 0
5
28
ITH
INTVCC2
LTC3874IUFD#PBF
BG0
RUN0
ISENSE0+
22
BST3
21
BG3
ITH0
ISENSE0-
R59 0
1
2
3
1
2
3
C32
INTVCC2
0.1uF D3
744301025
5
Q13
BSC010NE2LSI
4
CMDSH-3-TR
COUT12
100uF
6.3V
1210
Q14
OPT
4
R58
715
1%
COUT9
100uF
6.3V
1210
COUT10
+ 330uF
6.3V
7343
COUT11
+ 330uF
6.3V
7343
2
RUN1
3
C33
220nF
R63 75k
10
R52
OPT
0
11
FREQ
ISENSE1+
ISENSE1-
BG4
VIN
C
7
6
Q15
BSC050NE2LS
C35
220nF
4
FAULT1B
GND
PHASMD
Q16
OPT
CIN7
10uF
1210
CIN8
10uF
1210
4
26
L4
25
R65
0
C36
INTVCC2
CMDSH-3-TR
R67
0
0
Q17
BSC010NE2LSI
4
Q18
OPT
4
1
2
3
R69
100k
1%
R68
0.25uH
744301025
INTVCC2
0.1uF D4
29
OPT
R64
17
ILIM
FAULT0B
13
BST4
OPT
COUT13
100uF
6.3V
1210
5
BG1
16
R62
R66
715
1%
COUT14
100uF
6.3V
1210
COUT15
+ 330uF
6.3V
7343
COUT16
+ 330uF
6.3V
7343
1
2
3
INTVCC2
SW4
5
BOOST1
15
1
2
3
LOWDCR
TG4
5
SW1
27
14
5
TG1
ITH1
1
2
3
9
100pF
R55
INTVCC2
BOOST0
0
R54
0
R53
U2
MODE1
SW3
R61
C34
OPT
MODE0
TG3
23
VOUT
0.25uH
1
2
3
PGOOD
SW0
24
5
1
TG0
1
2
3
R56 0
SYNC
L3
EXTVCC
12
CLKOUT
C
INTVCC
VIN
OPT
R50 0
Q19
2N7002A
2
PGOOD
3
R70
OPT
B
1
B
TK/SS
VOUT
COUT17
COUT18
+ 330uF
+ 330uF
6.3V
6.3V
7343
7343
COUT19
100uF
6.3V
1210
COUT20
100uF
6.3V
1210
COUT21
1.0uF
C40
100uF
6.3V
1210
C39
100uF
6.3V
1210
COUT22
COUT23
+ 330uF
+ 330uF
6.3V
6.3V
7343
7343
COUT25
100uF
6.3V
1210
COUT24
100uF
6.3V
1210
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.
MI
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
YINGTI
Y.
APP
ENG.
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
2
TECHNOLOGY
TITLE: SCHEMATIC
HIGH EFFICIENCY POLYPHASE , SYNCHRONOUS
BUCK CONVERTER WITH VERY LOW DCR INDUCTOR
SIZE
N/A
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.
LTC3875EUJ / LTC3874EUFD
DEMO CIRCUIT 2142A
03/05/14 13:03:42
SHEET 2
1
REV.
2
OF 3
A
5
4
3
OPTIONAL 5.5V BIAS
U3
LTC3621EDCB-2
D5
+5.5V
VIN
C47
1.0uF
25V
D
5
INTVCC
6
MODE
2
JP6
FB
VIN
ON
EXTVCC
+5.5V
1
744043003
R80
187k
1%
C48
22pF
3
VOUT
COUT27
OPT
1210
R76
COUT28
OPT
1210
COUT29
OPT
1210
COUT30
OPT
1210
COUT31
OPT
1210
COUT32
OPT
1210
COUT33
OPT
1210
COUT34
OPT
1210
COUT35
OPT
1210
COUT36
OPT
1210
OPT
C38
22uF
10V
0805
D
VOUT
7
R77
10K
1%
RUN
VOUT
L5
3.3uH
4
1
R83
23.2K
1%
2
COUT37
OPT
1210
OFF
COUT38
OPT
1210
COUT39
OPT
1210
COUT40
OPT
1210
COUT41
OPT
1210
COUT42
OPT
1210
COUT43
OPT
1210
COUT44
OPT
1210
COUT45
OPT
1210
COUT46
OPT
1210
3
BIAS
1
C37
10uF
16V
0805
SW
GND
CMDSH-3-TR
2
DYNAMIC LOAD CIRCUIT
C
C
EXT PULSE
E15
VOUT
J7
SUD50N04-8M8P-4GE3
U4 LTC6992IS6-1
2
R90
3
154k
MOD
OUT
GND
V+
SET
DIV
R87
5
0
+5.5V
R91
4
1M
U5 LT1803IS5
C41
5
R88
20K
0.1uF
2
70Hz, 3% Duty Cycle
R92
20K
R85
2.2
JP7
PULSE
6
2
1
R93
681K
1%
3
C43
1.0uF
V+
VOUT
R89
4
EXT
SUD50N04-8M8P-4GE3
R94
10K
1%
J9
1
R95
301
1%
R98
0.01
2512
R100
301
1%
E16
GND
CUSTOMER NOTICE
INTVCC1
UD1 LTC6908S6-1#PBF
R104
A
OPT
1
C45
R102
237k
1%
0.1uF
2
3
V+
OUT1
GND
OUT2
SET
MOD
6
5
B
2
82.5 1%
R97
0.01
2512
R99
5K
IOUT STEP
C44
1.0uF
R96
B
2
Q20
3
INT
C42
150pF
-IN
Q21
1
VOUT
1
V+IN
3.3 1%
1
R101
EXTCLK
OPT
4
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.
MI
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG. YINGTI Y.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
TITLE: SCHEMATIC
HIGH EFFICIENCY 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
N/A
SCALE = NONE
2
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.
LTC3875EUJ / LTC3874EUFD
DEMO CIRCUIT 2142A
03/05/14 13:05:40
SHEET 3
1
REV.
2
OF 3
A
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