DC2225A - Schematic

5
4
3
2
1
REVISION HISTORY
R1 20K
VIN
R2
OPT
__
1
APPROVED
PRODUCTION
JIAN L.
1
2
4
JP2
VIN
R3
OPT
VIN+
6
3
B
TRSET2
TG2
C18
0.1uF
D2
CMDSH-3
9
4
2
COUT1
100uF
6.3V
1206
+ COUT2
470uF
2.5V
7343
+ COUT4
C10
100uF
6.3V
470uF
2.5V
7343
VO_SNS+
J5
J3
VOUT
C11
100uF 1.0V
6.3V
J4
/ 160A
GND
J6
Q2
BSG0811ND
VO_SNS-
R20 10
E8
C
GND
VO_SNS-
VIN
Q3
BSG0811ND
SW2
CIN4
22uF
1206
BG2
CIN5
22uF
1206
5
6
7
2
VIN
L2
8
R33
OPT
R28
INTVCC1
Q4
BSG0811ND
1
2
8
R43 4.99k
COUT7
100uF
6.3V
1206
0.25uH
744301025
DCR = 0.32m OHM
5
6
7
10
TAVG
INTVCC1
1
R40 10k
2
1
20
100K
TAVG
9
10
3
21
3
R37 10k
COUT3
100uF
6.3V
1206
VIN-
8
10
TRSET1
2
SW1
C14
4.7uF
25V
SW2
R32
100K
1%
E7
R23 0
RUN
R31
OPT
5
6
7
1
10
22
GND
VOUT
9
PGOOD
ENTMPB
IFAST
RUN2
SW2
C13
1uF
J2
E6
0.25uH
744301025
DCR = 0.32m OHM
VIN
INTVCC1
EXTVCC
4.5V - 14V
+
VO_SNS+
VIN
25
23
CIN1
270uF
16V
R12
715
1%
R11
3.57k
1%
R18 2.2
26
+
8
CMDSH-3
24
CIN9 CIN12
22uF 270uF
1206 16V
L1
INTVCC1
D1
BG1
CIN8
22uF
1206
R16 10
4
220nF
TG2
R17 0
19
R27 OPT
18
SGND/PGND
C19
3
BOOST2
SNS2-
27
2
0.1uF
TG1
28
CIN2
22uF
1206
CIN7
22uF
1206
5
6
7
1
C7
30
29
CIN3
22uF
1206
9
CLKOUT
31
32
33
RUN1
PHASMD
MODE/PLLIN
TRSET1
34
TCOMP1
36
35
38
SNS1-
SNSA2+
17
41
BG2
IFAST1
C22
1uF
E13
10
TK/SS2
ENTMPB
E12
C16
220nF
EXTVCC
VOSNS2-
16
R22
OPT
EXTVCC
VIN
INTVCC
FREQ
9
TG1
BG1
VOSNS2+
TRSET2
8
SW1
BOOST1
ITH2
15
7
CLKOUT
SW1
ITH1
14
6
TRSET2
5
ITH
TCOMP2
C9
680pF
SNSD2+
R15
707
1%
VOSNS1-
13
C
4
CLKOUT
U1
LTC3875EUJ
12
ITH
VOSNS1+
TAVG
3
C8 10nF
TK/SS1
TCOMP2
2
SNSD1+
40
1
SNSA1+
TK/SS
39
C6
OPT
11
R14
20k
Q1
BSG0811ND
ILIM1
ILIM
220nF
TRSET1
37
220nF
VO_FB
VO_SNS-
R10
2K
4
R7
OPT
C4
CIN6
22uF
1206
VIN
INTVCC1
4
OPT
C3
R9 2K
3
OPT
C5
OPT
R13
13.3k
VO_SNS+
C2
0.1uF
R8
TCOMP1
R6
OPT
R5
TAVG
R4 0
1
VIN
TK/SS
E5
GND
D
E4
VIN
J1
TRK/SS
EXTVCC
DATE
3-20-14
INTVCC1 120 90
4
1
C1
OPT
2
DESCRIPTION
PHASMD
60
DEG DEG DEG
JP1
PLLIN
RUN
ON
5
OFF
D
2
E3
SW1
RUN
REV
4
3
RUN
1
3
MODE
PS BM CCM
INTVCC1
E1
ECO
COUT8
100uF
6.3V
1206
COUT5
+ 470uF
2.5V
7343
COUT6
C20
100uF
6.3V
+ 470uF
2.5V
7343
C21
100uF
6.3V
B
R34
3.57k
1%
R35
715
1%
C26 OPT
TCOMP1
ENTMPB
C24
OPT
2
2
C23
OPT
R45
OPT
R42
OPT
1
RN2
OPT
CUSTOMER NOTICE
A
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.
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
HZ
JIAN L.
4
3
2
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
TITLE: SCHEMATIC
HIGH EFFICIENCY, SINGLE-OUTPUT SYNCHRONOUS BUCK
CONVERTER WITH VERY LOW DRC INDUCTOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
PGOOD
PGOOD
R39
OPT
R41
OPT
1
RN1
OPT
E14
PGOOD
TCOMP2
R38
OPT
DATE:
IC NO.
LTC3875EUJ
REV.
DEMO CIRCUIT 2225A
Wednesday, December 09, 2015
1
1
SHEET 1
OF 3
A
5
4
3
2
1
REVISION HISTORY
ECO
REV
__
DESCRIPTION
1
APPROVED
PRODUCTION
JIAN L.
DATE
3-20-14
CLKOUT
E20
R64OPT
INTVCC2
R69
OPT
RUN
D
D
B
TRSET4
20
TG4
C28
0.1uF
TAVG
9
4
1
2
COUT22
100uF
6.3V
1206
470uF
2.5V
7343
+ COUT12
C41
100uF
6.3V
470uF
2.5V
7343
C50
100uF
6.3V
C
8
INTVCC2
VIN
Q7
BSG0811ND
SW4
CIN16
22uF
1206
BG4
PGOOD
COUT9
100uF
6.3V
1206
+ COUT10
Q6
BSG0811ND
5
6
7
1
PGOOD
SW4
ENTMPB
CIN15
22uF
1206
2
VIN
L4
8
3
R36
OPT
R75 10k
Q8
BSG0811ND
1
5
6
7
2
8
R44 4.99k
COUT21
100uF
6.3V
1206
0.25uH
744301025
DCR = 0.32m OHM
9
21
D4
CMDSH-3
10
TAVG
R55 10k
2
SW3
C45
4.7uF
25V
10
22
5
6
7
1
10
TRSET3
R73
100K
1%
9
10
3
C44
1uF
VIN
+
R61 0
RUN
R66
OPT
VIN
INTVCC2
EXTVCC
CIN10
270uF
16V
VOUT
0.25uH
744301025
DCR = 0.32m OHM
VIN
25
23
+
R29
715
1%
R52
3.57k
1%
R24 2.2
26
24
CIN20 CIN13
22uF 270uF
1206 16V
L3
INTVCC2
D3
CMDSH-3
BG3
CIN19
22uF
1206
8
4
PGOOD
TG2
SW2
R19 0
28
27
0.1uF
TG3
19
ENTMPB
IFAST
RUN2
18
220nF
17
R70 OPT
ENTMPB
SGND/PGND
C29
3
BOOST2
SNS2-
30
29
CIN18
22uF
1206
5
6
7
2
C48
CIN14
22uF
1206
9
CLKOUT
31
32
33
RUN1
PHASMD
MODE/PLLIN
TRSET3
34
TCOMP3
36
38
35
ILIM
TRSET1
37
SNSD1+
TCOMP1
SNS1-
SNSA2+
IFAST2
41
BG2
16
C27
1uF
C47
220nF
TK/SS2
FREQ
EXTVCC
10
EXTVCC
VOSNS2-
TRSET2
R71
OPT
VIN
INTVCC
15
9
BG1
VOSNS2+
TAVG
8
TG1
BOOST1
ITH2
TCOMP2
7
SW1
CIN11
22uF
1206
1
SW3
ITH1
14
6
13
5
ITH
U2
LTC3875EUJ
VOSNS1-
TAVG
C43
47pF
VOSNS1+
Q5
BSG0811ND
ILIM2
TRSET4
C
4
SNSA1+
40
ITH
SNSD2+
3
VO_SNS-
12
2
VO_FB
TK/SS1
11
1
39
220nF
TCOMP4
TK/SS
R57
2K
CLKOUT
C42
220nF
TK/SS
R67
OPT
OPT
C30
CIN17
22uF
1206
VIN
INTVCC2
4
OPT
R562K
4
R68
3
R65
2
1
VIN
COUT11
100uF
6.3V
1206
COUT13
+ 470uF
2.5V
7343
COUT14
+ 470uF
2.5V
7343
C46
100uF
6.3V
C25
100uF
6.3V
B
R63
3.57k
1%
R62
715
1%
C40 OPT
TCOMP3
TCOMP4
R47
OPT
R50
OPT
C39
OPT
R49
OPT
RN5
OPT
1
R46
OPT
1
RN6
OPT
2
2
C32
OPT
CUSTOMER NOTICE
A
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.
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
HZ
JIAN L.
TITLE: SCHEMATIC
HIGH EFFICIENCY, SINGLE-OUTPUT SYNCHRONOUS BUCK
CONVERTER WITH VERY LOW DRC INDUCTOR
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
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
REV.
DEMO CIRCUIT 2225A
Wednesday, December 09, 2015
1
1
SHEET 2
OF 3
A
4
3
VIN
VIN
12
11
10
C31
10uF
16V
JP5
BIAS
ON
9
R51
10K
8
7
3
D
2
1
U3
LT1763CDE
OPTIONAL 5.5V BIAS
2
NC
NC
IN
OUT
IN
OUT
NC
NC
SHDN
GND
EXTVCC
R48
OPT
3
R54
34.8K
1%
4
5
C35
10uF
16V
D
6
BYP
R53
10K
1
13
OFF
+5.5V
1
2
ADJ
GND
5
LOAD STEP CIRCUIT
+
COUT15
OPT
7343
+
COUT16
OPT
7343
+
COUT19
OPT
7343
+
C38
OPT
6.3V
1210
COUT20
OPT
7343
1
C37
OPT
6.3V
1210
C33
1uF
Q21
SUD50N03-09P
VOUT
Q20
SUD50N03-09P
1
3
1
3
J10
1
E18
C34
0.22uF
5
4
3
2
IOUT
J9
C
4
2
C
+
COUT18
OPT
7343
2
3
4
5
+
COUT17
OPT
7343
4
2
VOUT
R60
0.005
2512
R58
OPT
2512
IOSTEP CLK
R59
10K
E19
GND
B
B
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
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
A
TECHNOLOGY
HZ
JIAN L.
TITLE: SCHEMATIC
HIGH EFFICIENCY, SINGLE-OUTPUT SYNCHRONOUS BUCK
CONVERTER WITH VERY LOW DRC 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
REV.
1
DEMO CIRCUIT 2225A
Wednesday, December 09, 2015
SHEET 3
1
OF 3
A
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