DC1878A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
2
DATE
PRODUTION
APPROVED
10/28/11
VIN
TAGE B.
VIN+
TP3
INTVCC
D
VAUX
INTVCC
C9
2.2uF
100V
1210
TP13
TP8
R7
100k
C5
2.2uF
100V
1210
C6
2.2uF
100V
1210
C7
OPT
1210
C8
OPT
1210
C29
OPT
1210
+
C30
OPT
1210
+
CIN1
OPT
CIN2
150uF
100V
SHT 2
B
PGOOD
TP4
SGND
VOUT1
VOUT
TP5
CSS
R9
1k 1%
3
4700pF
R10
C11
33pF
1k 1%
CC1 470pF
CC2
0.01uF
5
RC
6
14.7k 1%
PLLIN
TP10
R21
R24
10K
4
7
8
0
9
D8
BZX84C5V1
VIN
R30
64.9k
1206
RUN
1
R15 100k 1%
INTVCC
R20 100k 1%
R14
154k
1%
R22
OPT
ON
2
VOUT
OFF
3
VIN
B
JP1
R31
12.1K
10
11
12
R13
154k
1%
13
14
R25
0
SS
SW1
SENSE1+
TG1
SENSE1-
BOOST1
ITH
PGND1
SGND
BG1
MODE/PLLIN
FREQ
VIN
INTVCC
RUN
EXTVCC
VINSNS
BG2
VOUTSNS
BOOST2
ILIM
TG2
IOSENSE+
SW2
IOSENSE-
NC
R6 0
R12
27
26
D3
3
22
19
U2
2
C16
INTVCC C14
10uF 1206
D7
DFLS160
3
C24
1uF
17
16
D9
BAS16
TG1
R5
4.7
0805
4
TINP
TS
BINP
TG
VCC BOOST
BG
BG1
D2 1
NC
8
7
6
5
C1
22uF
25V
1210
SiR496DP
C12
OPT
1206
SW2
TG2
+
R8
10
Q5
SiR496DP
D5
B1100
Q4
SiR882DP
C
VOSTP1
C13
OPT
1206
R29
OPT
1206
VOUT1
C21
OPT
1210
C25
OPT
1210
C27
OPT
1210
R32
0
B
R19
OPT
CS
OPT
R18
0.012
2%
R26 10
TG1
SW1
R33 OPT
EXTVCC
BG1
TP12
BG2
R34
R4
100
R3
100
TG2
SW2
R36
OPT
CS
<------
------>
CUSTOMER NOTICE
A
CIRCUITRY ON
THIS SIDE MUST
CONNECT TO
SIGNAL GND
GROUNDPLANE
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.
CIRCUITRY ON
THIS SIDE MUST
CONNECT TO
POWER GND
GROUNDPLANE
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
MI
TAGE B.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
2
TG1
SW1
BG1
BG2
SHT 2
TG2
SW2
CS
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
8V - 75V VIN BUCK-BOOST DC/DC
CONVERTER
SIZE
5
C28
OPT
1210
16V
D10 VOUT
4.7uF
OPT
GND
J2
BG2
R1 5.6
0805
VOS+
TP2
L1
SW1
0.22uF
16V
VOS+
D6
B240A
19uH
C4
12V / 5A MAX
15
C10
R35
OPT
J1
+
C3
C23 COUT1 COUT2
OPT OPT 330uF 330uF
16V
1210 1210 16V
OPT
Q3
R28
OPT
1206
VOUT
0.010
2%
BAS16
R50
0 C22
0.22uF
18
3
0.1uF
C18
0.1uF
Q2
SiR870DP
LTC4444EMS8E-5
0
OPT
21
20
R11 INTVCC
1
23
3
BAS21
1
D11
24
INTVCC
OPT
OPT
25
1
C15
1uF
16V
0805
25V
1210
1
2
PGOOD
28
D4
3
OPT
VFB
8V
GND
1
C2
22uF
VAUX
U1
LTC3789EGN
CF
OPT
SS
C
TP7
R2
9
RFB1
113K
GND
GND
TP11
8.06K
CF1
8V - 75V
J4
VOS+
RFB2
D
VIN
J3
N/A
SCALE = NONE
IC NO.
LTC3789EGN
REV.
DEMO CIRCUIT 1878A
DATE: Friday, March 02, 2012
SHEET 1
1
2
OF 2
A
5
4
3
AUXILIARY SUPPLY
8V / 50mA
VIN
D13
R39
BZX84C6V8 100k 1%
Q6
1206
MMBTA42-7
D
R27
0 D15
VAUX1
VIN
GND
R41
VAUX1
3
1.58k 1%
R37
VFB=0.8V
VCC
SNS
5
8
4
6
5
2
1
6
3
1
G
7
C19
5
4
D14
1uF 16V
R48
CLAMPING SNUBBER/ 400uA SUPPLY
BAS21
R47
3
1
ITH/RUN
22.1k 1% 1000pF
2
D
1
4
C17
R38
220k
1206
T1
2 PA0648NL
DFLS1100
C20
10uF
10V
1206
Q1
FDC2512
1
U3
LTC3803ES6-5
D12
BAS16
3
R40
OPT
R44
100
1
VAUX
VIN
C31
2
5.6k 1%
R43
0.30
1%
1206
14k 1%
C
R42 10 1%
C26
VIN 0.1uF
R46
33.2k
1%
33.2k 1%
Q9
MMBTA92-7
R45
24.9k
1%
C
R16
B SHT 1
0
VAUX
OPTIONAL BIAS SUPPY
U4
LTC3630EMSE
SiR496DP
SW1
SHT 1
BG1
SHT 1
SW2
BG2
SW2
Q13
SiR496DP
BG2
R51
OPT
ON
VFB
RUN
R49
0
5
11
R23
OPT
C32
OPT
VPRG1
OV
VPRG2
FBO
ISET
SS
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.
APP ENG.
5
4
3
2
C34
0.1uF
B
R55
7
0
R56
6
0
10
C35
47nF
TECHNOLOGY
MI
TAGE B.
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
8V - 75V VIN BUCK-BOOST DC/DC
CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C36
47uF
10V
1210
R54
11.3k
1%
APPROVALS
PCB DES.
C37
OPT
9
OFF
12
CS
CS
14
JP2
GND
SW1
Q15
SiR882DP
BG1
SW
GND
1
B
BIAS RUN
R53
102k
1%
TDK VLF10040
1
17
TG2
22uH
C33
3
VIN
2.2uF
100V
1210
NC
TG2
R52
2M
1%
8
16 GND
TG1
TG1
L2
VIN
Q8
2
4 NC
13 NC
15 NC
VOUT1
VIN
3
Q14
SiR870DP
2
OPTIONAL PARTS
R17
OPT
0805
N/A
SCALE = NONE
IC NO.
LTC3789EGN
REV.
DEMO CIRCUIT 1878A
DATE: Friday, March 02, 2012
SHEET 2
1
2
OF 2
A
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