DC1757A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
DESCRIPTION
2
R7
100K
PGOOD
C35
3.3uF
50V
(OPT)
1210
+
C14
3.3uF
50V
(OPT)
1210
J1
+
CIN1
270uF
50V
VIN+
CIN2
270uF
50V
TP7
R5
SGND
TP11
G
ITH
2
TP5
TP6
OPT
R15
JP1 VIN+
RUN
1
R30
ON
2
3
OFF
R9
100
3
R10
100
C11
68pF 4
CC1
D8
BZX84C5V1
41.2K
CC2
RC
0.01uF
10K
INTVCC
PULSE SKIP
CCM
1
R22
OPT
2
R16 1K
PLLIN
EXTVCC
8
C7
OPT
C8
OPT
9
10
11
12
3
R24
10K
B
7
10K
INTVCC
5
6
R21
R31
12.1K
JP2
MODE
100pF
13
R25
0
R14
100
R13
100
VOUT
TP10
C10
2.2uF
14
SS
PGOOD
SW1
SENSE1+
TG1
SENSE1-
BOOST1
ITH
SGND
MODE/PLLIN
FREQ
RUN
VINSNS
VOUTSNS
PGND
BG1
VIN
INTVCC
EXTVCC
BG2
BOOST2
ILIM
TG2
IOSENSE+
SW2
IOSENSE-
TRIM
27
S
VFB
28
26
R23 0
25
R11
C4
0.22uF
16V
0
23
D4
DFLS160
R27 0
22
INTVCC
24
C12
(OPT)
1206
R17 0
21
C24
20
1uF
16V
Q4
BSC027N04LS
Q7 (OPT)
L1 1.5uH
D
D6
B340A
C28
C21
C20
C19
C17
C16
22uF
16V
1210
J2
R2 0.003
C32
C31
C30
C29
C23
(OPT)
1210
J3
1W
2512
+ COUT1
330uF
16V
+ COUT2
G
D5
B340A
GND
GND
VOUT
12V @ 12A MAX
R8
10
VOS+
330uF
16V
TP2
L2
VIN
6V - 36V
VOUT
VOS+
1.5uH
XAL1010-152ME
C
XAL1010-152ME
D
SS
1
S
CF1 OPT
CSS
0.1uF
S
LTC3789EGN
R28
(OPT)
1206
Q3
BSC010NE2LS
Q8
(OPT)
G
Q9
Q5
BSC010NE2LS
TP1
D
Q2
Q6
BSC027N04LS
U1
C13
(OPT)
S
CF
OPT
VOUT1
D
RFB1
113K
RFB2 8.06K
5.1
C15
0.1uF
50V
VIN+
D
TP4
VOS+
C
R20 0
C9
C25
C26
C27
3.3uF
50V
1210
DATE
CHARLIE Z. 6-9-11
TP3
INTVCC
D
APPROVED
PRODUCTION
R29
(OPT)
J4
G
C18 10uF
6.3V
D7
DFLS160
VOS-
GND
R1 0
19
18
C22
0.22uF
16V
17
16
15
R26 10
VIN+
VOUT
B
R18
0.01
1W
0805
R19
0.01
1W
R32
0.01
1W
R6 OPT
TP12
R12 OPT
R4
100
R3 100
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
A
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.
2. INSTALL SHUNTS AS SHOWN.
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
HZ
CHARLIE Z.
TITLE: SCHEMATIC
HIGH EFFICIENCY 12V / 12A BUCK-BOOST CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
N/A
SCALE = NONE
DATE:
IC NO.
LTC3789EGN
DEMO CIRCUIT 1757A
Monday, October 10, 2011
REV.
2
SHEET 1
1
OF 1
A
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