DC1345A - Schematic

5
4
3
2
1
VIN
VIN+
RUN
D
ON
Fsw = 300kHz, typical
R1
OPT
1
R16
OPT
3
JP1
C4
47pF
2
CCM
INTVCC
3
4
3
JP2
R8
0
R15
0
2
1
INTVCC
R9
OPT
R11
100K
PGOOD
SGND
INTVCC
ITH
BG
MODE
PGND
VRNG
SW
PGOOD
TRACK/SS
U1
LTC3879EMSE
TG
BOOST
E4
INTVCC
11
12
Q2
OPT
5
10
VINQ1
BSC093N04LSG
4
4
C6
4.7uF 16V
1
2
3
5
VIN
C1
0.1uF 50V
D1
SD103AWS
13
14
VOUT
L1
0.72uH
Worth 744325072
E7
15
Q3
BSC035N04LSG
16
R17
0
4
C8
0.1uF 50V
Q4
OPT
COUT3
COUT1
47uF
6.3V
4
C
VOUT+
VOUT
E8
5
R7
10K
ION
9
COUT2
47uF
6.3V
[email protected]
COUT4
+ 330uF
2.5V
2R5TPE330M9
+ 330uF
2.5V
2R5TPE330M9
1
2
3
6
1
DCM
7
RUN
5
C3
OPT
VFB
1
2
3
C5
OPT
1
GND
5
C
E2
4.5V - 34V
CIN1
+ 100uF
50V
SANYO, 50ME100PX
2
CIN2
10uF
35V
E3
1
2
3
INTVCC
MODE
CIN3
10uF
35V
1
8
R5
10K
CIN4
10uF
35V
R2
2.2
R3
576K
2
C7
470pF
GND
R4
10K
CIN5
OPT
C10
OPT
VIN
17
R6
20K
D
VIN
2
OFF
E1
VIN
E10
GND
VOUT-
E11
E5
TRACK
NOTE:
E6
R13
0
B
R14
OPT
Only apply load from E8 to E10.
C9
0.1uF 50V
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
CONTRACT NO.
APPROVALS
TITLE:
CHECKED:
APPROVED:
ENGINEER: Mike Sh.
DESIGNER:
4
3
SIZE
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
DRAWN: Antonina K
DATE:
2
B
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
LTC3879EMSE
NO RSENSE STEP-DOWN DC/DC CONVERTER
DWG NO.
REV
DC1345A
2
Monday, August 03, 2009
SHEET
1
1 OF 1
A
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