DC1289A - Schematic

5
4
3
2
1
RUN
VIN
2
3
Fsw = 430kHz, typical
MODE
0
INTVCC
3
1
DCM
2
CCM
3
C
2
R8
0 Ohm
1
JP2
INTVCC
R9
OPT
ION
VIN
SGND
INTVCC
ITH
BG
MODE
PGND
VRNG
SW
PGOOD
TRACK/SS
U1
LTC3879EUD
C6
4.7uF 16V
11
12
14
15
BOOST
16
4
D1
CMDSH-3
13
TG
Q2
OPT
GND
E3
5
Q1
RJK0305DPB
INTVCC
10
5
9
VIN-
4
E4
VOUT
L1
0.36uH
Vishay,IHLP4040DZ-01
E7
Q3
RJK0330DPB
R16
0
4
C8
0.1uF 16V
VOUT+
VOUT
E8
Q4
OPT
COUT1
100uF
6.3V
4
COUT2
100uF
6.3V
+
COUT3
330uF
2.5V
+
[email protected]
COUT4
330uF
2.5V
C
E10
R11
100K
PGOOD
D
1
2
3
5
4
R7
20K
CIN1
+ 180uF
5
R15
C7
220pF
4.5V-14V
1
2
3
INTVCC
6
RUN
1
2
3
R6
18.2K
7
VFB
5
C5
OPT
E2
C10
OPT
2
R5
10K
8
1
C4
47pF
C11 OPT
C3
OPT
16V
PGND
R3
402K
17
R4
10K
C2
10uF
16V
C1
1uF 16V
JP1
E1
VIN
1
2
3
D
ON
OFF
VIN+
VIN
R2
2.2
1
GND
VOUT-
E11
E5
NOTES:
TRACK
E6
R13
0
Only apply load from E8 to E10
R14
OPT
C9
0.1uF
B
B
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
DATE:
2
LTC3879EUD
NO RSENSE STEP-DOWN DC/DC CONVERTER
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
DRAWN: Antonina K
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DWG NO.
REV
DC1289A
2
Monday, January 19, 2009
SHEET
1
1 OF 1
A
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