DC882A - Schematic

5
4
3
2
1
REVISION HISTORY
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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
Applications Engineering for assistance.
ECO
REV
DESCRIPTION
1
D
DATE
PROTO
D
Q2 Si9803DY
OPT [1]
VIN
1
2
3
JP1
4
C6
10uF
10V
C13
10uF
10V
6
0.1uF
10V
JP3
U1
LTC3809EDD-1
C
TG
C12
1
OPT [1] OPT [1]
OPT
4
L1
[1]
8
2
4
R5
Q3
Si9804DY
3
VIN
FORCED CONTINUOUS
SW
C10
10
C
SD14-1R5
L2
MODE
SW
VOUT
IHLP-2525CZ-01-1.5
OPT
OPT [1]
[1]
RUN
C5
22uF
6.3V
C9
10uF
6.3V
TP6
VOUT
[email protected]
C2
+ 150uF
4V
TP10
OPT
TP4
5
GND
5
6
7
8
PULSE-SKIPPING
TP2
1
2
3
JP2
9
R11 100K
VFB
[1]
VIN
2.75V-9.8V
C7
10uF
10V
OPT
TP1
5
6
7
8
Q1 FDC6020C
1
5
BURST
C1
APPROVED
12/08/04
[1]
GND
RUN
BG
7
VIN
TRACK
TP5
R9
R8
1.18K 1%
JP4
1
R12
10K
590 1%
TRACK
VIN
SOFT
START
R3
1
2
3
2
TRACK/SS
IPRG
VFB
2
VFB
3
ITH
4
OPT
C4 470pF
[1]
11
0
IPRG
6
C8
GND
B
C11
R2
100pF
15K
R4
59K
1%
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
A
THIRD ANGLE PROJECTION
NOTES: UNLESS OTHERWISE SPECIFIED,
[1]
C3 150pF
CONTRACT NO.
APPROVALS
DRAWN
MEI
DATE
12/08/04
CHECKED
TECHNOLOGY
TITLE
DESIGNER
SIZE CAGE CODE
DWG NO
REV
1
DC882A
DO NOT SCALE DRAWING
4
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCH, LTC3809EDD-1, SYNCHRONOUS STEP-DOWN
CONVERTER WITH OUTPUT TRACKING
ENGINEER
2. WHEN USING LTC3809EDD WITH SPREAD SPECTRUM MODE, SELECT "SOFT
START", R3=300K; JP1, JP2 AND JP3 ARE OPEN; C12=2200pF, R5=0,
C10=1000pF.
3
B
TP9
APPROVED
DO NOT STUFF (OPTIONAL).
5
R6
118K 1%
Wednesday, May 18, 2005
SCALE: NONE
2
FILENAME: 882A-1.DSN
SHEET
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OF
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