DC1235A - Schematic

5
4
3
PGOOD1
2
INTVCC
TP1
TP2
1
EXTVCC
TP3
R1
D
Vout2
D
(Opt)
C1
+
C24
39pF
R2
68.1K
1%
3
0
R9
0
4
JP2
PLLIN/MODE
CCM
1
R8
(Opt)
C5
1000pF
C7
R12 100pF
9.09K
1%
TP8
PLLIN/MODE
C8 100pF
C9
10K
1000pF
2
3
JP4
RUN2
1
2
OFF
C15
R17
78.7K
1% C16
3
470pF
100pF
C17
R21
TP15
SGND
JP5
TRACK1
SS1
1
2
TRACK
3
C22
0.1uF
R25
35.7K
1%
R26
11.5K
1%
JP6
TRACK2
SS2
1
2
TRACK
3
TRACK1
1
ITH1
TRACK/SS1
28
2
VFB1
PGOOD1
27
TG1
26
SW1
25
BOOST1
24
SENSE1+
4
SENSE1-
5
PLLLPF
R19
0
C21
R24
39pF
0
L1
R6
2.2uH
CDEP105-2R2M
0.012
1%
TP4
VOUT1
Vout1
COUT1
+ 150uF
10V
C2
10uF
10V
[email protected]
4.7uF
LTC3826EG-1
6
PLLIN/MODE
BG1
23
7
SGND
VIN
22
8
RUN1
PGND
21
9
RUN2
EXTVCC
20
10
SENSE2-
INTVCC
19
11
SENSE2+
BG2
18
BOOST2
17
12
VFB2
13
ITH2
SW2
16
14
TRACK/SS2
TG2
15
TP6
GND
C6
0.1uF
*
TP7
VIN
4.5V-32V
R13
0
D1
Q2
Si7848DP
CMDSH-4E
R15 10
R16
C12
0
R18
D4
0
C18
0.1uF
C10
10uF
C
TP9
GND
D3
B140
C13
10uF
4.7uF
10V
CMDSH-4E
*
9Vin required for
8.5Vout
regulation
D2
B140
C11
0.1uF
C14
Q3
Si7848DP
47uF
35V
1000pF
22.1K
1%
R23
215K
1%
B
Q1
Si7848DP
C3
3
680pF
R14
JP3
RUN1
ON
1
ON
R7 200K
TRACK1
U1
3
OFF
R10
0
C4
2
BURST
C
R4
+
250KHz
390KHz
R3
215K
1%
4.7uF
10V
+
JP1
FREQ
1
530KHz
2
Q4
Si7848DP
R20
0
L2
7.2uH
CDEP105-7R2M
R22
0.015
1%
TP11
VOUT2
Vout2
[email protected]
+
COUT3
150uF
10V
C20
10uF
10V
B
TP12
GND
TP13
Track1
R27
Vout2
(Opt)
C23
0.1uF
R28
(Opt)
TRACK2
TP14
Track2
R29
(Opt)
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
CONTRACT NO.
APPROVALS
DRAWN
DATE
HELEN
3/09/07
CHECKED
TECHNOLOGY
TITLE
A
LTC3826EG-1 Wide Output Range
Dual-Output Synchronous Step Down Supplies
APPROVED
ENGINEER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
George Yu
3/09/07
DESIGNER
Tuesday, October 02, 2007
2
SIZE
CAGE CODE
SCALE:
FILENAME:
DWG NO
REV
A
DC1235A
SHEET
1
1
OF
1
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