DC1347B - Schematic

5
4
3
2
1
REVISION HISTORY
INTVCC
E10
ECO
REV
CVCC1
DESCRIPTION
1
CTR1
4700pF
TRACK/SS1
1uF
CVCC
E9
INTVCC
1uF
3
SS
2
3
JP3
RTR1 0
TOM G.
1
2
TRACK
APPROVED
05/16/11
TRACK/SS2
1
SS
D
DATE
PRODUCTION
CTR2
4700pF
TRACK
D
JP4
E11
RTR2 0
TRACK2
TRACK1
RTR3
OPT
RTR4
OPT
VIN
VIN
RPG1
100K
RPG2
100K
E1
E8
PGOOD2
PGOOD1
INTVCC
PHASE
RUN1
1
VIN
2
D1
20
INTVCC
VISHAY
IHLP-2020BZER1R0M01
COUT1
22uF
6.3V
1206
5
1.8V
CC1
10pF
OPT
R7 19.6K 1%
ITH1
ITH1
RITH1
13K
1%
EXT
D2
FB2
ITH2
2.2uH
VISHAY
IHLP-2020BZER2R2M01
COUT2
22uF
6.3V
1206
12
CFFW2
9
R4
84.5K
1%
10pF
VOUT2
COUT4
22uF
6.3V
1206
COUT6
10uF
6.3V
0805
3A
E7
GND
E14
11
R10 26.7K 1%
RITH2
13K
1%
GND
JP15
2.5V
CC2
10pF
OPT
ITH2
R6 18.7K 1%
JP5
1
EXT
CITH1
CITH2
2
220pF
220pF
3
3.3V
INT
R8 11.5K 1%
JP7
5V
INTVCC
MODE
1MHz
2MHz
(INT.)
B
JP13
INTVCC
1
CIN1
47uF
16V
1210
E5
VOUT2
0.1uF
FREQ
CIN3
47uF
16V
OPT
1210
CLDO
1uF
OPT
OPT
INTVCC
JP12
VIN1
[1]
+ CIN5
22uF
35V
7343
C2P5
1uF
INTVCC
CBST2
3
INT
3.6V - 15V
V2P5
17
14
13
C
E13
18
2
R9 14.7K 1%
E2
JP2
6
LTC3633EUFD
JP6
VIN
GND
OFF
U1
1
B
8
15
16
PVIN2
PVIN2
19
10
27
FB1
MODE/SYNC
6
3
4
1.5V
VON2
RT
1.2V
3
VON1
5
1
4
SW2
SW2
PGND
28
10pF
VOLTAGE SELECT
2
ON
2
CFFW1
26
GND
SW1
SW1
29
E15
23
24
25
R3
29.4K
1%
R5 29.4K 1%
GND
1M
L2
0.1uF
COUT3
22uF
6.3V
1206
BOOST2
GND
E6
COUT5
10uF
6.3V
0805
V2P5
BOOST1
R2
L1 1.0uH
OPT
VOUT1
3A
RUN2
PHMODE
7
E4
CBST1
RUN1
PGOOD2
3
TRACK/SS2
JP1
INTVcc
JP11
C
TRACK/SS1
3
OFF
PGOOD1
1M
1
2
3
E3
1
R1 1M
21
22
ON
PVIN1
PVIN1
RPHMDE
2
VOUT1
RUN2
1
ON
OFF
VIN
2
2
1
BURST MODE
3
4
3
SYNC
6
5
FCM (FORCED CONTINUOUS MODE)
INTVCC
JP14
VIN
RT
324K
1%
E16
E12
SYNC
R11
10k
JP8
VIN2
3.6V - 15V
[1]
+ CIN6
22uF
35V
7343
CIN4
47uF
16V
OPT
1210
CIN2
47uF
16V
1210
CUSTOMER NOTICE
NOTES: UNLESS OTHERWISE SPECIFIED,
A
[1] CIN5 AND CIN6 ARE INSERTED ON DC1347 TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE
TO THE USE OF LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES,
CIN5 AND CIN6 ARE NOT NEEDED.
2. ALL RESISTOR AND CAPACITOR CASE SIZE ARE 0402.
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
APPROVALS
TECHNOLOGY
PCB DES. MI
APP ENG. TOM G.
TITLE: SCHEMATIC
SIZE
N/A
SCALE = NONE
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
DUAL SYNCHRONOUS STEP-DOWN
REGULATOR
IC NO.
LTC3633EUFD
DEMO CIRCUIT 1347B
Monday, May 16, 2011
SHEET 1
1
REV.
1
OF 1
A
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