DC1896A - Schematic

5
4
3
2
1
REVISION HISTORY
INTVCC
ECO
E10
REV
CVCC1 1uF
CTR1
4700pF
TRACK/SS1
2
3
TRACK
D
E9
02/11/13
1uF
TOM G.
SS
2
3
TRACK
D
JP4
E11
RTR2 0
TRACK1
TRACK2
RTR3
OPT
RTR4
OPT
VIN1
VIN2
RPG1
100K
RPG2
100K
E1
E8
PGOOD1
PGOOD2
INTVCC
PHASE
RUN1
SVIN RUN2
1
L1 1.0uH
VOUT1
VOUT1
3A
COUT5
10uF
6.3V
0805
E6
GND
COUT3
22uF
6.3V
1206
COUT1
22uF
6.3V
1206
E15
C1
0.1uF
26
27
VISHAY
IHLP-2020BZER1R0M01
28
R3
34.8K
1%
CFFW1
10pF
3
R5 23.2K 1%
GND
1
1
1.5V
4
3
1.8V
6
R7 17.4K 1%
2.5V
5
JP6
11
PGOOD2
18
19
TRACK/SS2
PVIN2
PVIN2
13
21
2
INTVcc
LTC3633AEFE-3
SW1
SW1
SW2
SW2
VON1
VON2
VFB1
VFB2
ITH1
RITH1
13K
1%
R2 1M
ITH2
ON
2
3
9
R9 11K
1%
EXT
2
3
INT
VIN1
VIN1
D2
20
17
16
C2
0.1uF
22uF
25V
7343
CIN1
22uF
25V
1210
1MHz
VIN1
[1]
+ CIN6
22uF
25V
7343
VIN2
CIN4
22uF
25V
1210
OPT
COUT2
22uF
6.3V
1206
15
R4
84.5K
1%
CFFW2
10pF
14
RITH2
13K
1%
CC2
10pF
OPT
220pF
220pF
3
COUT6
10uF
6.3V
0805
3A
E7
GND
GND
JP15
E14
2.5V
ITH2
R6 18.7K 1%
1
2
VOUT2
COUT4
22uF
6.3V
1206
R10 26.7K 1%
CITH2
EXT
JP5
VO2 SELECT
3.3V
INT
R8 11.5K 1%
JP7
B
JP13
5V
INTVCC
MODE
2
2
1
3
4
3
6
5
INTVCC
JP14
RT
324K
1%
BURST MODE
SYNC
E12
SYNC
FCM (FORCED CONTINUOUS MODE)
JP8
R12
OPT
R11
10k
CIN2
22uF
25V
1210
CUSTOMER NOTICE
NOTES: UNLESS OTHERWISE SPECIFIED,
[1] CIN5 AND CIN6 ARE INSERTED ON DC1896A 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.
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
VOUT2
VISHAY
IHLP-2020BZER2R2M01
12
CSVIN1
1uF
E5
OPT
CITH1
VIN2
E16
VIN2
3.6V - 20V
2MHz
(INT.)
CSVIN
1uF
INTVCC
L2 2.2uH
1
CIN3
22uF
25V
1210
OPT
C
E13
INTVCC
[1]
+ CIN5
VIN2
CMDSH-3-TR
SVIN
FREQ
3.6V - 20V
D3
CMDSH-3-TR
23
INTVCC
JP12
D4
VIN1
JP2
RUN2
GND
SVIN
OFF
1
B
E2
CC1
10pF
OPT
ITH1
BOOST2
U1
8
2
BOOST1
RT
VO1 SELECT
SVIN
MODE/SYNC
22
OPT
RUN2
PHMODE
7
D1
INTVCC
E4
RUN1
PGND
5
29
6
RUN1
TRACK/SS1
JP1
C
SGND
JP11
4
3
OFF
10
3
2
E3
1
R1 1M
25
24
ON
PGOOD1
RPHMDE 1M
2
OFF
SVIN
PVIN1
PVIN1
1
ON
A
APPROVED
TRACK/SS2
JP3
RTR1 0
DATE
PROD
1
INTVCC
SS
CTR2
4700pF
CVCC
1
DESCRIPTION
1
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.
LTC3633AEFE-3
DEMO CIRCUIT 1896A
05/03/13 12:32:05
SHEET 1
1
REV.
1
OF 1
A
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