DC1574A - Schematic

A
B
C
D
J5
COMP
INT EXT
3
1
PGOOD
TP3
2.25V - 5.5V
GND
+
CIN3
100uF
10V
CIN4
100uF
opt.
CIN2
22uF
6.3V
CIN1
22uF
6.3V
RFILT1
24
LTC3612EFE
3
U1
15
16
20
1
PVin
PVin
PVin_d
SVin
CFILT1
1uF
SW
SW
SW
SW
19
17
14
12
Ith
6
3
TP2
TP7
100k
1%
EXT SS 5
INT
SYNC
1
2
Rt
3
4
EXT
SYNC
5
6
RT2
opt.
1%
RTR2
opt.
1%
4
6
Vfb
5
R2
R3
RM1
4.87M
1%
SYNC
FCM
1
2
PSM
3
4
BMEC
5
6
BM
7
8
1
2
ON
3
4
OFF
R4
36.5k
1%
R6
RM5
opt.
1%
COUT2
33uF
6.3V
COUT3
100uF
6.3V
opt.
COUT4
100uF
6.3V
opt.
COUT5
+ COUT6
10uF
100uF
6.3V
opt.
TP5
CITH1
1000pF
GND
CFF1
22pF
3
JP1
R1
165k
1%
1.2V
JP2
1.8V
Voutset
JP3
2.5V
JP4
3.3V
JP5
RM3
301k
1%
TP6
USER SELECT
J9
1
GND
2
RM4
100k
1%
3
TP9
GND
SET EXT
VBMCV
(Vout Burst Mode Clamp Voltage)
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.
BMECV
TP10
(Burst Mode External
Clamp Voltage)
A
VOUT
3A
opt.
CUSTOMER NOTICE
1
C1
10pF
52.3K
1%
R5
RM2
4.87M
1%
J1
MODE
CC1
opt.
COUT1
33uF
6.3V
RITH1
15k
1%
82.5K
1%
RT1
165k
1%
4
TP4
165K
1%
J4
DDR
2
(BURST MODE)
2
NC
NC
NC
CSS1
0.01uF
J6
Rt / SYNC
TP8
(FORCED CONTINUOUS
MODE)
(PULSE-SKIP MODE)
(BURST MODE EXTERNAL
CLAMP)
DDR
PGND
RTR1
INT SS 1
TRACK 3
Track/SS
8
SGND
TRACK
J3
TRACK/SS
18
13
11
10
3
RSS1
4.87M
1%
Mode
1
RSD1
4.87M
1%
7
4
J2
Run
21
2
Rt/Sync
2
9
RUN
ON
OFF
L1
0.47uH
VISHAY
IHLP2020BZERR47M01
2
TP1
VIN
2
RPG1
100k
5%
PGood
4
E
B
C
CONTRACT NO.
APPROVALS
DRAWN
Antonina K.
DATE
7/21/09
CHECKED
DESIGNER
LTC3612EFE
1
3A MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR
APPROVED
ENGINEER
TECHNOLOGY
TITLE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
T. Gross
7/21/09
SIZE CAGE CODE
Wednesday, August 05, 2009 SCALE:
FILENAME:
D
DWG NO
REV
A
DC1574A
SHEET
1
E
OF
1
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