DC1290A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
2
*
D
ASSY
VIN
VOUT
FREQ
L1
C4
-A
-B
5V - 26V
15A
10A
500kHZ
0.39uH
2200pF
330kHZ
1.1uH
4700pF
5V - 36V
R1
R2
R3
R5
R7
2.15K
73.2K
2.2
1K
1.50K
31.6K
4.7
2K
3.6K
1.62K
DESCRIPTION
RS2
Q1
Q2
38.3K
0 OHM
57.6K
200 OHM
RJK0305DPB
BSC093N04LSG
RJK0330DPB
BSC016N04LSG
R9
PRODUCTION
APPROVED
DATE
Johan S
11-xx-09
D
E1
VIN+
VIN
J1
VIN
R15
0 Ohm
CIN5
R8
VOUT
U1
LTC3775EUD
0 Ohm
R1
C4
*
*
C
R5
*
1
R6
10.0K
1%
R2
*
C2
R4
10.0K
1%
2
3
0.01uF
VIN
ILIMIT
BOOST
ILIMITB
100pF RUN
TG
MODE
15
R9
*
B
5
R16
(Opt)
SEE TABLE FOR
VIN RANGE
J2
GND
5
Q1
*
4
E3
VOUT+
VOUT
J3
L1
RUN
SENSE
MODE/SYNC
INTVCC
12
5
RS1
10
INTVCC
D2
9
FREQ
BG
SS
PGND
C6
0.01uF
8
17
C
Q3
(Opt)
1 2 3
0 Ohm
(Opt)
Q2
*
Q4
(Opt)
VOUT
1.2V
*
COUT4
100uF
6.3V
4
COUT1
+ 470uF
2.5V
+
COUT2
(Opt)
COUT5
+ 470uF
2.5V
COUT3
1uF
6.3V
X5R
SEE TABLE FOR
OUTPUT CURRENT
J4
1 2 3
CMDSH-4E
6
CIN1
100uF
50V
VIN-
COMP
SW
16
*
0.1uF
13
+
E2
R3 100pF
14
FB
*
C3
11
RSNS2
0.010
5%
CIN4
(Opt)
1210
CIN3
4.7uF
50V
1210
RS2
*C1
R7
4
0.1uF
50V
0805
C8
RSNS1
0.010
5%
CIN2
4.7uF
50V
1210
GND
C5
4.7uF
10V
0805
E4
VOUT-
B
SGND
7
INTVCC
E8
SGND
RUN
E6
E7
SYNC
VIN
RUN
CUSTOMER NOTICE
INTVCC
MODE
A
PULSE_SKIP
1
2
SYNC
3
FCC
R12
(Opt)
VOUT
1k
1
ON
R13
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
PCB DES. RB
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL ENG. Johan S
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
2
MODE
3
OFF
JP2
4
C7
(Opt)
CONTRACT NO.
R14
(Opt)
JP1
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
A
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
HIGH FREQUENCY SYNCHRONOUS STEP-DOWN CONVERTER
SIZE
NA
DATE:
IC NO.
REV
LTC3775EUD
DEMO CIRCUIT 1290A
Tuesday, December 08, 2009
2
SHEET 1
1
OF
1
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