DC1504A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
DATE
APPROVED
-
4
PRODUCTION
04/07/10
JESUS R.
SENSE
E3
R27 0.1
R28 0.1
R29 0.1
R30 0.1
4527
4527
4527
4527
E6
VOUT
5V , 3A
C7
D
Vsns
E1
C14
4.7uF
0.020 1%
50V
10V
7343
25V
50CE22BS
OPTION
D
E5
GND
R7
68.1k
R6
10k
0
LOW
HIGH
1
23
18
INTVCC
DIV0
22
DIV2
VPP
ROSC
15
OSC
TP1
OSC
U2
LT4180EGN
R23
22.1k
47pF
R34
1k
0SC
19
14
3
C30
R26
1%
1%
D2
CMDSH-3
COSC
DRAIN
1%
13
R21
5.36K
OV
CHOLD4
2
INTVCC
SYNC
24
21
20
R9
30.1k
C
SPREAD
1%
11
1%
1
GUARD4
INTVCC
2
HIGH
10
10V
3
9
10V
R20
2.15k
JP5
LOW
1
CHOLD3
47uF
1
1uF
SPREAD
2
8
C16
47uF
SENSE
C15
R22
100k
3
17
HIGH
VC
D1
MBRA340T3G
GUARD2
SYNC
9
FB
CHOLD1
RT
11
L1 6.8uH
VIN
0.47uF
3
2
1
5
6
3
4
10
SW
1%
C10
PG
FB
R19
1.87k
2
GND
8
RUN/SD BOOST
12
7
C
1uF
RUN
5
50V
2
BD
C21
0.1uF
1
1
4
VIN
2
1%
Vsns
JP4
3
GUARD3
U1
LT3693EDD
DIV0
CHOLD2
100k
C22
COMP
JP1
3
DIV1
JP3
DIV1
R15
21.5k
RUN
DIV2
JP2
LOW
R14
OFF
10V
7343
+
C23
R18
100k
Vsns
LOW
Vsns
R17
100k
HIGH
Vsns
R16
100k
7
C13
22uF
50V
+
E2
ON
C31
470uF
INTVCC
16
8V - 36V
GND
+
470uF
R25
6
VIN
C8
+
470uF
C24
2.2nF
R24
1%
C28
C26
C25
C27
4.7nF
470pF
470pF 10nF
C29
330pF
33.2k 1%
DRAIN
B
OPTIONAL CIRCUIT
C32
5
OPT
OPT
SYNC
4
2Y
1A
2A
1
OSC
DRAIN 2
3
3
Q1
INTVCC
1
R32
R35
OPT
SN74LVC2G14DBVT OPT
NOTES: UNLESS OTHERWISE SPECIFIED,
C35
OPT
1. RESISTOR AND CAPCITOR CASE SIZE IS 1206.
2. INSTALL SHUNTS IN LOCATIONS INDICATE.
C36 OPT
TP2
CASCODE
R33
OPT
2N7002 OPT
OPTIONAL CIRCUIT
2
D3
1Y
C34
OPT
U3
GND VCC
6
B
COMP
INTVCC
OPT
COMP
CUSTOMER NOTICE
C33
OPT
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.
A
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
MI
JESUS R.
TITLE: SCHEMATIC
3A STEP-DOWN REGULATOR WITH VIRTUAL
REMOTE SENSE
SIZE
N/A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SCALE = NONE
2
IC NO.
LT4180EGN
REV.
DEMO CIRCUIT 1504A
DATE: Monday, July 26, 2010
SHEET 1
1
4
OF 1
A
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