DC1537A - Schematic

5
4
3
2
1
REVISION HISTORY
INPUT MODE
1
ECO
REV
SINGLE
DESCRIPTION
2
PRODUCTION
DATE
APPROVED
01-17-12
EDWIN L.
2
VOUT1
CASCADE
3
4
VIN1
D
DUAL
JP1
[1]
VIN2
D
VIN1
TP1
C22
2.2uF VIN1
100V
1210
0603
35
TP3
6
D7
OPT
38
D1
C4 0.47uF
0603
MMSD701T1G
D2
B360B
2
TP5
GND
C6
10uF
16V
OPT
0805
4
C7
100uF
10V
1210
9
R5
42.2K
1%
R7
100K
C10
8
22pF
7
34
TP7
33
R9 8.06K 1%
CMPO1
SS1
32
TP9
30
TP11
R11 100K 1%
C12
27
C14 680pF R13 30k 1%
0.1uF
1
3
C16 33pF
5
10
B
SYNC
15
TP13
C25
10nF
OPT
R15
7.32k
1%
R16
20k
1%
BST1
BST2
SW1
SW2
IND1
IND2
VOUT1
VOUT2
FB1
FB2
CMPI1
CMPI2
CMPO1
CMPO2
SS1
SS2
ILIM1
ILIM2
VC1
VC2
RT/SYNC
CLKOUT
DIV
TJ
NC
NC
NC
NC
NC
NC
NC
NC
NC
7V - 60V
TP17
0603
TP4
SHDN2
D8
OPT
20
C5 0.47uF
0603
D4
D5
MMSD701T1G
B360B
C
18
VOUT2
16
C8
100uF
10V
1210
11
C11
22pF
12
13
R6
24.9K
1%
R8
100K
C9
10uF
16V
OPT
0805
TP6
24
TP8
25
VOUT2
3.3V / 2A
*
GND
R10 8.06K 1%
26
TP10
29
R12 100K 1%
28
R14 30k 1% C15 680pF
37
31
TP12
C13
CMPO2
SS2
0.1uF
C17 33pF
21
19
R18
17
TP14
OPT
TP15
CLKOUT
B
TEMP
R17
40.2k
1%
L3 22uH
OPT
OPT
C20
2.2uF
100V
OPT
1210
+
C18
22uF
100V
OPT
OPTIONAL CIRCUIT
CUSTOMER NOTICE
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
NOTES: UNLESS OTHERWISE SPECIFIED,
[1] SEE QUICK START GUIDE FOR DETAILS ON JP1 SETTING
AND INPUT VOLTAGE IMPLEMENTATION ORDER.
2. ALL CAPACITORS ARE 0402.
ALL RESISTORS ARE 0402.
SEE QUICK START GUIDE FOR DETAILS ON
CURRENT CAPABILITY.
APPROVALS
PCB DES.
APP ENG.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
TECHNOLOGY
JW
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
EDWIN L. TITLE: SCHEMATIC
SIZE
*
5
VIN2
VIN1
FB1 BEAD
C19
0.01uF
100V
OPT
0603
NC
R2
1k
1%
14
C24
10nF
(300kHz)
VIN1
C3
2.2uF
100V
1210
TP16
C21
22uF
100V
23
L2
10uH
VOUT1
*
SHDN2
L1
22uH
C
VOUT1
5V / 2A
SHDN1
D3
MMSD701T1G
OPT
22
LT3992EFE
SHDN1
C23
2.2uF
100V
1210
VIN2
+
GND
U1
D6
MMSD701T1G
OPT
VIN2
R1
1k
1%
TP2
VOUT1
PGND
GND
VOUT2
39
C2
2.2uF
100V
1210
22uF
100V
36
7V - 60V
VIN1
+ C1
N/A
SCALE = NONE
2
DUAL MONOLITHIC STEP-DOWN
CONVERTER
IC NO.
LT3992EFE
DEMO CIRCUIT 1537A
DATE: Tuesday, January 31, 2012
SHEET 1
1
REV.
2
OF 1
A
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