DC1781A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
DATE
2
PRODUCTION
5/11/11
VIN
E1
22uF,50V
SANYO
50CE22LX
D7
VOUT2
CMDSH-4E
PGOOD2
C24
1uF
10V
0603
E8
GND
C3
47uF
10V
1206
3
R4
12.4k
12
C14
OPT
R8
10k
R6 20k C5
D4
B340A
680pF
10
BOOST2
U1
LT3507AEFE
SW1
SW1
SW2
FB1
FB2
VC1
VC2
E10
TRK/SS1
TRK/SS2
E3
14
E4
15
E5
32
NIC., NPIM74C100MTRF
L3
10uH
VOUT3
VOUT3 E12
5V @ 1.8A
C26
1uF
10V
0603
E14
D9
VOUT3 CMDSH-4E
C10
47uF
10V
1206
GND
37
C9
0.22uF 38
0603
BOOST3
BIAS
SW3
TRK/SS4
DRIVE
24
R11 20k C11 680pF
R12
10.2k
D6
B240A
C19
47pF
23
FB3
FB4
VC3
VINSW
22
E16
TRK/SS3
UVLO
TRK/SS3
OVLO
26
28 C6
C15
VISHAY
TAIYO YUDEN
FB MJ3216HS800 IHLP-4040DZ-01
L4
FB1
22UH
BEAD
VIN
C21
0.01UF
0603
C22
2.2UF,50V
1210
+
E9
C
21
31
29
1
R23
10k
30
R13
1.07k
9
8
R14
49.9k
R15
100k
R17
18.2k
R18
3.32k
VOUT4
Q1
ZXTCM322
7
RT/SYNC
GND
VOUT2
3.3V @ 1.5A
E11
TRK/SS2
C29
OPT
E13
VOUT4
2.5V @ 0.3A
C27
1uF
10V E15
0603
GND
C28
OPT
C12
2.2uF
0603
R16
499
E17
B
TRK/SS4
C20
0.1uF
E19
SYNC
R19
107k
(450kHz)
VIN
C23
22UF,50V
SANYO
50CE22LX
CUSTOMER NOTICE
A
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN 0402.
ALL CAPACITORS ARE 0402.
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
C25
1uF
10V
0603
C16
OPT
25
R20
OPT
OPTIONAL CIRCUIT
PGOOD3
GND
R9
10k
16
GND
39
27
RUN3
NC
R22
100k
E18
SD
RUN2
20
18
19
B
47pF
PGOOD2
VOUT2
C4
22uF,6.3V
1206
680pF R7 20k
D5
B240A
PGOOD1
E7
R5
31.6k
RUN1
NC
17
34
C13
0.1uF
VIN
D8
CMDSH-4E
NIC., NPIM74C8R2MTRF
L2
8.2uH
C7
0.1uF
R10
53.6k
C18
OPT
C2
0.22uF
25V
0603
33
TRK/SS1
C8
0.1uF
R3
100k
13
C17 47pF
11
C
PGOOD3
R2
100k
3
E6
2
BOOST1
R1
100k
2
VOUT1
1.8V @ 2.7A
C1
0.47uF
0603
NIC., NPIM74C4R7MTRF
L1
4.7uH
VOUT1
1
PGOOD1
4
D
D3
CMDSH-4E
OPT
VIN3
VIN2
D2
CMDSH-4E
OPT
VIN1
D1
CMDSH-4E
OPT
36
VOUT2
D
35
GND
EDWIN L.
R21
OPT
0603
+ CIN4
VIN2
CIN3
2.2uF
50V
1210
6
E2
CIN2
2.2uF
50V
1210
VIN1
CIN1
2.2uF
50V
1210
5
VIN
7V - 36V
APPROVED
4
3
APPROVALS
PCB DES.
HZ
APP ENG.
EDWIN L.
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
TRIPLE MONOLITHIC STEP-DOWN REGULATOR WITH LDO
SIZE
N/A
SCALE = NONE
2
IC NO.
LT3507AEFE
REV.
2
DEMO CIRCUIT 1781A
DATE: Monday, August 01, 2011
SHEET 1
1
OF 1
A
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