DC1727A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
DESCRIPTION
1
PRODUCTION
APPROVED
DATE
JAINO P.
7-11-11
D
D
27
R2
8
21
RST1
RST2
CWDT
3
RST2
SS2
11
E9
E10
C7
C8
1500pF 1500pF
B
SYNC
VOUT1
E2
E3
VOUT1
5V @ 1A
GND
24
25
L2 1.0uH
6
C4
22uF
6.3V
1206
R3
100K
1
5
R5
100K
28
4
R7
49.9K
C5
1000pF
E5
VOUT2
1.8V @ 0.8A
E7
GND
E8
SYNC
C
C6
1000pF
GND
100K
WDE
GND
R8
WDE
R1
301K
18
R10
100K
17
9
16
100K
GND
ON
VOUT1R6
SS1
GND
1
OFF
JP1
2
FB2
WDO
15
10
GND
100K
23
R4
E15
FB1
26
E13
SW2
WDI
GND
E6
13
RST1
VIN2
RT
GND
PGOOD2
29
WDO
DA
E12
14
C3
22uF
6.3V
1206
D2
EN2
CPOR
WDI
U1
7
C
19
LT3641EFE
100K
2
PGOOD2
EN/UVLO
L1 4.7uH
SW1
1
R13
(OPT)
2
2
R11
100K
3
1
BST
(OPT)
E4 VOUT1
20
VIN
VOUT1
SW
E11
22
R12
301K
R14
EN2
C2
4.7uF
50V
1206
12
GND
D1
C1 0.22uF
10V
VIN
VIN
E1
7V -42V
TRANSIENT TO 55V
R9
32.4K
B
OPTIONAL COMPONENTS
L3
LPS4018-332ML
FB1
VEMI
GND
E14
VIN
OPT
C10
(OPT)
0603
+ C9
22uF
63V
OPT
C11
(OPT)
1210
E16
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN 0603.
ALL CAPACITORS ARE IN 0603.
A
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.
2. INSTALL SHUNTS AS SHOWN.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
HZ
JAINO P.
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
DUAL MONOLITHIC STEP-DOWN SWITCHING REGULATOR WITH
POWER-ON RESET AND WATCH DOG TIMER
SIZE
N/A
SCALE = NONE
2
DATE:
IC NO.
LT3641EFE
DEMO CIRCUIT 1727A
Friday, October 28, 2011
SHEET 1
1
REV.
1
OF 1
A
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