DC1439A - Schematic

REVISION HISTORY
REV
-
1
2
APPROVED
DESCRIPTION
PRODUCTION
C7, C8 & C9 CHANGE TO "NPO"
DATE
EDWIN L
11/15/10
EDWIN L
12/14/10
U1
LT3688EFE
VIN
VIN
7V - 36V
ECO
E1
6
E2
GND
C14
C3
4.7uF
50V
1206
VIN
BST1
3
R1
0 Ohm
1000pF
50V
R2
C4
0.22uF
24
EN/UVLO
SW1
17
WDI
DA1
VOUT2
WDE
ON
FB1
1
16
VOUT1
VOUT1
5V / 800mA
D1
DFLS140
5
R3
562K
1%
C15
22pF
1
R12
100K
3
OFF
R5
100K
15
WDO
RUN/SS1
JP1
14
E8
13
7
R6
100K
23
E9
R8
RST1
VOUT2
(1MHz)
49.9K C7
1%
R9
100K
E10
C8
1000pF
1000pF
C9
VIN
VIN
21
20
18
RST2
1000pF
CONFIG
1
22
E4
R4
107K
1%
C5
1000pF
RST1
BIAS
WDO
VOUT1
2
C1
22uF
10V
1206
GND
WDE
2
VOUT2
E3
NPIS43LS100MTRF
(OPT)
E7
WDI
L1
10uH
4
BST2
RST2
19
10
C6
0.22uF
CONFIG
SW2
DA2
FB2
CWDT
VOUT2
D2
DFLS140
8
R7
316K
1%
C16
22pF
12
RUN/SS2
GND
11
C2
22uF
10V
1206
VOUT2
3.3V / 800mA
E6
GND
R10
100k
1%
CPOR1
CPOR2
E5
NPIS43LS100MTRF
SYNC
RT
L2
10uH
9
C10
1000pF
25
2
3
GND
JP2
E11
SYNC
R11
100K
NOTE: UNLESS OTHERWISE SPECIFIED.
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
2. INSTALL SHUNTS AS SHOWN.
OPTIONAL CIRCUIT
E12
FB1
L3
CUSTOMER NOTICE
VIN
VEMI
C12
(OPT)
0603
3.3uH
C13
(OPT)
1210
+
C11
22uF
63V
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.
APPROVALS
PCB DES.
APP ENG.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
DUAL MONOLITHIC STEP-DOWN SWITCHING REGULATOR
WITH POWER-ON RESET AND WATCHDOG TIMER
SIZE
C:\PADS PROJECTS\1439A\SCH\1439A_00_REV2.DSN
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
TECHNOLOGY
RB
EDWIN L
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
DATE:
IC NO.
REV.
LT3688EFE
DEMO CIRCUIT 1439A
Tuesday, December 14, 2010
SHEET
2
1
OF
1
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