DC1222A - Schematic

C
D
E
On
B
Off
A
JP1
Run
4
1
2
3
4
E2
R5
100k
R1
536k
1%
3
PG
RUN/SS
2
FB
VIN
R2
102k
1%
DA
10
R3
16.2k
1%
R4
40.2k
1%
4
VC
RT
AGND
13
C5
470pF
50V
2
C1
2.2uF
50V
+
E1
CIN
10uF
63V
E4
12
VIN
6.9V - 36V
Transient to 60V
GND
7
D1
MBRM140T3
SW
GND
1
VIN
C6
0.1uF
50V
9
exposed pad,
solder side
3
R6
200k
2
VOUT
R7
10
U1
LT3682EDD
8
BOOST
6
BD
5
SYNC
11
3
L1
10uH
VOUT
1
PGOOD
C4
0.22uF
16V
C2
10uF
10V
C3
0.47uF
10V
E3
1A, VIN > 12V
0.9A, VIN > 6.9V
E5
C7
220pF
50V
E6
JP2
Mode
Fixed Freq
Burst Mode
Sync
VOUT
5V
GND
SYNC
2
1
2
3
4
LOAD CAPABILITY
SYNC = 0V
SYNC > 0.8V
or CLOCKED
VIN > 12V
1A
0.8A
VIN > 6.9V
0.9A
0.7A
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Customer Notice
1
A
B
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.
C
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
PHONE (408) 954-8400 FAX (408) 434-0507
Title
1A
Size
A
Power Step-Down Switching Regulator
Document Number
Demo Circuit 1222A
Date: Monday, January 05, 2009
D
www.linear.com
Rev
A
LT3682EDD
Sheet
1
E
of
1
1
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