DC865A - Schematic

1
2
REVISION HISTORY
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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
Applications Engineering for assistance.
ECO
REV
DESCRIPTION
2
A
DATE
PROTO
APPROVED
04/01/05
A
U1
LT3021EDH
SHDN
3
E4
GND
ON
VIN
VOUT
4
1
NC
NC
11
2
NC
NC
5
NC
6
NC
9
SHDN
VOUT
500mA MAX
E2
13
R2
60.4K
1%
0402
R3
100K
1%
0402
R4
130K
1%
0402
R5
162K
1%
0402
R6
OPT
0402
NC
15
JP2
JP3
JP4
JP5
JP6
NC
16
ADJ
COUT
10uF
10V
+
C2
OPT
GND
E5
7
0.8V
1.2V
1.5V
1.8V
USER
SELECT
R1
20K
1%
0402
1
E3
JP1
2
OFF
14
SGND
10V
3
PGND
RSD
100K
1%
0402
VOUT
8
16V
CIN
10uF
VIN
PGND
C1 ** +
33uF
12
17
E1
10
*
VIN
1V - 10V
B
B
CONTRACT NO.
* 1V IS THE MINIMUM INPUT VOLTAGE THAT LT3021EDHC WILL OPERATE AT.
THE MINIMUM VOLTAGE FOR A SPECIFIC REGULATOR CIRCUIT DEPENDS
ON THE OUTPUT VOLTAGE (PLUS THE DROPOUT VOLTAGE).
** FOR DEMO BOARD PURPOSES ONLY
CAPACITOR C1 IS AN OPTIONAL PART. IT WAS INSERTED ON THE
DC865A TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO
THE USE OF LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB,
WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED.
APPROVALS
DRAWN
MEI
CHECKED
APPROVED
ENGINEER
DESIGNER
Wednesday, May 18, 2005
1
DATE
12/01/04
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
TITLE
SCH, LT3021EDH, LOW VOLTAGE LDO LINEAR REGULATOR
SIZE
CAGE CODE
SCALE:
FILENAME:
DWG NO
856A-2.DSN
2
REV
DC865A
SHEET
2
1
OF
1
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