LD1117A
Low drop fixed and adjustable positive voltage regulators
Datasheet
-
production data
•
Available in ± 2% (at 25 °C) and 4% in full
temperature range
•
High supply voltage rejection:
– 80 dB typ. (at 25 °C)
SOT-223
TO-220
•
Temperature range: 0 °C to 125 °C
Description
The LD1117A is a low drop voltage regulator able
to provide up to 1 A of output current, available
also in adjustable versions (V
REF
= 1.25 V). In
fixed versions, the following output voltages are
offered: 1.2 V, 1.8 V, and 3.3 V. The device is
supplied in: SOT-223, DPAK and TO-220. Surface
mounted packages optimize the thermal
characteristics while offering a relevant space
saving advantage. High efficiency is assured by
an NPN pass transistor. Only a very common 10
µF minimum capacitor is needed for stability. Chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within ± 2% at 25 °C.
DPAK
Features
•
Low dropout voltage:
– 1.15 V typ. @ I
OUT
= 1 A, 25 °C
•
Very low quiescent current:
– 5 mA typ. @ 25 °C
•
Output current up to 1 A
•
Fixed output voltage of:
– 1.2 V, 1.8 V, 3.3 V
•
Adjustable version availability (V
REF
= 1.25 V)
•
Internal current and thermal limit
•
Only 10 µF for stability
Table 1. Device summary
Order codes
Output voltage
SOT-223
LD1117AS12TR
LD1117AS18TR
LD1117AS33TR
LD1117ASTR
DPAK
LD1117ADT12TR
LD1117ADT18TR
LD1117ADT33TR
LD1117ADT-TR
LD1117AV33
TO-220
1.2 V
1.8 V
3.3 V
Adjustable from 1.25 V
July 2013
This is information on a product in full production.
DocID7194 Rev 26
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Contents
LD1117A
Contents
1
2
3
4
5
6
7
8
9
10
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LD1117A adjustable: application note . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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LD1117A
Maximum ratings
3
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
V
IN
P
D
T
STG
T
OP
DC input voltage
Power dissipation
Storage temperature range
Operating junction temperature range
Parameter
Value
15
12
-40 to +150
0 to +125
Unit
V
W
°C
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied. Beyond the above suggested
max. power dissipation, a short-circuit may permanently damage the device.
Table 3. Thermal data
Symbol
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
SOT-223
15
110
DPAK
8
100
TO-220
5
50
Unit
°C/W
°C/W
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Power technology
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