Adjustable Positive
Voltage Regulator
LM317
Adustable Positive Voltage Regulator
General Description
•
The LM317 is an adjustable 3-terminal positive voltage
regulator, designed to supply 1A of output current with
. voltage adjustable from 1.3V ~ 37V.
•
The LM317 is available in SOT-223, D-PACK, TO-220
and D2-PACK packages.
SOT-223
D-PACK
(TO-252)
TO-220
D2-PACK
(TO-263)
Features
•
•
•
•
Output Voltage adjustable from 1.3V ~ 37V
Output current in excess of 1A
Internal short circuit protection
Internal over temperature protection
Applications
•
PC Motherboard
•
LCD Monitor
•
Graphic Card
•
•
•
•
DVD Player
Network Interface Card/Switch
Telecom Equipment
Printer and other Peripheral Equipment
•
Output transistors safe area compensation
•
RoHS Compliance
Ordering Information
TAITRON COMPONENTS INCORPORATED
www.taitroncomponents.com
Tel:
Fax:
(800)-TAITRON (800)-824-8766
(800)-TAITFAX (800)-824-8329
(661)-257-6060
(661)-257-6415
Rev. A/DX 2007-06-04
Page 1 of 8
Adjustable Positive Voltage Regulator
LM317
Pin Configuration
Outline: H
SOT-223
Outline: D
D-PACK (TO-252)
Outline: T
TO-220
Outline: MC
D2-PACK (TO-263)
Block Diagram
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 2 of 8
Adjustable Positive Voltage Regulator
LM317
Absolute Maximum Ratings
(Ta=25° C, unless otherwise specified)
Symbol
V
IN-
V
OUT
I
O
T
J
T
OPR
T
STG
P
D
Description
Input - Output Voltage Differential
Max. Output Current
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
Power Dissipation
Thermal Resistance
Junction-Case
T: TO-220
MC: D2-PACK (TO-263)
D: D-PACK (TO-252)
H: SOT-223
T: TO-220
MC: D2-PACK (TO-263)
D: D-PACK (TO-252)
H: SOT-223
Ratings
40
1.0
125
-40 ~ 85
-40 ~ 150
Internal limited
5
5
12
23
54
64
112
165
Unit
V
A
°C
°C
°C
mW
Rth
JC
° C/W
Rth
JA
Thermal Resistance
Junction-Ambient
° C/W
Note:
Absolute maximum ratings are stress ratings only and functional device operation is not
implied. The device could be damaged beyond Absolute maximum ratings.
Electrical Characteristics
(V
IN
-V
OUT
=5V, I
OUT
=10mA, T
A
=25ºC, unless otherwise specified)
Symbol
∆V
OUT/
V
OUT
∆V
OUT
I
ADJ
∆I
ADJ
V
REF
-
Description
Line Regulation
Load Regulation
Adjustable Pin Current
Adjustable Pin Current Change
Reference Input Voltage
Temperature Stability
LM317
Min.
Typ.
Max.
Unit
%/V
mV
mV
µA
µA
V
%/V
OUT
Conditions
3V≤V
IN
-V
OUT
≤40V
10mA≤I
OUT
≤1A,
V
OUT
≤
5V
10mA≤I
OUT
≤1A,
V
OUT
≥
5V
-
3V≤
V
IN
-V
OUT
≤40V,
-
-
-
-
-
1.20
-
0.01
5
0.1
50
0.2
1.25
0.7
0.04
25
0.5
100
5
1.30
-
10mA≤I
OUT
≤1A,
P
D
≤20W
3V≤
V
IN
-V
OUT
≤40V,
10mA≤I
OUT
≤1A,
P
D
≤20W
T
MIN
≤T
J
≤T
MAX
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 3 of 8
Adjustable Positive Voltage Regulator
LM317
Symbol
I
L(MIN
)
I
O(MAX
)
eN
RR
Description
Minimum Load Current for
Regulation
Maximum Output Current
RMS Noise vs. %of V
OUT
Ripple
Rejection
C
ADJ
=0
C
ADJ
=10µF
LM317
Min.
Typ.
Max.
Unit
mA
A
%/V
OUT
dB
Conditions
V
IN
-V
OUT
=40V
V
IN
-V
OUT
=40V, P
D
≤
20W
10Hz≤f≤10KHz
V
OUT
=10V, f=120Hz
-
0.3
-
-
66
3.5
0.4
0.003
65
80
10
-
-
-
-
Note:
C
ADJ
is connected between Adjust pin and Ground.
Typical Characteristics Curves
∆V
OUT
, Output Voltage Deviation
(
%
)
Fig.1- Load Regulation vs. Temperature
I
ADJ,
Adjustment Current
(
µA
)
Temperature (° C)
Fig.3-
Current Limit
I
OUT,
Min. Output Current
(
mA
)
I
OUT,
Output Current
(
mA
)
Fig.2- Adjustment Current vs. Temperature
Temperature (° C)
Fig.4- Minimum Operating Current
V
IN
-V
OUT
(V)
V
IN
-V
OUT
(V)
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 4 of 8
Adjustable Positive Voltage Regulator
LM317
Typical Application
Fig.5-Programmable Voltage Regulator
Fig.6- Regulator with On-off Control
Fig.7- Soft Start Application
Fig.8- Constant Current Application
Rev. A/DX 2007-06-04
www.taitroncomponents.com
Page 5 of 8
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