2000 Fairchild Semiconductor International
Rev. B, May 2000
LM317T (KA317)
LM317T (KA317)
Adjustable Voltage
Regulator (Positive)
3-TERMINAL POSITIVE ADJUSTABLE
REGULATOR
This monolithic integrated circuit is an adjustable 3-terminal
positive voltage regulator designed to supply 2.2A typical
of load current with an output voltage adjustable over a 1.2
to 37V. It employs internal current limiting, thermal shut-
down and safe area compensation.
FEATURES
Output Current 2.2A Typical
Output Adjustable Between 1. 2V and 37V
Internal Thermal-Overload Protection
Internal Short-Circuit Current-Limiting
Output Transistor Sate-Area Compensation
TO-220 Package
ORDERING INFORMATION
Device
Package
Operating Temperature
LM317T (KA317)
TO-220
0C ~ +125C
BLOCK DIAGRAM
Vin
3
1
Vadj
2
Vo
Rlimit
Voltage
Reference
Production
Circuitry
+
-
TO-220
2000 Fairchild Semiconductor International
Rev. B, May 2000
LM317T (KA317)
ABSOLUTE MAXIMUM RATINGS
(T
A
= +25C, unless otherwise specified)
ELECTRICAL CHARACTERISTICS
(V
I
- V
O
= 5V, I
O
= 0.5A, 0C
T
J
+125C, I
MAX
= 1.5A, P
MAX
= 20W, unless otherwise specified)
*
Load and line regulation are specified at constant junction temperature. Change in V
D
due to heating effects must be taken into account separately. Pulse testing
with low duty is used. (P
MAX
= 20W)
Characteristic
Symbol
Value
Unit
Input-Output Voltage Differential
V
I
- V
O
40
V
Lead Temperature
T
LEAD
230
C
Power Dissipation
P
D
Internally limited
W
Operating Temperature Range
T
OPR
0 ~ +125
C
Storage Temperature Range
T
STG
-65 ~ +125
C
Temperature Coefficient of Output Voltage
V
O
/T
0.02
%/C
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
Line Regulation
Rline
T
A
= +25C
3V
V
I
- V
O
40V
0.01
0.04
%/V
3V
V
I
- V
O
40V
0.02
0.07
%/V
Load Regulation
Rload
T
A
= +25C, 10mA
I
O
I
MAX
V
O
< 5V
V
O
5V
18
0.4
25
0.5
mV
%/V
O
10mA
I
O
I
MAX
V
O
< 5V
V
O
5V
40
0.8
70
1.5
mV
%/V
O
Adjustable Pin Current
I
ADJ
46
100
A
Adjustable Pin Current Change
I
ADJ
3V
V
I
- V
O
40V
10mA
I
O
I
MAX
P
P
MAX
2.0
5
A
Reference Voltage
V
REF
3V
V
IN
- V
OUT
40V
10mA
I
O
I
MAX
P
D
P
MAX
1.20
1.25
1.30
V
Temperature Stability
ST
t
0.7
%/V
O
Minimum Load Current to
Maintain Regulation
L
(MIN)
V
I
- V
O
= 40V
3.5
12
mA
Maximum Output Current
I
O(MAX)
V
I
- V
O
15V, P
D
P
MAX
V
I
- V
O
40V, P
D
P
MAX
, T
A
= 25C
1.0
2.2
0.3
A
RMS Noise, % of V
OUT
e
N
T
A
= +25C, 10Hz
f
10KHz
0.003
0.01
%/V
O
Ripple Rejection
RR
V
O
= 10V, f = 120Hz
without C
ADJ
C
ADJ
= 10F
66
60
75
dB
Long-Term Stability, T
J
= T
HIGH
ST
T
A
= +25C for end point
measurements, 1000HR
0.3
1
%
Thermal Resistance Junction to
Case
R
JC
5
C/W
2000 Fairchild Semiconductor International
Rev. B, May 2000
LM317T (KA317)
TYPICAL PERFORMANCE CHARACTERISTICS
Fig. 1 Load Regulation
Fig. 3 Dropout Voltage
Fig. 2 Adjustment Current
OUTPUT VOL
T
AGE DEVIA
TION (%)
Adjustment Current (
A)
TEMPERATURE (
C)
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0
25
50
125
100
75
Fig. 4 Reference Voltage
I
L
= 0.5A
I
L
= 1.5A
35
40
45
50
55
-50
-25
0
125
100
25
50
75
INPU-OUTPUT VOL
T
AGE DIFFERENTIAL (V)
REFERENCE VOL
T
AGE (V)
TEMPERATURE (
C)
TEMPERATURE (
C)
TEMPERATURE (
C)
1
1.5
2
2.5
3
0
25
50
125
100
75
I
L
= 1.5A
V
o
= 100mV
I
L
= 1A
I
L
= 20mA
I
L
= 200mA
I
L
= 500mA
1.235
1.245
1.24
1.25
1.255
1.26
-50
-25
0
125
100
25
50
75
2000 Fairchild Semiconductor International
Rev. B, May 2000
LM317T (KA317)
Typical Application
Fig. 5 Programmable Regulator
C
i
is required when regulator is located at an appreciable distance from the power supply filter.
C
o
improves transient response by reducing AC noise which is present at the output.
Since I ADJ is controlled to less than 100A, the error associated with this term is negligible in most applications.
V
I
Vo = 1.25V (1 + R
2
/R
1
) + I
adj
R
2
KA317
VI
Vo
R
1
I
adj
adj
0.1
F
R
2
C
o
0.1
F
C
i
Vadj
2000 Fairchild Semiconductor International
Rev. B, May 2000
LM317T (KA317)
Dimensions in Millimeters
August 1999, Rev B
TO-220 Package Dimensions
4.50
0.20
9.90
0.20
1.52
0.10
0.80
0.10
2.40
0.20
10.00
0.20
1.27
0.10
3.60
0.10
(8.70)
2.80
0.10
15.90
0.20
10.08
0.30
18.95MAX.
(1.70)
(3.70)
(3.00)
(1.46)
(1.00)
(45
)
9.20
0.20
13.08
0.20
1.30
0.10
1.30
+0.10
0.05
0.50
+0.10
0.05
2.54TYP
[2.54
0.20
]
2.54TYP
[2.54
0.20
]
TO-220 (FS PKG CODE AE)
2000 Fairchild Semiconductor International
Rev. E
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
ACExTM
BottomlessTM
CoolFETTM
CROSSVOLTTM
E
2
CMOSTM
FACTTM
FACT Quiet SeriesTM
FAST
FASTrTM
GTOTM
HiSeCTM
ISOPLANARTM
MICROWIRETM
POPTM
PowerTrench
QFETTM
QSTM
Quiet SeriesTM
SuperSOTTM-3
SuperSOTTM-6
SuperSOTTM-8
SyncFETTM
TinyLogicTM
UHCTM
VCXTM
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR
CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, or (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or In
Design
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
PDF 
ZIP