LM317, NCV317
1.5 A Adjustable Output,
Positive Voltage Regulator
The LM317 is an adjustable 3−terminal positive voltage regulator
capable of supplying in excess of 1.5 A over an output voltage range of
1.2 V to 37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it
employs internal current limiting, thermal shutdown and safe area
compensation, making it essentially blow−out proof.
The LM317 serves a wide variety of applications including local, on
card regulation. This device can also be used to make a programmable
output regulator, or by connecting a fixed resistor between the
adjustment and output, the LM317 can be used as a precision current
regulator.
Features
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1
2
3
D
2
PAK−3
D2T SUFFIX
CASE 936
•
•
•
•
•
•
•
•
Output Current in Excess of 1.5 A
Output Adjustable between 1.2 V and 37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting Constant with Temperature
Output Transistor Safe−Area Compensation
Floating Operation for High Voltage Applications
Eliminates Stocking many Fixed Voltages
Available in Surface Mount D
2
PAK−3, and Standard 3−Lead
Transistor Package
•
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
•
These are Pb−Free Devices
V
in
LM317
R
1
240
I
Adj
C
in
*
0.1
mF
R
2
Adjust
+ C **
O
1.0
mF
V
out
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
TO−220
T SUFFIX
CASE 221AB
1
2
3
Pin 1. Adjust
2. V
out
3. V
in
Heatsink surface connected to Pin 2.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
**
C
in
is required if regulator is located an appreciable distance from power supply filter.
** C
O
is not needed for stability, however, it does improve transient response.
R
V out
+
1.25 V 1
)
2
R1
)
I
R
Adj 2
Since I
Adj
is controlled to less than 100
mA,
the error associated with this term is
negligible in most applications.
Figure 1. Standard Application
©
Semiconductor Components Industries, LLC, 2016
1
May, 2018 − Rev. 15
Publication Order Number:
LM317/D
LM317, NCV317
MAXIMUM RATINGS
Rating
Input−Output Voltage Differential
Power Dissipation
Case 221A
T
A
= +25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 936 (D
2
PAK−3)
T
A
= +25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Operating Junction Temperature Range
Storage Temperature Range
Symbol
V
I
−V
O
Value
−0.3 to 40
Unit
Vdc
P
D
q
JA
q
JC
P
D
q
JA
q
JC
T
J
T
stg
Internally Limited
65
5.0
Internally Limited
70
5.0
−55 to +150
−65 to +150
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
ELECTRICAL CHARACTERISTICS
(V
I
−V
O
= 5.0 V; I
O
= 0.5 A for D2T and T packages; T
J
= T
low
to T
high
(Note 1); I
max
and P
max
(Note 2); unless otherwise noted.)
Characteristics
Line Regulation (Note 3), T
A
= +25°C, 3.0 V
≤
V
I
−V
O
≤
40 V
Load Regulation (Note 3), T
A
= +25°C, 10 mA
≤
I
O
≤
I
max
V
O
≤
5.0 V
V
O
≥
5.0 V
Thermal Regulation, T
A
= +25°C (Note 4), 20 ms Pulse
Adjustment Pin Current
Adjustment Pin Current Change, 2.5 V
≤
V
I
−V
O
≤
40 V,
10 mA
≤
I
L
≤
I
max
, P
D
≤
P
max
Reference Voltage, 3.0 V
≤
V
I
−V
O
≤
40 V, 10 mA
≤
I
O
≤
I
max
, P
D
≤
P
max
Line Regulation (Note 3), 3.0 V
≤
V
I
−V
O
≤
40 V
Load Regulation (Note 3), 10 mA
≤
I
O
≤
I
max
V
O
≤
5.0 V
V
O
≥
5.0 V
Temperature Stability (T
low
≤
T
J
≤
T
high
)
Minimum Load Current to Maintain Regulation (V
I
−V
O
= 40 V)
Maximum Output Current
V
I
−V
O
≤
15 V, P
D
≤
P
max,
T Package
V
I
−V
O
= 40 V, P
D
≤
P
max
, T
A
= +25°C, T Package
RMS Noise, % of V
O
, T
A
= +25°C, 10 Hz
≤
f
≤
10 kHz
Ripple Rejection, V
O
= 10 V, f = 120 Hz (Note 5)
Without C
Adj
C
Adj
= 10
mF
Thermal Shutdown (Note 6)
Long−Term Stability, T
J
= T
high
(Note 7), T
A
= +25°C for
Endpoint Measurements
Thermal Resistance Junction−to−Case, T Package
Figure
1
2
Symbol
Reg
line
Reg
load
−
−
−
3
1, 2
3
1
2
Reg
therm
I
Adj
DI
Adj
V
ref
Reg
line
Reg
load
−
−
3
3
3
T
S
I
Lmin
I
max
1.5
0.15
−
4
N
RR
−
66
−
3
−
−
S
R
qJC
−
−
−
65
80
180
0.3
5.0
−
−
−
1.0
−
°C
%/1.0
kHrs.
°C/W
−
2.2
0.4
0.003
−
−
−
% V
O
dB
−
−
20
0.3
0.7
3.5
70
1.5
−
10
mV
% V
O
% V
O
mA
A
−
−
−
1.2
−
5.0
0.1
0.03
50
0.2
1.25
0.02
25
0.5
0.07
100
5.0
1.3
0.07
mV
% V
O
% V
O
/W
mA
mA
V
%/V
Min
−
Typ
0.01
Max
0.04
Unit
%/V
1. T
low
to T
high
= 0° to +125°C, for LM317T, D2T. T
low
to T
high
= − 40° to +125°C, for LM317BT, BD2T, T
low
to T
high
= − 55° to +150°C, for
NCV317BT, BD2T.
2. I
max
= 1.5 A, P
max
= 20 W
3. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
4. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die.
These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these
temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
5. C
Adj
, when used, is connected between the adjustment pin and ground.
6. Thermal characteristics are not subject to production test.
7. Since Long−Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average
stability from lot to lot.
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LM317, NCV317
V
in
310
310
230
120
5.6 k
6.3 V
170
6.7 k
125 k
12.4 k
135
6.8 k
510
6.3 V
12 k
5.0 pF
200
160
13 k
30pF
6.3 V
190
3.6 k 5.8 k 110
5.1 k
30pF
2.4 k
105
4.0
12.5 k
0.1
V
out
Adjust
This device contains 29 active transistors.
Figure 2. Representative Schematic Diagram
V
CC
*
V
IH
V
IL
V
in
LM317
* Pulse testing required.
*
1% Duty Cycle
*
is suggested.
Adjust
C
in
0.1
mF
I
Adj
R
1
240
1%
Line Regulation (% V)
+
V
out
|V
–V |
OH OL
x 100
|V |
OL
V
OH
V
OL
+
C
O
1.0
mF
R
L
R
2
1%
Figure 3. Line Regulation and
DI
Adj
/Line Test Circuit
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LM317, NCV317
V
I
V
in
LM317
V
out
I
L
R
L
(max Load)
*
+
C
in
0.1
mF
I
Adj
C
O
1.0
mF
V
O
(min Load)
V
O
(max Load)
R
L
(min Load)
Adjust
R
1
240
1%
R
2
1%
* Pulse testing required.
*
1% Duty Cycle is suggested.
Load Regulation (mV) = V
O
(min Load) - V
O
(max Load)
Load Regulation (% V
O
) =
V
O
(min Load) - V
O
(max Load)
V
O
(min Load)
x 100
Figure 4. Load Regulation and
DI
Adj
/Load Test Circuit
V
in
V
out
LM317
I
L
Adjust
V
I
C
in
0.1
mF
I
SET
R
2
1%
R
1
I
Adj
240
1%
V
ref
+
C
O
1.0
mF
R
L
V
O
* Pulse testing required.
*
1% Duty Cycle is suggested.
To Calculate R
2
: V
out
= I
SET
R
2
+ 1.250 V
To Calculate R
2
:
Assume I
SET
= 5.25 mA
Figure 5. Standard Test Circuit
24 V
14 V
f = 120 Hz
V
in
LM317
V
out
Adjust
C
in
0.1
mF
R
1
240
1%
D
1
*
1N4002
+
C
O
1.0
mF
R
L
V
O
V
out
= 10 V
R
2
1.65 k
1%
+
C
Adj
10
mF
* D
1
Discharges C
Adj
if output is shorted to Ground.
Figure 6. Ripple Rejection Test Circuit
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LM317, NCV317
4.0
ΔV
out, OUTPUT VOLTAGE CHANGE (%)
0.4
I out , OUTPUT CURRENT (A)
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
-25
0
25
50
75
100
T
J
, JUNCTION TEMPERATURE (°C)
125
150
0
0
10
20
30
V
in
-V
out
, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
40
V
in
= 15 V
V
out
= 10 V
I
L
= 1.5 A
I
L
= 0.5 A
3.0
T
J
= 25°C
2.0
150°C
1.0
-55°C
Figure 7. Load Regulation
Figure 8. Current Limit
3.0
I Adj, ADJUSTMENT PIN CURRENT (
μ
A)
V in-Vout, INPUT-OUTPUT VOLTAGE
DIFFERENTIAL (Vdc)
70
65
60
55
50
45
40
35
-50
-25
0
25
50
75
100
125
150
DV
out
= 100 mV
2.5
I
L
= 1.5 A
1.0 A
2.0
500 mA
1.5
200 mA
20 mA
1.0
-50
-25
0
25
50
75
100
125
150
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 9. Adjustment Pin Current
Figure 10. Dropout Voltage
1.26
Vref, REFERENCE VOLTAGE (V)
ILmin , MINIMUM OPERATING CURRENT (mA)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
10
20
30
40
V
in
-V
out
, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
T
J
= -55°C
+25°C
+150°C
1.25
1.24
1.23
1.22
-50
-25
0
25
50
75 100 125
T
J
, JUNCTION TEMPERATURE (°C)
150
Figure 11. Temperature Stability
Figure 12. Minimum Operating Current
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