LM317M, NCV317MAB,
NCV317MB
500 mA Adjustable Output,
Positive Voltage Regulator
The LM317M is an adjustable three−terminal positive voltage
regulator capable of supplying in excess of 500 mA 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 LM317M serves a wide variety of applications including local,
on−card regulation. This device also makes an especially simple
adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the
LM317M can be used as a precision current regulator.
Features
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Heatsink surface
connected to Pin 2
TO−220AB
T SUFFIX
CASE 221AB
1
2
3
•
•
•
•
•
•
•
•
Output Current in Excess of 500 mA
Output Adjustable between 1.2 V and 37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe−Area Compensation
Floating Operation for High Voltage Applications
Eliminates Stocking Many Fixed Voltages
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
•
Pb−Free Packages are Available
V
in
LM317M
R
1
240
*
C
in
0.1mF
R
2
I
Adj
Adjust
**
+C
O
1.0mF
V
out
SOT−223
ST SUFFIX
CASE 318E
1
2
3
4
DPAK
DT SUFFIX
CASE 369C
1 2
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
V
in
V
out
PIN ASSIGNMENT
1
2
3
Adjust
V
out
V
in
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions 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
Vout
+
1.25 V 1
)
2
)
IAdj R2
R1
Since I
Adj
is controlled to less than 100
mA,
the error associated with this
term is negligible in most applications.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
Figure 1. Simplified Application
1
Publication Order Number:
LM317M/D
©
Semiconductor Components Industries, LLC, 2011
September, 2011
−
Rev. 21
LM317M, NCV317MAB, NCV317MB
MAXIMUM RATINGS
(T
A
= 25°C, unless otherwise noted.)
Rating
Input−Output Voltage Differential
Power Dissipation (Package Limitation) (Note 1)
Plastic Package, T Suffix, Case 221A
T
A
= 25°C
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Plastic Package, DT Suffix, Case 369C
T
A
= 25°C
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Plastic Package, ST Suffix, Case 318E
T
A
= 25°C
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Operating Junction Temperature Range
Storage Temperature Range
Symbol
V
I
−V
O
Value
40
Unit
Vdc
P
D
q
JA
q
JC
P
D
q
JA
q
JC
P
D
q
JA
q
JC
T
J
T
stg
Internally Limited
70
5.0
Internally Limited
92
5.0
Internally Limited
245
15
−40
to +150
−65
to +150
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Figure 25 provides thermal resistance versus PC board pad size.
ELECTRICAL CHARACTERISTICS
(V
I
−
V
O
= 5.0 V; I
O
= 0.1 A, T
J
= T
low
to T
high
(Note 2), unless otherwise noted.)
LM317M / LM317MB/NCV317MB
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
≤
0.5 A
V
O
≤
5.0 V
V
O
≥
5.0 V
Adjustment Pin Current
Adjustment Pin Current Change
2.5 V
≤
V
I
−
V
O
≤
40 V, 10 mA
≤
I
L
≤
0.5 A, P
D
≤
P
max
Reference Voltage
3.0 V
≤
V
I
−
V
O
≤
40 V, 10 mA
≤
I
L
≤
0.5 A, P
D
≤
P
max
Line Regulation 3.0 V
≤
V
I
−V
O
≤
40 V (Note 3)
Load Regulation 10 mA
≤
I
O
≤
0.5 A (Note 3)
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
V
I
−
V
O
= 40 V, P
D
≤
P
max
, T
A
= 25°C
RMS Noise, % of V
O
(T
A
= 25°C, 10 Hz
≤
f
≤
10 kHz)
Ripple Rejection, V
O
= 10 V, f = 120 Hz (Note 4)
Without C
Adj
C
Adj
= 10
mF
Thermal Shutdown (Note 5)
Long−Term Stability, T
J
= T
high
(Note 6)
T
A
= 25°C for End−point Measurements
Figure
3
4
Symbol
Reg
line
Reg
load
−
−
5
3, 4
5
3
4
I
Adj
DI
Adj
V
ref
Reg
line
Reg
load
−
−
1.20
−
−
−
−
−
0.5
0.15
−
−
66
−
−
5.0
0.1
50
0.2
1.25
0.02
20
0.3
0.7
3.5
0.9
0.25
0.003
65
80
180
0.3
25
0.5
100
5.0
1.30
0.07
70
1.5
−
10
−
−
−
−
−
−
1.0
mV
% V
O
mA
mA
V
%/V
mV
% V
O
% V
O
mA
A
Min
−
Typ
0.01
Max
0.04
Unit
%/V
5
5
5
T
S
I
Lmin
I
max
−
6
N
RR
% V
O
dB
−
5
−
S
°C
%/1.0
kHrs.
2. T
low
to T
high
= 0° to +125°C for LM317M
T
low
to T
high
=
−
40° to +125°C for LM317MB, NCV317MB.
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. C
Adj
, when used, is connected between the adjustment pin and ground.
5. Thermal characteristics are not subject to production test.
6. 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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2
LM317M, NCV317MAB, NCV317MB
ELECTRICAL CHARACTERISTICS
(V
I
−
V
O
= 5.0 V; I
O
= 0.1 A, T
J
= T
low
to T
high
(Note 7), unless otherwise noted.)
Characteristics
Line Regulation (Note 8) (T
A
= 25°C, 3.0 V
≤
V
I
−
V
O
≤
40 V)
Load Regulation (Note 8)
T
A
= 25°C, 10 mA
≤
I
O
≤
0.5 A
V
O
≤
5.0 V
V
O
≥
5.0 V
Adjustment Pin Current
Adjustment Pin Current Change
2.5 V
≤
V
I
−
V
O
≤
40 V, 10 mA
≤
I
L
≤
0.5 A, P
D
≤
P
max
Reference Voltage
3.0 V
≤
V
I
−
V
O
≤
40 V, 10 mA
≤
I
L
≤
0.5 A, P
D
≤
P
max
Line Regulation (Note 8)
3.0 V
≤
V
I
−V
O
≤
40 V
Load Regulation (Note 8)
10 mA
≤
I
O
≤
0.5 A
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
V
I
−
V
O
= 40 V, P
D
≤
P
max
, T
A
= 25°C
RMS Noise, % of V
O
(T
A
= 25°C, 10 Hz
≤
f
≤
10 kHz)
Ripple Rejection, V
O
= 10 V, f = 120 Hz (Note 9)
Without C
Adj
C
Adj
= 10
mF
Thermal Shutdown (Note 10)
Long−Term Stability, T
J
= T
high
(Note 11)
T
A
= 25°C for End−point Measurements
Figure
3
4
Symbol
Reg
line
Reg
load
−
−
5
3, 4
5
3
4
I
Adj
DI
Adj
V
ref
Reg
line
Reg
load
−
−
5
5
5
T
S
I
Lmin
I
max
−
−
0.5
0.15
−
−
66
−
−
20
0.3
0.7
3.5
0.9
0.25
−
65
80
180
0.3
70
1.5
−
10
−
−
−
−
−
−
1.0
mV
% V
O
% V
O
mA
A
−
−
1.225
−
5.0
0.1
50
0.2
1.250
0.02
25
0.5
100
5.0
1.275
0.07
mV
% V
O
mA
mA
V
%/V
LM317MA / LM317MAB/NCV317MAB
Min
Typ
Max
−
0.01
0.04
Unit
%/V
−
6
N
RR
% V
O
dB
−
5
−
S
°C
%/1.0
kHrs.
7. T
low
to T
high
= 0° to +125°C for LM317MA
T
low
to T
high
=
−
40° to +125°C for LM317MAB, NCV317MAB.
8. 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.
9. C
Adj
, when used, is connected between the adjustment pin and ground.
10. Thermal characteristics are not subject to production test.
11. 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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3
LM317M, NCV317MAB, NCV317MB
V
in
300
300
300
3.0k
300
70
6.8V
6.8V
350
18k
8.67k
130
5.1k
200k
500
400
6.3V
180
180
2.0k
6.0k
10
pF 10
pF
60
1.25
V
out
2.4k
12.8k
50
Adjust
Figure 2. Representative Schematic Diagram
V
CC
Line Regulation (%/V) =
*
V
IH
V
IL
V
in
LM317M
V
out
V
OH
- V
OL
V
OL
x 100
V
OH
V
OL
Adjust
C
in
0.1mF
I
Adj
R
1
240
1%
C
O
R
L
+
1.0mF
* Pulse Testing Required:
1% Duty Cycle is suggested.
R2
1%
Figure 3. Line Regulation and
DI
Adj
/Line Test Circuit
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4
LM317M, NCV317MAB, NCV317MB
Load Regulation (mV) = V
O
(min Load) -V
O
(max Load)
V
O
(min Load) - V
O
(max Load)
Load Regulation (% V
O
) =
V
O
(min Load)
V
in
V
in
LM317M
V
out
I
L
R
L
(max Load)
*
+
C
in
0.1mF
I
Adj
C
O
1.0mF
X 100
V
O
(min Load)
VO (max Load)
Adjust
R
1
240
1%
R
L
(min Load)
R
2
1%
* Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 4. Load Regulation and
DI
Adj
/Load
Test Circuit
V
in
LM317M
V
out
I
L
Adjust
V
I
C
in
0.1mF
I
SET
R
2
1%
R
1
I
Adj
240
1%
V
ref
+
C
O
1mF
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
Assume I
SET
= 5.25 mA
Figure 5. Standard Test Circuit
24V
14V
f = 120 Hz
V
in
LM317M
V
out
V
out
= 10 V
Adjust
C
in
0.1mF
R
1
240
1%
D
1
*
1N4002
+
C
O
1.0mF
R
L
V
O
R
2
1.65K
1%
**
C
Adj
+
10mF
* D
1
Discharges C
Adj
if Output is Shorted to Ground.
**C
Adj
provides an AC ground to the adjust pin.
Figure 6. Ripple Rejection Test Circuit
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