Semiconductor Components Industries, LLC, 2004
August, 2004 - Rev. 12
1
Publication Order Number:
LM317M/D
LM317M
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
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
Pb-Free Packages are Available
Figure 1. Simplified Application
* = 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.
Since I
Adj
is controlled to less than 100
mA, the error associated with this
term is negligible in most applications.
LM317M
V
in
V
out
R
1
240
R
2
Adjust
I
Adj
*
C
in
0.1
mF
**
+ C
O
1.0
mF
V
in
V
out
Vout + 1.25 V 1 )
R2
R1
) IAdj R2
TO-220AB
T SUFFIX
CASE 221A
1
2
3
PIN ASSIGNMENT
1
2
3
V
in
Adjust
V
out
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
1
2
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
SOT-223
ST SUFFIX
CASE 318E
DPAK
DT SUFFIX
CASE 369C
Heatsink surface
connected to Pin 2
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1 2
3
4
See general marking information in the device marking
section on page 13 of this data sheet.
DEVICE MARKING INFORMATION
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LM317M
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2
MAXIMUM RATINGS
(T
A
= 25
C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input-Output Voltage Differential
V
I
-V
O
40
Vdc
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
P
D
q
JA
q
JC
P
D
q
JA
q
JC
P
D
q
JA
q
JC
Internally Limited
70
5.0
Internally Limited
92
5.0
Internally Limited
245
15
C/W
C/W
C/W
C/W
C/W
C/W
Operating Junction Temperature Range
T
J
- 40 to +125
C
Storage Temperature Range
T
stg
- 65 to +150
C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Figure 25 provides thermal resistance versus pc board pad size.
LM317M
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3
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
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 3) (T
A
= 25
C, 3.0 V
V
I
- V
O
40 V)
3
Reg
line
-
0.01
0.04
%/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
4
Reg
load
-
-
5.0
0.1
25
0.5
mV
% V
O
Adjustment Pin Current
5
I
Adj
-
50
100
m
A
Adjustment Pin Current Change
2.5 V
V
I
- V
O
40 V, 10 mA
I
L
0.5 A, P
D
P
max
3, 4
D
I
Adj
-
0.2
5.0
m
A
Reference Voltage
3.0 V
V
I
- V
O
40 V, 10 mA
I
L
0.5 A, P
D
P
max
5
V
ref
1.200
1.250
1.300
V
Line Regulation (Note 3)
3.0 V
V
I
-V
O
40 V
3
Reg
line
-
0.02
0.07
%/V
Load Regulation (Note 3)
10 mA
I
O
0.5 A
V
O
5.0 V
V
O
5.0 V
4
Reg
load
-
-
20
0.3
70
1.5
mV
% V
O
Temperature Stability (T
low
T
J
T
high
)
5
T
S
-
0.7
-
% V
O
Minimum Load Current to Maintain Regulation (V
I
- V
O
= 40 V)
5
I
Lmin
-
3.5
10
mA
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
5
I
max
0.5
0.15
0.9
0.25
-
-
A
RMS Noise, % of V
O
(T
A
= 25
C, 10 Hz
f
10 kHz)
-
N
-
0.003
-
% V
O
Ripple Rejection, V
O
= 10 V, f = 120 Hz (Note 4)
Without C
Adj
C
Adj
= 10
m
F
6
RR
-
66
65
80
-
-
dB
Long-Term Stability, T
J
= T
high
(Note 5)
T
A
= 25
C for End-point Measurements
5
S
-
0.3
1.0
%/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.
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. 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.
LM317M
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4
ELECTRICAL CHARACTERISTICS
(V
I
- V
O
= 5.0 V; I
O
= 0.1 A, T
J
= T
low
to T
high
(Note 6), unless otherwise noted.)
LM317MA / LM317MAB
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 7) (T
A
= 25
C, 3.0 V
V
I
- V
O
40 V)
3
Reg
line
-
0.01
0.04
%/V
Load Regulation (Note 7)
T
A
= 25
C, 10 mA
I
O
0.5 A
V
O
5.0 V
V
O
5.0 V
4
Reg
load
-
-
5.0
0.1
25
0.5
mV
% V
O
Adjustment Pin Current
5
I
Adj
-
50
100
m
A
Adjustment Pin Current Change
2.5 V
V
I
- V
O
40 V, 10 mA
I
L
0.5 A, P
D
P
max
3, 4
D
I
Adj
-
0.2
5.0
m
A
Reference Voltage
3.0 V
V
I
- V
O
40 V, 10 mA
I
L
0.5 A, P
D
P
max
5
V
ref
1.225
1.250
1.275
V
Line Regulation (Note 7)
3.0 V
V
I
-V
O
40 V
3
Reg
line
-
0.02
0.07
%/V
Load Regulation (Note 7)
10 mA
I
O
0.5 A
V
O
5.0 V
V
O
5.0 V
4
Reg
load
-
-
20
0.3
70
1.5
mV
% V
O
Temperature Stability (T
low
T
J
T
high
)
5
T
S
-
0.7
-
% V
O
Minimum Load Current to Maintain Regulation (V
I
- V
O
= 40 V)
5
I
Lmin
-
3.5
10
mA
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
5
I
max
0.5
0.15
0.9
0.25
-
-
A
RMS Noise, % of V
O
(T
A
= 25
C, 10 Hz
f
10 kHz)
-
N
-
-
-
% V
O
Ripple Rejection, V
O
= 10 V, f = 120 Hz (Note 8)
Without C
Adj
C
Adj
= 10
m
F
6
RR
-
66
65
80
-
-
dB
Long-Term Stability, T
J
= T
high
(Note 9)
T
A
= 25
C for End-point Measurements
5
S
-
0.3
1.0
%/1.0
kHrs.
6. T
low
to T
high
= 0
to +125
C for LM317MA
T
low
to T
high
= - 40
to +125
C for LM317MAB.
7. 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.
8. C
Adj
, when used, is connected between the adjustment pin and ground.
9. 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.
LM317M
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5
Figure 2. Representative Schematic Diagram
18k
6.8V
6.8V
350
300
300
300
3.0k
300
70
200k
1.25
60
50
130
8.67k
500
400
2.4k
12.8k
V
out
5.1k
6.3V
2.0k
6.0k
Adjust
V
in
180
180
10
pF
10
pF
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