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ON Semiconductor
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.
• 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
• Available in Surface Mount D
Package
• Eliminates Stocking many Fixed Voltages
2
PAK, and Standard 3–Lead Transistor
LM317
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
Pin 1. Adjust
2. V
3. V
1
2
3
out
in
Standard Application
V
in
Cin*
0.1 µF
**Cin is required if regulator is located an appreciable distance from power supply filter.
**C
is not needed for stability, however, it does improve transient response.
O
V
1.25V
out
is controlled to less than 100 µA, the error associated with this term is
Since I
Adj
negligible in most applications.
I
Adj
LM317
1
Adjust
R
2
R
R
2
1
I
Adj
V
out
R
1
240
+
CO**
1.0 µF
R
2
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
ORDERING INFORMATION
Device
LM317BD2T
LM317BT
LM317D2T
LM317T
2
PAK)
Operating
Temperature Range
= –40° to +125°C
T
J
T
= 0° to +125°C
J
2
1
3
Package
Surface Mount
Insertion Mount
Surface Mount
Insertion Mount
Semiconductor Components Industries, LLC, 2002
January , 2002 – Rev. 3
1 Publication Order Number:
LM317/D
LM317
MAXIMUM RATINGS
Rating Symbol Value Unit
Input–Output V oltage Differential VI–V
Power Dissipation
Case 221A
TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ
Case 936 (D2PAK)
TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ
Operating Junction Temperature Range T
Storage Temperature Range T
stg
JA
JC
JA
JC
O
D
40 Vdc
Internally Limited W
65 °C/W
5.0 °C/W
D
Internally Limited W
70 °C/W
5.0 °C/W
J
–40 to +125 °C
–65 to +150 °C
ELECTRICAL CHARACTERISTICS (V
I–VO
= 5.0 V; I
= 0.5 A for D2T and T packages; TJ = T
O
low
to T
high
[Note 1]; I
max
and P
[Note 2]; unless otherwise noted.)
Characteristics
Line Regulation (Note 3), TA = +25°C, 3.0 V ≤ VI–VO ≤ 40 V 1 Reg
Load Regulation (Note 3), TA = +25°C, 10 mA ≤ IO ≤ I
max
VO ≤ 5.0 V
V
≥ 5.0 V
O
Thermal Regulation, TA = +25°C (Note 6), 20 ms Pulse Reg
Adjustment Pin Current 3 I
Adjustment Pin Current Change, 2.5 V ≤ VI–VO ≤ 40 V,
10 mA ≤ I
≤ I
, PD ≤ P
L
max
max
Reference Voltage, 3.0 V ≤VI–VO ≤ 40 V,
10 mA ≤ I
≤ I
, PD ≤ P
O
max
max
Line Regulation (Note 3), 3.0 V ≤ VI–VO ≤ 40 V 1 Reg
Load Regulation (Note 3), 10 mA ≤ IO ≤ I
max
VO ≤ 5.0 V
V
≥ 5.0 V
O
Temperature Stability (T
≤ TJ ≤ T
low
) 3 T
high
Minimum Load Current to Maintain Regulation (VI–VO = 40 V) 3 I
Maximum Output Current
V
≤ 15 V, PD ≤ P
I–VO
= 40 V, PD ≤ P
V
I–VO
T Package
max,
, TA = +25°C, T Package
max
Figure Symbol Min Typ Max Unit
– 0.01 0.04 %/V
–
–
5.0
0.1
25
0.5
– 0.03 0.07 % VO/W
– 50 100 µA
– 0.2 5.0 µA
1.2 1.25 1.3 V
– 0.02 0.07 % V
–
–
20
0.3
70
1.5
– 0.7 – % V
– 3.5 10 mA
1.5
0.15
2.2
0.4
–
–
2 Reg
1, 2 ∆I
3 V
2 Reg
3 I
line
load
therm
Adj
Adj
ref
line
load
S
Lmin
max
RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz N – 0.003 – % V
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4)
Without C
C
Long–Term Stability, TJ = T
= 10 µF
Adj
Adj
(Note 5), TA = +25°C for
high
4 RR
–
66
65
80
–
–
3 S – 0.3 1.0 %/1.0 k
Endpoint Measurements
Thermal Resistance Junction to Case, T Package R
NOTES: 1.T
to T
low
2.I
max
3.Load and line regulation are specified at constant junction temperature. Changes in V
Pulse testing with low duty cycle is used.
4.C
Adj
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.
6.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.
= 0° to +125°C, for LM317T, D2T. T
high
= 1.5 A, P
, when used, is connected between the adjustment pin and ground.
max
= 20 W
low
to T
= –40° to +125°C, for LM317BT, BD2T.
high
θ
JC
due to heating effects must be taken into account separately.
O
– 5.0 – °C/W
mV
% V
mV
% V
dB
Hrs.
max
O
O
O
A
O
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2
125k
j
LM317
Representative Schematic Diagram
V
31
310 230 120
5.6k
0
170
6.7k
12k
160
5.0pF
200
135
12.4k
6.8k
510
in
6.3V
13k
6.3V
6.3V
190
*
*Pulse testing required.
*1% Duty Cycle
*is suggested.
3.6k 5.8k 110 5.1k
V
CC
V
V
C
0.1 µF
in
30
pF
30
pF
2.4k
12.5k
This device contains 29 active transistors.
IH
IL
V
in
LM317
LineRegulation(%V)
V
out
Adjust
R
I
Adj
105
4.0
0.1
V
out
Adjust
|VOHVOL|
|VOL|
240
1
1%
O
x100
+
1.0 µFC
V
OH
V
OL
R
L
R
2
1%
Figure 1. Line Regulation and ∆I
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/Line Test Circuit
Ad
LM317
V
I
C
in
V
0.1 µF
in
Load Regulation (mV) = V
V
I
C
in
LM317
I
Adj
Adjust
R
2
out
R
I
240
1
1%
V
1%
(min Load) - V
O
(max Load)
O
Figure 2. Load Regulation and ∆I
V
in
0.1 µF
LM317
I
Adj
Adjust
L
R
L
(max Load)
*
+
C
1.0 µF
O
R
L
(min Load)
*Pulse testing required.
*1% Duty Cycle is suggested.
(min Load) - V
V
Load Regulation (% VO) = x 100
/Load Test Circuit
Adj
V
out
240
R
1
1%
O
VO (min Load)
I
L
V
ref
(max Load)
O
R
+
1.0 µFC
O
V
(min Load)
O
(max Load)
V
O
L
V
O
24 V
14 V
f = 120 Hz
* Pulse testing required.
* 1% Duty Cycle is suggested.
V
in
C
0.1 µF
in
I
SET
R
2
1%
: V
To Calculate R
To Calculate R2: Assume I
= I
2
out
Figure 3. Standard Test Circuit
V
LM317
R
2
Adjust
1.65 k
1%
out
240
R
1
1%
+
C
10 µF
Adj
SET R2
SET
+ 1.250 V
= 5.25 mA
*
D
1
1N4002
R
+
L
1.0 µF
C
O
V
= 10 V
out
V
O
*D
Discharges C
1
if output is shorted to Ground.
Adj
Figure 4. Ripple Rejection Test Circuit
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0.4
0.2
0
-0.2
-0.4
-0.6
, OUTPUT VOLTAGE CHANGE (%)
-0.8
out
∆V
-1.0
-50 -25 0 25 50 75 100 125 150
µI
70
65
60
55
50
45
, ADJUSTMENT PIN CURRENT ( A)
40
Adj
35
-50 -25 0 25 50 75 100 125 150
LM317
4.0
3.0
IL = 0.5 A
2.0
= 1.5 A
I
L
Vin = 15 V
V
= 10 V
out
, JUNCTION TEMPERATURE (°C)
T
J
, OUTPUT CURRENT (A)
out
I
1.0
Figure 5. Load Regulation Figure 6. Current Limit
3.0
2.5
2.0
, INPUT-OUTPUT VOLTAGE
DIFFERENTIAL (Vdc)
1.5
in out
V-V
1.0
, JUNCTION TEMPERATURE (°C)
T
J
T
= 25°C
J
150°C
0
010203040
V
, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
in-Vout
∆V
= 100 mV
out
-50 -25 0 25 50 75 100 125 150
T
, JUNCTION TEMPERATURE (°C)
J
55°C
IL = 1.5 A
1.0 A
500 mA
200 mA
20 mA
1.26
1.25
1.24
1.23
ref
V , REFERENCE VOLTAGE (V)
1.22
Figure 7. Adjustment Pin Current Figure 8. Dropout Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
, QUIESCENT CURRENT (mA)
1.0
B
I
0.5
-50 -25 0 25 50 75 100 125 150
T
, JUNCTION TEMPERATURE (°C)
J
0
010203040
Vin-V
, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
out
Figure 9. Temperature Stability Figure 10. Minimum Operating Current
T
= -55°C
J
+25°C
+150°C
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LM317
0
100
C
= 10 µF
Adj
80
Without C
60
Adj
40
Vin - V
= 5 V
out
20
RR, RIPPLE REJECTION (dB)
IL = 500 mA
f = 120 Hz
T
= 25°C
J
0
0 5.0 10 15 20 25 30 35
, OUTPUT VOLTAGE (V)
V
out
Figure 11. Ripple Rejection versus Output Voltage Figure 12. Ripple Rejection versus
100
80
60
40
20
RR, RIPPLE REJECTION (dB)
0
10 100 1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)
IL = 500 mA
Vin = 15 V
V
= 10 V
out
T
= 25°C
J
C
= 10 µF
Adj
Without C
Adj
120
100
80
60
40
Vin = 15 V
V
= 10 V
out
RR, RIPPLE REJECTION (dB)
20
f = 120 Hz
T
= 25°C
J
0
0.01 0.1 1.0 1
IO, OUTPUT CURRENT (A)
Output Current
1
10
Ω, OUTPUT IMPEDANCE ()
0
10
-1
10
-2
10
O
Z
-3
10
Vin = 15 V
V
= 10 V
out
IL = 500 mA
T
= 25°C
J
Without C
Adj
C
= 10 µF
Adj
10 100 1.0 k 10 k 100 k 1.0 M
f, FREQUENCY (Hz)
C
= 10 µF
Adj
Without C
Adj
Figure 13. Ripple Rejection versus Frequency
1.5
1.0
out
0.5
∆V
0
VOLTAGE DEVIATION (V)
-0.5
-1.0
-1.5
1.0
, INPUT , OUTPUT
in
0.5
V
∆
0
VOTLAGE CHANGE (V)
010203040
V
= 10 V
out
IL = 50 mA
T
= 25°C
J
C
= 1.0 µF;
L
C
= 10 µF
Adj
V
t, TIME (µs)
Figure 15. Line Transient Response Figure 16. Load Transient Response
in
CL = 0;
Without C
Figure 14. Output Impedance
3.0
2.0
C
= 1.0 µF;
1.0
, OUTPUT
out
∆V
-1.0
-2.0
VOLTAGE DEVIATION (V)
-3.0
, LOAD
L
I
1.5
1.0
0.5
Adj
CURRENT (A)
L
C
= 10 µF
Adj
0
Vin = 15 V
V
= 10 V
CL = 0;
Without C
Adj
out
INL = 50 mA
T
= 25°C
J
I
L
0
010203040
t, TIME (µs)
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LM317
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM317 is a 3–terminal floating regulator. In
operation, the LM317 develops and maintains a nominal
1.25 V reference (V
) between its output and adjustment
ref
terminals. This reference voltage is converted to a
programming current (I
) by R1 (see Figure 17), and this
PROG
constant current flows through R2 to ground.
The regulated output voltage is given by:
R
2
V
V
ref
1
out
Since the current from the adjustment terminal (I
I
R
2
R
Adj
1
Adj
represents an error term in the equation, the LM317 was
designed to control I
to less than 100 µA and keep it
Adj
constant. To do this, all quiescent operating current is
returned to the output terminal. This imposes the
requirement for a minimum load current. If the load current
is less than this minimum, the output voltage will rise.
Since the LM317 is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
V
in
LM317
Adjust
V
out
+
R
V
ref
1
I
PROG
V
out
External Capacitors
A 0.1 µF disc or 1.0 µF tantalum input bypass capacitor
(C
) is recommended to reduce the sensitivity to input line
in
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (C
ripple from being amplified as the output voltage is
increased. A 10 µF capacitor should improve ripple
rejection about 15 dB at 120 Hz in a 10 V application.
Although the LM317 is stable with no output capacitance,
like any feedback circuit, certain values of external
)
capacitance can cause excessive ringing. An output
capacitance (C
) in the form of a 1.0 µF tantalum or 25 µF
O
aluminum electrolytic capacitor on the output swamps this
effect and insures stability.
Protection Diodes
When external capacitors are used with any IC regulator
it is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 18 shows the LM317 with the recommended
protection diodes for output voltages in excess of 25 V or
high capacitance values (C
> 25 µF, C
O
> 10 µF). Diode
Adj
D1 prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor C
discharging through the IC during an output short circuit.
The combination of diodes D
and D2 prevents C
1
discharging through the IC during an input short circuit.
) prevents
Adj
Adj
Adj
from
I
V
= 1.25 V Typical
ref
Adj
R
2
V
out
Figure 17. Basic Circuit Configuration
Load Regulation
The LM317 is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
degrading regulation. The ground end of R
can be returned
2
near the load ground to provide remote ground sensing and
improve load regulation.
D
1
1N4002
V
in
LM317
C
in
Adjust
R
V
out
+
R
1
2
C
D
2
Adj
1N4002
C
O
Figure 18. Voltage Regulator with Protection Diodes
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7
LM317
80
P
for T
D(max)
70
Free Air
= +50°C
A
Mounted
JAθ
R , THERMAL RESISTANCE
60
50
JUNCTIONTOAIR ( C/W)°
40
30
Vertically
010203025155.0
Minimum
Size Pad
R
θ
JA
2.0 oz. Copper
L
L, LENGTH OF COPPER (mm)
Figure 19. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
D6*
3.5
3.0
L
2.5
2.0
1.5
, MAXIMUM POWER DISSIPATION (W)
D
P
1.0
V
32 V to 40 V
in
V
in1
LM317
(1)
V
0.1 µF
Adjust 1
Current
Limit
Adjust
* Diodes D1 and D2 and transistor Q2 are added to
* allow adjustment of output voltage to 0 V.
* D6 protects both LM317's during an input short circuit.
Figure 20. ‘‘Laboratory’’ Power Supply with Adjustable Current Limit and Output Voltage
out1
1N4002
R
SC
1.0K
Q
1
2N3822
-10 V
V
in2
D
1
1N4001
D
2
1N4001
LM317
5.0 k
Q
2
2N5640
(2)
-10 V
Adjust 2
1N4001
IN4001
V
out 2
240 D
Voltage
Adjust
D
3
Output Range:0 ≤ V
D
Output Range:0 ≤ IO ≤ 1.5 A
4
5
IN4001
+
10 µF
I
out
+
1.0 µF
Tantalum
O
V
out
≤ 25 V
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LM317
LM317
720
D1*
1N4002
V
out
120
Minimum V
MPS2222
1.0 k
+
1.0 µF
= 1.25 V
out
V
R
+25 V
V
in
LM317
out
1.25
Adjust
* To provide current limiting of I
* ground, the source of the FET must be tied to a
to the system
O
* negative voltage below - 1.25 V.
V
- I
I
Omax
DSS
DSS
ref
+ I
DSS
+ 1.25 V + VSS,
< IO < 1.5 A.
R1 =
V
< BV
O
I
Lmin
As shown 0 < IO < 1.0 A.
V
ref
R
≤
2
I
DDS
1
100
I
out
V
in
D
R
2
1
1N4001
D
2
1N4001
Adjust
2N5640
VSS*
protects the device during an input short circuit.
* D
1
Figure 21. Adjustable Current Limiter Figure 22. 5.0 V Electronic Shutdown Regulator
V
V
in
LM317
V
out
240
1N4001
in
LM317
V
R
out
1
I
out
TTL
Control
I
I
out
10 mA ≤ I
Adj
V
1.25V
R
out
ref
I
R
1
1
≤ 1.5 A
Adj
Adjust
50 k
R
2
MPS2907
+
Adjust
10 µF
Figure 23. Slow Turn–On Regulator Figure 24. Current Regulator
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LM317
PACKAGE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 221A–09
ISSUE AA
SEATING
–T–
PLANE
B
4
Q
123
F
T
A
U
C
S
H
K
Z
L
V
R
J
G
D
N
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.
DIM MIN MAX MIN MAX
A 0.570 0.620 14.48 15.75
B 0.380 0.405 9.66 10.28
C 0.160 0.190 4.07 4.82
D 0.025 0.035 0.64 0.88
F 0.142 0.147 3.61 3.73
G 0.095 0.105 2.42 2.66
H 0.110 0.155 2.80 3.93
J 0.018 0.025 0.46 0.64
K 0.500 0.562 12.70 14.27
L 0.045 0.060 1.15 1.52
N 0.190 0.210 4.83 5.33
Q 0.100 0.120 2.54 3.04
R 0.080 0.110 2.04 2.79
S 0.045 0.055 1.15 1.39
T 0.235 0.255 5.97 6.47
U 0.000 0.050 0.00 1.27
V 0.045 --- 1.15 ---
Z --- 0.080 --- 2.04
MILLIMETERSINCHES
D2T SUFFIX
PLASTIC PACKAGE
CASE 936–03
2
PAK)
(D
ISSUE B
K
B
F
J
D
0.010 (0.254) T
M
C
A
12 3
G
OPTIONAL
CHAMFER
E
–T
–
TERMINAL 4
U
S
V
H
M
L
P
N
R
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS
A AND K.
4. DIMENSIONS U AND V ESTABLISH A MINIMUM
MOUNTING SURFACE FOR TERMINAL 4.
5. DIMENSIONS A AND B DO NOT INCLUDE MOLD
FLASH OR GATE PROTRUSIONS. MOLD FLASH
AND GATE PROTRUSIONS NOT TO EXCEED
0.025 (0.635) MAXIMUM.
INCHES
DIMAMIN MAX MIN MAX
0.386 0.403 9.804 10.236
B 0.356 0.368 9.042 9.347
C 0.170 0.180 4.318 4.572
D 0.026 0.036 0.660 0.914
E 0.045 0.055 1.143 1.397
F 0.051 REF 1.295 REF
G 0.100 BSC 2.540 BSC
H 0.539 0.579 13.691 14.707
J 0.125 MAX 3.175 MAX
K 0.050 REF 1.270 REF
L 0.000 0.010 0.000 0.254
M 0.088 0.102 2.235 2.591
N 0.018 0.026 0.457 0.660
P 0.058 0.078 1.473 1.981
R
S 0.116 REF 2.946 REF
U 0.200 MIN 5.080 MIN
V 0.250 MIN 6.350 MIN
MILLIMETERS
5 REF5 REF
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Notes
LM317
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11
LM317
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