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LM317L
ON Semiconductor
100 mA Adjustable Output,
Positive Voltage Regulator
LM317L
The LM317L is an adjustable 3–terminal positive voltage regulator
capable of supplying in excess of 100 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 them essentially blow–out proof.
The LM317L 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 LM317L can be used as a
precision current regulator.
•
LOW CURRENT
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
Output Current in Excess of 100 mA
•
Output Adjustable Between 1.2 V and 37 V
Z SUFFIX
PLASTIC PACKAGE
CASE 29
•
Internal Thermal Overload Protection
•
Internal Short Circuit Current Limiting
•
Output Transistor Safe–Area Compensation
Pin 1. Adjust
2. V out
3. V in
1 2
•
Floating Operation for High Voltage Applications
3
•
Standard 3–Lead Transistor Package
•
Eliminates Stocking Many Fixed Voltages
Simplified Application
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8*)
Pin 1. V in
2. V out
3. V out
4. Adjust
5. N.C.
6. V out
7. V out
8. N.C.
V in
V out
8
LM317L
1
I Adj
R 1
240
*SOP–8 is an internally modified SO–8 package.
Pins 2, 3, 6 and 7 are electrically common to the
die attach flag. This internal lead frame modifi-
cation decreases package thermal resistance
and increases power dissipation capability
when appropriately mounted on a printed circuit
board. SOP–8 conforms to all external dimen-
sions of the standard SO–8 package.
C in *
0.1 m F
Adjust
+
C O **
1.0 m F
R 2
* 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.
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
V out 1.25V
1 R R 1 I Adj R 2
LM317LD
LM317LZ
T J = 0 ° to +125 ° C
SOP–8
Plastic
LM317LBD
SOP–8
T J = –40 ° to +125 ° C
Since I Adj is controlled to less than 100 m A, the error
associated with this term is negligible in most applications.
LM317LBZ
Plastic
W Semiconductor Components Industries, LLC, 2002
January, 2002 – Rev. 3
1
Publication Order Number:
LM317L/D
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LM317L
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input–Output Voltage Differential
V I –V O
40
Vdc
Power Dissipation
P D
Internally Limited
W
Operating Junction Temperature Range
T J
–40 to +125
° C
Storage Temperature Range
T stg
–65 to +150
°
C
ELECTRICAL CHARACTERISTICS (V I –V O = 5.0 V; I O = 40 mA; T J = T low to T high [Note 1]; I max and P max [Note 2];
unless otherwise noted.)
LM317L, LB
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 3)
T A = 25 ° C, 3.0 V 3 V I – V O 3 40 V
1
Reg line
–
0.01
0.04
%/V
Load Regulation (Note 3), T A = 25 ° C
10 mA 3 I O 3 I max – LM317L
V O 3 5.0 V
V O
2
Reg load
.
5.0 V
–
–
5.0
0.1
25
0.5
mV
% V O
Adjustment Pin Current
3
I Adj
–
50
100
m A
Adjustment Pin Current Change
2.5 V
1, 2
D
I Adj
–
0.2
5.0
m
A
3
V I – V O
3
40 V, P D
3
P max
10 mA
3
I O
3
I max – LM317L
Reference Voltage
3.0 V 3 V I – V O 3 40 V, P D 3 P max
10 mA 3 I O 3 I max – LM317L
3
V ref
1.20
1.25
1.30
V
Line Regulation (Note 3)
3.0 V
1
Reg line
–
0.02
0.07
%/V
3
V I – V O
3
40 V
Load Regulation (Note 3)
10 mA
2
Reg load
3
I O
3
I max – LM317L
V O 3 5.0 V
V O . 5.0 V
–
–
20
0.3
70
1.5
mV
% V O
Temperature Stability (T low
3
T J
3
T high )
3
T S
–
0.7
–
% V O
Minimum Load Current to Maintain Regulation (V I – V O = 40 V)
3
I Lmin
–
3.5
10
mA
Maximum Output Current
V I – V O 3 6.25 V, P D 3 P max , Z Package
V I – V O 3 40 V, P D 3 P max , T A = 25 ° C, Z Package
3
I max
mA
100
–
200
20
–
–
RMS Noise, % of V O
T A = 25
N
–
0.003
–
% V O
°
C, 10 Hz
3
f
3
10 kHz
Ripple Rejection (Note 4)
V O = 1.2 V, f = 120 Hz
C Adj = 10
4
RR
dB
m
F, V O = 10.0 V
60
–
80
80
–
–
Long Term Stability, T J = T high (Note 5)
T A = 25 ° C for Endpoint Measurements
3
S
–
0.3
1.0
%/1.0 k
Hrs.
Thermal Resistance, Junction–to–Case
Z Package
R q JC
–
83
–
° C/W
Thermal Resistance, Junction–to–Air
Z Package
R q JA
–
160
–
° C/W
NOTES: 1. T low to T high = 0 ° to +125 ° C for LM317L
–40 ° to +125 ° C for LM317LB
2. I max = 100 mA P max = 625 mW
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.
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LM317L
Representative Schematic Diagram
V in
300
300
300
3.0k
30
0
70
6.8V
6.8V
350
18k
8.67k
500
130
200
k
5.1k
40
0
6.3V
180 180
2.0k
6.0k
10
pF
60
2.5
10
pF
V out
2.4k
12.8k
5
0
Adjust
V CC
V OH - V OL
Line Regulation (%/V) =
x 100
*
V OL
V IH
V OH
V OL
V IL V in
V out
LM317L
Adjust
R 1
240
1%
R L
+
C in
0.1 m F
I Adj
C O
1 m F
*Pulse Testing Required:
1% Duty Cycle is suggested.
R2
1
%
Figure 1. Line Regulation and D I Adj /Line Test Circuit
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LM317L
Load Regulation (mV) = V O (min Load) -V O (max Load)
Load Regulation (% V O ) =
V O (min Load) - V O (max Load)
X
100
V O (min Load)
V O (min Load)
V O (max Load)
V in *
V in
V out
LM317L
I L
240
1%
R L
(max Load)
R L
(min Load)
Adjust
R 1
*
+
C in
0.1 m F
I Adj
C O
1.0 m F
R 2
1%
*Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 2. Load Regulation and D I Adj / Load Test Circuit
V in
LM317L
V out
I L
Adjust
240
1%
R 1
V ref
R L
I Adj
+
V I
C in
0.1 m F
C O
1 m F
V O
I SET
R 2
1%
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 3. Standard Test Circuit
14.30V
4.30V
V in
V out
V out = 1.25 V
LM317L
f = 120 Hz
Adjust
R 1
240
1%
D 1 *
1N4002
R L
+
C in
0.1 m F
C O
1 m F
V O
1.65K
1%
+
R 2
**
10 m F
*D 1 Discharges C Adj if Output is Shorted to Ground.
**C Adj provides an AC ground to the adjust pin.
Figure 4. Ripple Rejection Test Circuit
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LM317L
0.4
V in = 45 V
V out = 5.0 V
I L = 5.0 mA to 40 mA
0.2
80
0
-0.2
70
-0.4
V in = 10 V
V out = 5.0 V
I L = 5.0 mA to 100 mA
I L = 40 mA
f = 120 Hz
V out = 10 V
V in = 14 V to 24 V
-0.6
60
-0.8
-1.0
50
-50 -25
0
25
50
75
100 125 150
-50 -25
0
25
50
75
100 125
150
T J , JUNCTION TEMPERATURE ( ° C)
T J , JUNCTION TEMPERATURE ( ° C)
Figure 5. Load Regulation
Figure 6. Ripple Rejection
0.50
2.5
T J = 25 ° C
0.40
2.0
I L = 100 mA
0.30
1.5
0.20
T J = 150 ° C
I L = 5.0 mA
0.10
1.0
0
0
10
20
30
40
50
0.5
-50 -25
0
25
50
75
100 125
150
V in -V out , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
T J , JUNCTION TEMPERATURE ( ° C)
Figure 7. Current Limit
Figure 8. Dropout Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
T J = 55 ° C
T J = 25 ° C
T J = 150 ° C
100
90
80
70
60
50
40
30
20
10
I L = 40 mA
V in = 5.0 V ± 1.0 V PP
V out = 1.25 V
0
10 20 30 40
V in -V out , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
10
100
1.0 k
10 k 100 k 1.0 M
f, FREQUENCY (Hz)
Figure 9. Minimum Operating Current
Figure 10. Ripple Rejection versus Frequency
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