LM317M
3-Terminal 0.5A Positive Adjustable Regulator
Features
Description
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The LM317M is a 3-terminal adjustable 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.
Output Current in Excess of 0.5 A
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
D-PAK
2
1 3
1. Adj 2. Output 3. Input
TO-220 (Single Gauge)
12 3
Ordering Information
Product Number
Marking
Package
Packing Method Operating Temperature
LM317MDTX
LM317MDT
TO-252 3L (D-PAK)
Tape and Reel
LM317MDTXM
LM317MDT
TO-252 3L (D-PAK)
Tape and Reel
LM317MT
LM317M
TO-220 3L (Single Gauge)
Rail
0 to +125°C
* Refer to below unit orientation figure for TM / TF suffix packing.
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
September 2014
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Block Diagram
Input
V in 3
+
-
P rote ction
Circ uitry
V olta ge
Re fe re nce
R lim it
2
Vo
Output
1
V ad j
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
VI - VO
TJ
TSTG
Parameter
Input-Output Voltage Differential
Operating Junction Temperature Range
Storage Temperature Range
Value
Unit
40
V
0 to +125
°C
-65 to +125
°C
Thermal Characteristics
Values are at TA = 25°C unless otherwise noted.
Value
Symbol
PD
Parameter
LM317MT
Power Dissipation
LM317MDTX /
LM317MDTXM(1),(2)
Internally Limited
Unit
W
RθJC
Thermal Resistance, Junction to Case
5
-
°C/W
RθJA
Thermal Resistance, Junction to Ambient
81
100
°C/W
Notes:
1. Thermal resistance test board - size: 76.2 mm x 114.3 mm x 1.6 mm (1S0P),
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
2
VI - VO = 5 V, IO = 0.1 A, 0°C ≤ TJ ≤ +125°C, PDMAX = 7.5 W, unless otherwise specified.
Symbol
Rline
Rload
IADJ
Parameter
Line Regulation(3)
Load Regulation(3)
Conditions
Min.
Typ.
TA = +25°C, 3 V ≤ VI −VO ≤ 40 V
0.01
0.04
0.02
0.07
TA = +25°C, 10 mA ≤ IO ≤ 0.5 A,
VO ≤ 5 V
5
25
mV
TA = +25°C, 10 mA ≤ IO ≤ 0.5 A,
VO ≥ 5 V
0.1
0.5
%/VO
10 mA ≤ IO ≤ 0.5 A, VO ≤ 5 V
20
70
mV
0.3
1.5
%/VO
-
50
100
μA
0.2
5.0
μA
1.25
1.30
V
Adjustment Pin Current
3 V ≤ VI - VO ≤ 40 V,
10 mA ≤ IO ≤ 0.5 A, PD < PDMAX
VREF
Reference Voltage
3 V < VI - VO < 40 V,
10 mA ≤ IO ≤ 0.5 A, PD < PDMAX
STT
Temperature Stability
TJ = 0°C to +125°C
0.7
Minimum Load Current to
Maintain Regulation
VI - VO = 40 V
3.5
eN
RR
ST
1.20
VI - VO ≤ 15 V, PD < PDMAX
0.5
0.9
Maximum Output Current
VI - VO = 40 V
PD < PDMAX, TA = +25°C
0.15
0.25
RMS Noise, % of VOUT
TA = +25°C, 10 Hz < f < 10 kHz
Ripple Rejection
Long-Term Stability
%/ V
10 mA ≤ IO ≤ 0.5 A, VO ≥ 5V
Adjustment Pin Current Change
IO(MAX)
Unit
3 V ≤ VI −VO ≤ 40 V
ΔIADJ
IL(MIN)
Max.
VO = 10 V, f = 120 Hz,
without CADJ
%/VO
10.0
A
0.003
66
mA
%/VO
65
dB
VO = 10 V, f = 120 Hz,
CADJ = 10 μF(4)
80
TJ = +125°C, 1000 Hours
0.3
1
%/
1000Hrs
Notes:
3. Load and Line regulation are specified at constant junction temperature. Change in VO due to heating effects must
be taken into account separately. Pulse testing with low duty cycle is used.
4. CADJ, when used, is connected between the adjustment pin and ground.
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
3
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Electrical Characteristics
Figure 2. Minimum Load Current
Figure 3. Peak Output Current vs. Input-Output
Differential Voltage
Figure 4. Adjustment Pin Current vs. Temperature
Figure 5. Ripple Rejection vs. Frequency
Figure 6. Load Regulation vs. Temperature
Figure 7. Line Regulation vs. Temperature
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
4
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Typical Performance Characteristics
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Typical Performance Characteristics (Continued)
Figure 8. Output Voltage vs. Temperature
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
Figure 9. Thermal Shutdown
www.fairchildsemi.com
5
D1
1N4002
Input
VO
LM317M
Output
+
120
1.0uF
VADJ
1K
720
KSP2222
TTL CONTROL
MINIMUM VO = 1.25V
Figure 10. 15V Electronic Shutdown Regulator(5)
Note:
5. D1 protects the device during an input short circuit.
VO
LM317M
Output
Input
240
1N4001
50K
VADJ
KSP2907
R2
+
1.0uF
Figure 11. Slow Turn-On Regulator
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
6
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Typical Application
IO
Input
LM317M
R1
VO
R2
Output
VADJ
IADJ
V
REF- + I
I
= ---------------≅ 1.25V
---------------- R1
OMAX
ADJ
R1
V
REF - + I
1.25V I
= --------------------≅ --------------------OMAX R1 + R2
ADJ R1 + R2
5mA < I < 500mA
O
Figure 12. Current Regulator
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
7
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Typical Application (Continued)
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Physical Dimensions
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Figure 13. 3LEAD, TO-252, JEDEC TO-252 VAR. AB, SURFACE MOUNT (DPAK)
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
8
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
Physical Dimensions (Continued)
Figure 14. TO-220, MOLDED, 3LEAD, JEDEC VARIATION AB
© 2003 Fairchild Semiconductor Corporation
LM317M Rev. 1.1.0
www.fairchildsemi.com
9
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Product Status
Advance Information
Formative / In Design
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
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Datasheet contains the design specifications for product development. Specifications may change
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Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
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Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Rev. I71
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