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LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0
September 2014
LM317M
3-Terminal 0.5A Positive Adjustable Regulator
Features
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
Ordering Information
* Refer to below unit orientation figure for TM / TF suffix packing.
Product Number Marking Package Packing Method Operating Temperature
LM317MDTX LM317MDT TO-252 3L (D-PAK) Tape and Reel 0 to +125°CLM317MDTXM LM317MDT TO-252 3L (D-PAK) Tape and Reel
LM317MT LM317M TO-220 3L (Single Gauge) Rail
Description
The LM317M is a 3-terminal adjustable positive voltage
regulator capable of supplying in excess of 500 mA over
an output volt age range of 1.2 V to 37 V. This volt age reg-
ulator is exceptionally easy to use and requires only two
external resistors to set the output voltage.
D-PAK
1. Adj 2. Output 3. Input
1
TO-220 (Single Gauge)
1
2
3
3
2
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 2
Block Diagram
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the re co mmen ded operating conditions and s tres si ng the parts to these level s i s not recommended. In addi-
tion, 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.
Thermal Characteristics
Values are at TA = 25°C unless otherwise noted.
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
Symbol Parameter Value Unit
VI - VOInput-Output Voltage Differential 40 V
TJOperating Junction Temperature Range 0 to +125 °C
TSTG Storage Temperature Range -65 to +125 °C
Symbol Parameter Value Unit
LM317MT LM317MDTX /
LM317MDTXM(1),(2)
PDPower Dissipation Internally Limited W
RθJC Thermal Resistance, Junction to Case 5 - °C/W
RθJA Thermal Resistance, Junction to Ambient 81 100 °C/W
Rlimit
3Vin
Vo
1
Voltage
Reference
Vadj
2
Protection
Circuitry
+
-
Input
Output
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 3
Electrical Characteristics
VI - VO = 5 V, IO = 0.1 A, 0°C TJ +125°C, PDMAX = 7.5 W, unless otherwise specified.
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.
Symbol Parameter Conditions Min. Typ. Max. Unit
Rline Line Regulation(3) TA = +25°C, 3 V VI VO 40 V 0.01 0.04 %/ V
3 V VI VO 40 V 0.02 0.07
Rload Load Regulation(3)
TA = +25°C, 10 mA IO 0.5 A,
VO 5 V 525mV
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
10 mA IO 0.5 A, VO 5V 0.3 1.5 %/VO
IADJ Adjustment Pin Current - 50 100 μA
ΔIADJ Adjustment Pin Current Chang e 3 V VI - VO 40 V,
10 mA IO 0.5 A, PD < PDMAX 0.2 5.0 μA
VREF Reference Voltage 3 V < VI - VO < 40 V,
10 mA IO 0.5 A, PD < PDMAX 1.20 1.25 1.30 V
STTTemperature Stability TJ = 0°C to +125°C0.7%/V
O
IL(MIN) Minimum Load Current to
Maintain Regulation VI - VO = 40 V 3.5 10.0 mA
IO(MAX) Maximum Output Current VI - VO 15 V, PD < PDMAX 0.5 0.9 A
VI - VO = 40 V
PD < PDMAX, TA = +25°C0.15 0.25
eNRMS Noise, % of VOUT TA = +25°C, 10 Hz < f < 10 kHz 0.003 %/VO
RR Ripple Rejection
VO = 10 V, f = 120 Hz,
without CADJ 66 65 dB
VO = 10 V, f = 120 Hz,
CADJ = 10 μF(4) 80
ST Long-Term Stability TJ = +125°C, 1000 Hours 0.3 1 %/
1000Hrs
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 4
Typical Performance 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
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 5
Typical Performance Characteristics (Continued)
Figure 8. Output Voltage vs. Temperature Figure 9. Thermal Shutdown
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 6
Typical Application
Figure 10. 15V Electronic Shutdown Regulator(5)
Note:
5. D1 protects the device during an input short circuit.
Figure 11. Slow Turn-On Regulator
LM317M
120
Output
Input
1K
KSP2222
720 TTL CONTROL
1.0uF
1N4002
D1
VADJ
VO
MINIMUM VO = 1.25V
+
LM317M Output
Input
KSP2907
50K 1N4001
1.0uF
+
VADJ
VO
240
R2
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 7
Typical Application (Continued)
Figure 12. Current Regulator
Output
Input R2
VO
IADJ
VADJ
R1 IO
LM317M
IOMAX VREF
R1
-----------------


IADJ 1.25V
R1
-----------------+=
IOMAX VREF
R1 R2+
----------------------


=IADJ
+1.25V
R1 R2+
----------------------
5mA IO500mA<<
LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 8
Physical Dimensions
Figure 13. 3LEAD, TO-252, JEDEC TO-252 VAR. AB, SURFACE MOUNT (DPAK)
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LM317M — 3-Terminal 0.5A Positive Adjustable Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM317M Rev. 1.1.0 9
Physical Dimensions (Continued)
Figure 14. TO-220, MOLDED, 3LEAD, JEDEC VARIATION AB
© Fairchild Semiconductor Corporation www.fairchildsemi.com
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