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What is LM317?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "THREE.TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR".


LM317 Datasheet PDF - ON Semiconductor

Part Number LM317
Description THREE.TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 

1. Adjustable output voltage: The LM317 can provide a wide range of adjustable output voltages, making it suitable for a wide range of applications.

2. High input voltage: The device can handle input voltages as high as 40V, making it suitable for use in circuits that require high voltage regulation.

3. Low dropout voltage: The low dropout voltage of the IC makes it suitable for use in circuits that require a stable output voltage even when the input voltage is close to the output voltage.

4. Short-circuit and thermal overload protection: The built-in protection features of the LM317 make it robust and reliable in different operating conditions.


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LM317, NCV317
1.5 A Adjustable Output,
Positive Voltage Regulator
The LM317 is an adjustable 3terminal 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 blowout 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.
Features
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 SafeArea Compensation
Floating Operation for High Voltage Applications
Available in Surface Mount D2PAK3, and Standard 3Lead
Transistor Package
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AECQ100
Qualified and PPAP Capable
Eliminates Stocking many Fixed Voltages
These are PbFree Devices
Vin
Cin*
0.1 mF
LM317
IAdj Adjust
R2
Vout
R1
240
+ CO**
1.0 mF
http://onsemi.com
12
3
D2PAK3
D2T SUFFIX
CASE 936
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
TO220
T SUFFIX
CASE 221AB
1
2
3
Pin 1. Adjust
2. Vout
3. Vin
Heatsink surface connected to Pin 2.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
** Cin is required if regulator is located an appreciable distance from power supply filter.
** CO is not needed for stability, however, it does improve transient response.
ǒ ǓVout  +  1.25 V 
1
)
R2
R1
)  IAdj R2
Since IAdj is controlled to less than 100 mA, the error associated with this term is
negligible in most applications.
Figure 1. Standard Application
Semiconductor Components Industries, LLC, 2013
April, 2013 Rev. 13
1
Publication Order Number:
LM317/D

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LM317 equivalent
LM317, NCV317
0.4
0.2
0
-0.2
-0.4
-0.6
Vin = 15 V
Vout = 10 V
-0.8
IL = 0.5 A
IL = 1.5 A
-1.0
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (C)
Figure 7. Load Regulation
4.0
3.0
TJ = 25C
2.0
150C
1.0
-55C
0
0 10 20 30 40
Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure 8. Current Limit
70
65
60
55
50
45
40
35
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (C)
Figure 9. Adjustment Pin Current
3.0
DVout = 100 mV
2.5
IL = 1.5 A
1.0 A
2.0
500 mA
1.5
200 mA
20 mA
1.0
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (C)
Figure 10. Dropout Voltage
1.26
1.25
1.24
1.23
1.22
-50 -25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (C)
Figure 11. Temperature Stability
5.0
4.5
TJ = -55C
4.0
+25C
3.5
+150C
3.0
2.5
2.0
1.5
1.0
0.5
0
0 10 20 30 40
Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure 12. Minimum Operating Current
http://onsemi.com
5


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LM317 datasheet


1. Voltage Regulator - Fairchild

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