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ON Semiconductor - 500mA, Positive Voltage Regulator

Numéro de référence LM317M
Description 500mA, Positive Voltage Regulator
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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LM317M fiche technique
LM317M, NCV317MA,
NCV317M
500 mA Adjustable Output,
Positive Voltage Regulator
The LM317M is an adjustable three−terminal 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. Further, it employs internal current limiting, thermal
shutdown and safe area compensation, making it essentially blow−out
proof.
The LM317M serves a wide variety of applications including local,
on−card regulation. This device also makes an especially simple
adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the
LM317M can be used as a precision current regulator.
Features
Output Current in Excess of 500 mA
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
Eliminates Stocking Many Fixed Voltages
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
These are Pb−Free Devices
Vin
Vin
LM317M
Vout
Vout
*
Cin
0.1mF
IAdj Adjust
R1
240
**
+ CO
1.0mF
R2
 * = 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. Simplified Application
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 24
1
http://onsemi.com
Heatsink surface
connected to Pin 2
TO−220AB
T SUFFIX
CASE 221AB
SOT−223
ST SUFFIX
CASE 318E
1
2
3
1
23
DPAK
DT SUFFIX
CASE 369C
4
12
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
PIN ASSIGNMENT
1 Adjust
2 Vout
3 Vin
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 11 of this data sheet.
Publication Order Number:
LM317M/D

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