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© Semiconductor Components Industries, LLC, 2004
August, 2004 − Rev. 12
1
Publication Order Number:
LM317M/D
LM317M
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
Pb−Free Packages are Available
Figure 1. Simplified Application
* = 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.
Since IAdj is controlled to less than 100 mA, the error associated with this
term is negligible in most applications.
LM317M
Vin
Vout
R1
240
R2
Adjust
IAdj
*
Cin
0.1
mF
**
+ C
O
1.0
mF
Vin
Vout
Vout + 1.25 V 1 )
R2
R1
) IAdj R2
TO−220AB
T SUFFIX
CASE 221A
1
2
3
PIN ASSIGNMENT
1
2
3Vin
Adjust
Vout
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
1
2
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
SOT−223
ST SUFFIX
CASE 318E
DPAK
DT SUFFIX
CASE 369C
Heatsink surface
connected to Pin 2
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1 2
3
4
See general marking information in the device marking
section on page 13 of this data sheet.
DEVICE MARKING INFORMATION
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