3/4 Pin 1.5A Adjustable Positive Voltage Regulator - LM317

LM317 (ACTIVE)

3/4 Pin 1.5A Adjustable Positive Voltage Regulator

Recommended alternative parts

  • UA7805  -  UA780x offers only fixed voltage options and does not have the same specification as the LM317.
  • TLV1117  -  Single output LDO, 800mA internal current limit thermal overload protection

Description

The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are better than standard fixed regulators.

In addition to having higher performance than fixed regulators, this device includes on-chip current limiting, thermal overload protection, and safe operating-area protection. All overload protection remains fully functional, even if the ADJUST terminal is disconnected.

The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317 can function as a precision current regulator. An optional output capacitor can be added to improve transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are difficult to achieve with standard three-terminal regulators.

Features

  • Output Voltage Range Adjustable From 1.25 V to 37 V
  • Output Current Greater Than 1.5 A
  • Internal Short-Circuit Current Limiting
  • Thermal Overload Protection
  • Output Safe-Area Compensation

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Parametrics Compare all products in Single Channel LDO

 
Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
Noise (uVrms)
Output Capacitor Type
Additional Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM317 LM317-N LM317L LM317M TL317
1.5     1.5     0.1     0.5     0.1    
Adjustable Output
Programmable Output    
Adjustable Output     Adjustable Output
Programmable Output    
Adjustable Output     Adjustable Output    
3     4.2     5     3     2.5    
40     40     35     40     35    
1.25       1.2     1.2     1.25    
37       32     37     32    
0.05       0.05     0.05     0.05    
2000     3     2000     2000     2000    
4       4     4     4    
    30       30    
Non-Ceramic       Cap Free
Non-Ceramic    
Cap Free
Non-Ceramic    
Cap Free
Non-Ceramic    
Overcurrent Protection
Thermal Shutdown    
Overcurrent Protection
Thermal Shutdown    
Overcurrent Protection
Thermal Shutdown    
Overcurrent Protection
Thermal Shutdown    
Overcurrent Protection
Thermal Shutdown    
Catalog     Military     Catalog     Catalog     Catalog    
0 to 125     -40 to 125
0 to 125    
-40 to 125
0 to 125    
-40 to 125     0 to 125    
2PFM
3DDPAK/TO-263
3TO-220
4SOT-223    
2TO-3
3DDPAK/TO-263
3TO
3TO-220
3TO-252
4SOT-223    
3SOT-89
3TO-92
8SOIC
8TSSOP    
3TO-252
4SOT-223    
3TO-92
8SO
8SOIC
8TSSOP    
0.27 | 1ku       0.14 | 1ku     0.40 | 1ku     0.40 | 1ku    
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