(ACTIVE) 3-pin and 4-pin 1.5-A adjustable positive voltage regulator


Functional Diagram


The LM317 device 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 requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even if the ADJUST terminal is disconnected.


  • 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


Output Options Adjustable Output    
Iout (Max) (A) 1.5    
Vin (Max) (V) 40    
Vin (Min) (V) 3    
Vout (Max) (V) 37    
Vout (Min) (V) 1.25    
Package Group DDPAK/TO-263|3^SOT-223|4^TO-220|3    
Features N/A    
Regulated Outputs (#) 1    
Operating Temperature Range (C) 0 to 125    
Thermal Resistance θJA (°C/W) 24    
Noise (uVrms) 38    
Approx. price (US$) 0.18 | 1ku    
Rating Catalog    
Output Capacitor Type Non-Ceramic    
PSRR @ 100KHz (dB) 38    
Accuracy (%) 5    
Vdo (Typ) (mV) 2000    
Iq (Typ) (mA) 3.5    
Package Size: mm2:W x L (PKG) 3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263|3)^4SOT-223: 46 mm2: 7 x 6.5 (SOT-223|4)^See datasheet (TO-220)    

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