(ACTIVE) Space Saving 800mA Low-Dropout Linear Regulator with Internal Current Limit


Functional diagram


The LM1117 is a low dropout voltage regulator with a dropout of 1.2 V at 800 mA of load current.

The LM1117 is available in an adjustable version, which can set the output voltage from 1.25 to 13.8 V with only two external resistors. In addition, it is available in five fixed voltages, 1.8 V, 2.5 V, 3.3 V, and 5 V.

The LM1117 offers current limiting and thermal shutdown. Its circuit includes a Zener trimmed bandgap reference to assure output voltage accuracy to within ±1%.

A minimum of 10-µF tantalum capacitor is required at the output to improve the transient response and stability.


  • Available in 1.8 V, 2.5 V, 3.3 V, 5 V,
    and Adjustable Versions
  • Space-Saving SOT-223 and WSON Packages
  • Current Limiting and Thermal Protection
  • Output Current 800 mA
  • Line Regulation 0.2% (Maximum)
  • Load Regulation 0.4% (Maximum)
  • Temperature Range
    • LM1117: 0°C to 125°C
    • LM1117I: –40°C to 125°C


Iout (Max) (A) 0.8   
Output Options Adjustable Output^Fixed Output   
Vin (Min) (V) 2.6   
Vin (Max) (V) 15   
Fixed Output Options (V) 1.8^2.5^3.3^5   
Vout (Min) (V) 1.25   
Vout (Max) (V) 13.8   
Iq (Typ) (mA) 5   
Vdo (Typ) (mV) 1200   
Accuracy (%) 3   
Noise (uVrms) 38   
PSRR @ 100KHz (dB) 47   
Output Capacitor Type Non-Ceramic   
Rating Catalog   
Operating Temperature Range (C) -40 to 125^0 to 125   
Pin/Package 3DDPAK/TO-263^3TO-220^3TO-252^4SOT-223^8WSON   

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