Extended Temperature Adjustable Linear Regulator with Short Circuit Protection - LM117

LM117 (ACTIVE)

Extended Temperature Adjustable Linear Regulator with Short Circuit Protection

 

Recommended alternative parts

  • LM2941  -  Lower Dropout Voltage, +/- Transient Protection

Description

The LM117 and LM317-N series of adjustable 3-pin positive voltage regulators are capable of supplying in excess of 1.5 A over a 1.25-V to 37-V output range and a wide temperature range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators.

The LM117 and LM317-N offer full overload protection such as current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the regulator is and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. That is, avoid short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM117 and LM317-N can be also used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground, which programs the output to 1.25 V where most loads draw little current.

For applications requiring greater output current, see data sheets for LM150 series (3 A), SNVS772, and LM138 series (5 A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.

Features

  • Typ. 0.1% Load Regulation
  • Typ. 0.01%/V Line Regulation
  • 1.5-A Output Current
  • Adjustable Output Down to 1.25 V
  • Current Limit Constant With Temperature
  • 80-dB Ripple Rejection
  • Short-Circuit Protected Output
  • −55°C to 150°C Operating Temperature
    Range (LM117)

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Related end equipment

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Parametrics Compare all products in Linear Regulators (LDO)

 
Output Options
Iout (Max) (A)
Vin (Max) (V)
Vin (Min) (V)
Vout (Min) (V)
Package Group
Additional Features
Operating Temperature Range (C)
Noise (uVrms)
Rating
Output Capacitor Type
Vdo (Typ) (mV)
Iq (Typ) (mA)
Package Size (mm2=WxL)
LM117
Adjustable Output    
1.5    
40    
4.2    
1.25    
TO
TO-3    
Overcurrent Protection
Thermal Shutdown    
-55 to 150    
75    
Catalog    
Non-Ceramic    
1200    
5    
3TO: 92 mm2: 9.14 x 10.03
2TO-3: 969 mm2: 24.89 x 38.94