LM317-N 3-Terminal Adjustable Regulator - LM317-N

LM317-N (ACTIVE)

LM317-N 3-Terminal Adjustable Regulator

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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)

View more

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)
PSRR @ 100KHz (dB)
Output Capacitor Type
Additional Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM317-N LM317 LM317L LM317M TL317
1.5     1.5     0.1     0.5     0.1    
Adjustable Output     Adjustable Output
Programmable Output    
Adjustable Output     Adjustable Output     Adjustable Output    
4.2     3     5     3     2.5    
40     40     35     40     35    
1.2     1.25     1.2     1.2     1.25    
37     37     32     37     32    
3.5     0.05     0.05     0.05     0.05    
2250     2000     2000     2000     2000    
4     4     4     4     4    
35       30       30    
40            
Tantalum
Non-Ceramic    
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     Catalog     Catalog     Catalog     Catalog    
0 to 125     0 to 125     -40 to 125
0 to 125    
-40 to 125     0 to 125    
2TO-3
3DDPAK/TO-263
3TO
3TO-220
3TO-252
4SOT-223    
2PFM
3DDPAK/TO-263
3TO-220
4SOT-223    
3SOT-89
3TO-92
8SOIC
8TSSOP    
3TO-252
4SOT-223    
3TO-92
8SO
8SOIC
8TSSOP    
0.43 | 1ku     0.18 | 1ku     0.09 | 1ku     0.26 | 1ku     0.26 | 1ku    

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