LM317A 1% Accurate, 1.5A Adjustable Linear Regulator with Short Circuit Protection | TI.com

LM317A (ACTIVE)

1% Accurate, 1.5A Adjustable Linear Regulator with Short Circuit Protection

 

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Other devices and data sheet

Other device variants can also be found in the   LM317A-MIL product page

This data sheet applies to both   LM317A and   LM317A-MIL

Description

The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. The LM317A device is available in an SOT-223 package, which makes it ideal for space-constrained applications that require high-performance regulation. The device is exceptionally easy to use and requires only two external resistors to set the output voltage. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators.

The LM317A offers 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 LM317A 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. Exceeding the maximum input-to-output deferential will result in short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM317A 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 (3A), SNVS772, and LM138 series (5A), SNVS771. For the negative complement, see LM137 (SNVS778) series data sheet.

Features

  • Typical 0.005%/V Line Regulation
  • 1% Output Voltage Tolerance
  • 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
  • −40°C to 125°C Operating Temperature Range

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Parametrics Compare all products in Linear regulators (LDO)

 
Output options
Iout (Max) (A)
Vin (Max) (V)
Vin (Min) (V)
Vout (Max) (V)
Vout (Min) (V)
Package Group
Features
Regulated outputs (#)
Operating temperature range (C)
Thermal Resistance θJA (°C/W)
Noise (uVrms)
Approx. price (US$)
Rating
Output capacitor type
PSRR @ 100 KHz (dB)
Accuracy (%)
Vdo (Typ) (mV)
Iq (Typ) (mA)
Package size: mm2:W x L (PKG)
LM317A LM117 LM317-N LM317HV LM317L-N
Adjustable Output     Adjustable Output     Adjustable Output     Adjustable Output     Adjustable Output    
1.5     1.5     1.5     1.5     0.1    
40     40     40     60     40    
4.2     4.2     4.2     4.2     4.2    
37     37     37     57     38    
1.2     1.25     1.2     1.25     1.2    
SOT-223 | 4
TO-220 | 3
TO-252 | 3
TO | 3    
TO-3 | 2
TO | 3    
DDPAK/TO-263 | 3
SOT-223 | 4
TO-220 | 3
TO-252 | 3    
TO-220 | 3     DSBGA | 6
SOIC | 8
TO-92 | 3    
   
   
   
   
   
1     1     1     1     1    
-40 to 125     -55 to 125
-55 to 150    
0 to 125     0 to 125     -40 to 125    
24     39     39     23     160    
38     75     35     1710     38    
0.61 | 1ku     7.52 | 1ku     0.43 | 1ku     0.95 | 1ku     0.21 | 1ku    
Catalog     Catalog     Catalog     Catalog     Catalog    
Non-Ceramic     Non-Ceramic     Non-Ceramic    
   
   
40     40     40     40     63    
5     4     5     5     3    
2250     1200     2250     2250     1800    
0.05     5     3.5     0.05     0.05    
4SOT-223: 46 mm2: 7 x 6.5 (SOT-223 | 4)
3TO: 92 mm2: 9.14 x 10.03 (TO | 3)
See datasheet (TO-220)
3TO-252: 40 mm2: 6.1 x 6.58 (TO-252 | 3)    
3TO: 92 mm2: 9.14 x 10.03 (TO | 3)
2TO-3: 969 mm2: 24.89 x 38.94 (TO-3 | 2)    
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)
3TO-252: 40 mm2: 6.1 x 6.58 (TO-252 | 3)    
See datasheet (TO-220)     See datasheet (DSBGA)
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
3TO-92: 19 mm2: 3.68 x 5.2 (TO-92 | 3)    

Design tool

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WEBENCH® Designer LM317A

  Min   Max Range
Vin  V 4.2 to 40.0V
Vout  V 1.25 to 37V
Iout  A ≤ 1.5A
Ambient Temp  °C -40 to 125°C