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Details for Texas Instruments


1.5-A adjustable output linear regulator
Buy Directly from Texas Instruments (3788 in Stock)
$0.5600 per unit
Series Information for LM317MDT/NOPB - Texas Instruments


  • feature
    1.5-A Output Current
  • feature
    80-dB Ripple Rejection
  • feature
    Adjustable Output Down to 1.25 V
  • feature
    Current Limit Constant With Temperature
  • feature
    Short-Circuit Protected Output
  • feature
    Typ. 0.01%/V Line Regulation
  • feature
    Typ. 0.1% Load Regulation
  • feature
    u221255u00b0C to 150u00b0C Operating Temperature Range


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 floating 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.


Output Type:
Input Voltage Min:
Input Voltage Max:
Fixed Output Voltage Nom.:
Adjustable Output Voltage Min:
Adjustable Output Voltage Max:

Alternate Descriptions

Avnet America

Standard Regulator Pos 1.2V to 37V 0.5A 3-Pin(2+Tab) TO-252 Rail

Avnet America product

Avnet Europe

Standard Regulator Pos 1.2V to 37V 0.5A 3-Pin(2+Tab) TO-252 Rail

Avnet Europe product

Texas Instruments

1.5-A adjustable output linear regulator

Texas Instruments product


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