Product details

Output options Adjustable Output Iout (Max) (A) 1.5 Vin (Max) (V) 40 Vin (Min) (V) 4.2 Vout (Max) (V) 37 Vout (Min) (V) 1.25 Noise (uVrms) 75 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 39 Rating Military Load capacitance (Min) (µF) 0 Regulated outputs (#) 1 Features Accuracy (%) 4 PSRR @ 100 KHz (dB) 40 Dropout voltage (Vdo) (Typ) (mV) 1200 Operating temperature range (C) -55 to 150, -55 to 125
Output options Adjustable Output Iout (Max) (A) 1.5 Vin (Max) (V) 40 Vin (Min) (V) 4.2 Vout (Max) (V) 37 Vout (Min) (V) 1.25 Noise (uVrms) 75 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 39 Rating Military Load capacitance (Min) (µF) 0 Regulated outputs (#) 1 Features Accuracy (%) 4 PSRR @ 100 KHz (dB) 40 Dropout voltage (Vdo) (Typ) (mV) 1200 Operating temperature range (C) -55 to 150, -55 to 125
TO-CAN (NDS) 2 969 mm² 38.94 x 24.89 TO-CAN (NDT) 3 92 mm² 10.03 x 9.14
  • For a newer drop-in alternative, see the LM317
  • 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)
  • For a newer drop-in alternative, see the LM317
  • 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)

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 the LM150 series (3 A) and LM138 series (5 A) data sheets. For the negative complement, see the LM137 series data sheet.

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 the LM150 series (3 A) and LM138 series (5 A) data sheets. For the negative complement, see the LM137 series data sheet.

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Technical documentation

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Type Title Date
* Data sheet LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator datasheet (Rev. Q) 10 Jun 2020
Technical article 3 quiescent-current (Iq) specifications you need to understand 12 Nov 2021
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 06 May 2013
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) 06 May 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 06 May 2013
Application note AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) 05 May 2013
Application note AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) 05 May 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 05 May 2013
Application note Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise (Rev. B) 05 May 2013
Application note Packaging Limits Range of Linear Regulators 08 May 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 04 Jun 2008
Application note A New Production Technique for Trimming Voltage Regulators 03 Oct 2002
Application note High Voltage Adjustable Power Supplies 03 Oct 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999

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