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Product details

Parameters

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 Approx. price (US$) 8.86 | 1ku Load capacitance (Min) (µF) 0 Rating Catalog 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 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

TO-CAN (NDS) 2 969 mm² 38.94 x 24.89 TO-CAN (NDT) 3 92 mm² 10.03 x 9.14 open-in-new Find other Linear regulators (LDO)

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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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.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LM2941 ACTIVE 1-A, 26-V, high-PSRR, adjustable low-dropout voltage regulator with enable from -40°C to +125°C This product is a lower dropout (500mV), 1-A LDO regulator.

Technical documentation

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Type Title Date
* Datasheet LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator datasheet (Rev. P) Oct. 30, 2015
Application notes A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Selection guides TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017
Application notes AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) May 06, 2013
Application notes AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) May 06, 2013
Application notes AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application notes AN-173 IC Zener Eases Reference Design (Rev. B) May 05, 2013
Application notes AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) May 05, 2013
Application notes AN-181 3-Terminal Regulator is Adjustable (Rev. B) May 05, 2013
Application notes AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) May 05, 2013
Application notes Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
Application notes Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise (Rev. B) May 05, 2013
Application notes Packaging Limits Range of Linear Regulators May 08, 2010
Application notes Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
Application notes A New Production Technique for Trimming Voltage Regulators Oct. 03, 2002
Application notes High Voltage Adjustable Power Supplies Oct. 03, 2002
Application notes Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999

Design & development

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CAD/CAE symbols

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TO (NDT) 3 View options
TO-3 (NDS) 2 View options

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