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Linear & low-dropout (LDO) regulators

LM317L

ACTIVE

100-mA, 35-V, adjustable linear voltage regulator

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Data sheet

LM317L

ACTIVE
Data sheet Order now

Product details

Rating Catalog Vin (max) (V) 40 Vin (min) (V) 3.75 Iout (max) (A) 0.1 Output options Adjustable Output Vout (max) (V) 37 Vout (min) (V) 1.25 Noise (µVrms) 30 PSRR at 100 KHz (dB) 65 Iq (typ) (mA) 0.05 Features Over Current Protection, Over Temperature Protection Thermal resistance θJA (°C/W) 44, 96.5, 97.1, 139.5, 149.4 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 4 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
Rating Catalog Vin (max) (V) 40 Vin (min) (V) 3.75 Iout (max) (A) 0.1 Output options Adjustable Output Vout (max) (V) 37 Vout (min) (V) 1.25 Noise (µVrms) 30 PSRR at 100 KHz (dB) 65 Iq (typ) (mA) 0.05 Features Over Current Protection, Over Temperature Protection Thermal resistance θJA (°C/W) 44, 96.5, 97.1, 139.5, 149.4 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 4 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
SOT-89 (PK) 3 18.4275 mm² (4.5 mm × 4.095 mm) TO-92 (LP) 3 19.136 mm² (5.2 mm × 3.68 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) TSSOP (PW) 8 19.2 mm² (3 mm × 6.4 mm)
  • Output voltage range (VO):
    • Adjustable 1.25V to 37V
  • Output current: Up to 100mA
  • No output capacitor required for stability
  • Accuracy:
    • Input regulation typically 0.007% per input voltage change
    • Output regulation typically 0.5%
  • Ripple rejection typically:
    • 71.5dB at 120Hz
  • Package options:
    • SOIC
    • SOT-89
    • TO-92 (legacy chip only)
    • TSSOP (legacy chip only)
  • For higher output current requirements, see LM317M (500mA) and LM317 (1.5A)
  • Output voltage range (VO):
    • Adjustable 1.25V to 37V
  • Output current: Up to 100mA
  • No output capacitor required for stability
  • Accuracy:
    • Input regulation typically 0.007% per input voltage change
    • Output regulation typically 0.5%
  • Ripple rejection typically:
    • 71.5dB at 120Hz
  • Package options:
    • SOIC
    • SOT-89
    • TO-92 (legacy chip only)
    • TSSOP (legacy chip only)
  • For higher output current requirements, see LM317M (500mA) and LM317 (1.5A)

The LM317L is an adjustable, 3-terminal, positive-voltage regulator capable of supplying up to 100mA over an output-voltage range of 1.25V to 37V. The device is exceptionally easy to use and requires only two external resistors to set the output voltage.

The LM317L uses floating topology and sees only the input-to-output differential voltage. Therefore, a supply of several hundred volts can be regulated, provided the maximum input-to-output differential is not exceeded.

No capacitors are needed unless the LM317L is located far 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 new chip is characterized for the junction temperature range of –40°C to +125°C for both the LM317LC and LM317LI series.

The LM317L is an adjustable, 3-terminal, positive-voltage regulator capable of supplying up to 100mA over an output-voltage range of 1.25V to 37V. The device is exceptionally easy to use and requires only two external resistors to set the output voltage.

The LM317L uses floating topology and sees only the input-to-output differential voltage. Therefore, a supply of several hundred volts can be regulated, provided the maximum input-to-output differential is not exceeded.

No capacitors are needed unless the LM317L is located far 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 new chip is characterized for the junction temperature range of –40°C to +125°C for both the LM317LC and LM317LI series.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM317L 100mA Adjustable Floating Voltage Regulator datasheet (Rev. G) PDF | HTML Aug 19, 2026
Application note Cost-Optimized, High-Performance Front-End Design for Analog Input Modules PDF | HTML Jun 22, 2022
Application note LDO Noise Demystified (Rev. B) PDF | HTML Aug 18, 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun 27, 2019
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML Aug 9, 2017
Application note AB-12 Wide Adjustable Range PNP Voltage Regulator (Rev. B) May 6, 2013
Application note AN-42 IC Provides On-Card Regulation for Logic Circuits (Rev. B) May 6, 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 6, 2013
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) May 6, 2013
Application note AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) May 5, 2013
Application note AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) May 5, 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 5, 2013
Application note High-Efficiency Reg has Low Drop-Out Voltage (Rev. B) Apr 23, 2013
Application note AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) Apr 23, 2013
Application note Packaging Limits Range of Linear Regulators May 8, 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun 4, 2008
Application note High Stability Regulators Oct 3, 2002
Application note A New Production Technique for Trimming Voltage Regulators Oct 3, 2002
Application note Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems Oct 3, 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators Oct 21, 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LM317L PSpice Transient Model

SNVMAW4.ZIP (65 KB) - PSpice model
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Simulation model

LM317L Unencrypted PSpice Transient Model

SNVMAW3.ZIP (2 KB) - PSpice model
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Package Pins CAD symbols, footprints & 3D models
SOT-89 (PK) 3 Ultra Librarian
TO-92 (LP) 3 Ultra Librarian
SOIC (D) 8 Ultra Librarian
TSSOP (PW) 8 Ultra Librarian
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