Product details

Output options Adjustable Output, Fixed Output Iout (Max) (A) 1.5 Vin (Max) (V) 29 Vin (Min) (V) 2.6 Vout (Max) (V) 27.5 Vout (Min) (V) 1.25 Fixed output options (V) 1.8, 2.5, 3.3, 5 Noise (uVrms) 38 Iq (Typ) (mA) 2 Thermal resistance θJA (°C/W) 23 Rating Catalog Load capacitance (Min) (µF) 10 Regulated outputs (#) 1 Features Accuracy (%) 2 PSRR @ 100 KHz (dB) 30 Dropout voltage (Vdo) (Typ) (mV) 1300 Operating temperature range (C) 0 to 125, -40 to 125
Output options Adjustable Output, Fixed Output Iout (Max) (A) 1.5 Vin (Max) (V) 29 Vin (Min) (V) 2.6 Vout (Max) (V) 27.5 Vout (Min) (V) 1.25 Fixed output options (V) 1.8, 2.5, 3.3, 5 Noise (uVrms) 38 Iq (Typ) (mA) 2 Thermal resistance θJA (°C/W) 23 Rating Catalog Load capacitance (Min) (µF) 10 Regulated outputs (#) 1 Features Accuracy (%) 2 PSRR @ 100 KHz (dB) 30 Dropout voltage (Vdo) (Typ) (mV) 1300 Operating temperature range (C) 0 to 125, -40 to 125
TO-220 (NDE) 3 47 mm² 10.16 x 4.58 TO-263 (KTT) 3 155 mm² 10.16 x 15.24 WSON (NGN) 8 16 mm² 4 x 4
  • Available in Fixed 1.8-V, 2.5-V, 3.3-V, 5-V
  • Available in Adjustable Version
  • Current Limiting and Thermal Protection
  • 2% Output Accuracy
  • Output Current 1.5 A
  • Line Regulation 0.015% (Typical)
  • Load Regulation 0.1% (Typical)
  • Maximum Input Voltage up to 29V
  • Minimum Adjustable Output Voltage Down to 1.25V
  • Stable with Ceramic Output Capacitor with ESR
  • Temperature Range : -40°C to 125°C
  • Available in Fixed 1.8-V, 2.5-V, 3.3-V, 5-V
  • Available in Adjustable Version
  • Current Limiting and Thermal Protection
  • 2% Output Accuracy
  • Output Current 1.5 A
  • Line Regulation 0.015% (Typical)
  • Load Regulation 0.1% (Typical)
  • Maximum Input Voltage up to 29V
  • Minimum Adjustable Output Voltage Down to 1.25V
  • Stable with Ceramic Output Capacitor with ESR
  • Temperature Range : -40°C to 125°C

The LM1086 is a regulator with a maximum dropout of 1.5 V at 1.5 A of load current. The device has the same pin-out as TI’s industry standard LM317.

Two resistors are required to set the output voltage of the adjustable output voltage version of the LM1086. Fixed output voltage versions integrate the adjust resistors. Typically, no input capacitor is needed unless the device is situated more than 6 inches from the input filter capacitors. Output capacitor can be replaced with ceramic and appropriate ESR.

The LM1086 circuit includes a zener trimmed bandgap reference, current limiting, and thermal shutdown. Because the LM1086 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. 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 LM1086 can be also used as a precision current regulator.

For applications requiring greater output current, refer to LM1084 (clickable link) for the 5-A version, and the LM1085 (clickable link) for the 3-A version.

The LM1086 is a regulator with a maximum dropout of 1.5 V at 1.5 A of load current. The device has the same pin-out as TI’s industry standard LM317.

Two resistors are required to set the output voltage of the adjustable output voltage version of the LM1086. Fixed output voltage versions integrate the adjust resistors. Typically, no input capacitor is needed unless the device is situated more than 6 inches from the input filter capacitors. Output capacitor can be replaced with ceramic and appropriate ESR.

The LM1086 circuit includes a zener trimmed bandgap reference, current limiting, and thermal shutdown. Because the LM1086 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. 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 LM1086 can be also used as a precision current regulator.

For applications requiring greater output current, refer to LM1084 (clickable link) for the 5-A version, and the LM1085 (clickable link) for the 3-A version.

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Technical documentation

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Type Title Date
* Data sheet LM1086 1.5-A Low Dropout Positive Voltage Regulators datasheet (Rev. J) 23 Apr 2015
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Application note LDO PSRR Measurement Simplified (Rev. A) 09 Aug 2017
Selection guide TI Components for Aerospace and Defense Guide (Rev. E) 22 Mar 2017
Technical article Create a simple LED driver 20 Oct 2015
Application note Linear power for automated industrial systems 09 Jan 2015
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 Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 05 May 2013
More literature Die D/S LM1086-ADJ MDC 1.5A Low Dropout Positive Regulators 12 Sep 2012
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 Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999

Design & development

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

Evaluation board

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Simulation model

LM1086-ADJ Unencrypted PSpice Transient Model

SNVMB32.ZIP (2 KB) - PSpice Model
Simulation model

LM1086-ADJ PSpice Transient Model

SNVMB33.ZIP (72 KB) - PSpice Model
Simulation model

LM1086-5.0V PSpice Transient Model

SNVMB34.ZIP (72 KB) - PSpice Model
Simulation model

LM1086-5.0V Unencrypted PSpice Transient Model

SNVMB35.ZIP (2 KB) - PSpice Model
Simulation model

LM1086-3.3V Unencrypted PSpice Transient Model

SNVMB36.ZIP (2 KB) - PSpice Model
Simulation model

LM1086-3.3V PSpice Transient Model

SNVMB37.ZIP (72 KB) - PSpice Model
Simulation model

LM1086-2.5V Unencrypted PSpice Transient Model

SNVMB38.ZIP (2 KB) - PSpice Model
Simulation model

LM1086-2.5V PSpice Transient Model

SNVMB39.ZIP (72 KB) - PSpice Model
Simulation model

LM1086-1.8V Unencrypted PSpice Transient Model

SNVMB40.ZIP (2 KB) - PSpice Model
Simulation model

LM1086-1.8V PSpice Transient Model

SNVMB41.ZIP (72 KB) - PSpice Model
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DDPAK/TO-263 (KTT) 3 View options
TO-220 (NDE) 3 View options
WSON (NGN) 8 View options

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