Product details

Output options Adjustable Output, Fixed Output Iout (Max) (A) 3 Vin (Max) (V) 29 Vin (Min) (V) 2.6 Vout (Max) (V) 27.5 Vout (Min) (V) 1.25 Fixed output options (V) 3.3, 5, 12 Noise (uVrms) 38 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 23 Load capacitance (Min) (µF) 10 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 4 PSRR @ 100 KHz (dB) 30 Dropout voltage (Vdo) (Typ) (mV) 1300 Operating temperature range (C) -40 to 125
Output options Adjustable Output, Fixed Output Iout (Max) (A) 3 Vin (Max) (V) 29 Vin (Min) (V) 2.6 Vout (Max) (V) 27.5 Vout (Min) (V) 1.25 Fixed output options (V) 3.3, 5, 12 Noise (uVrms) 38 Iq (Typ) (mA) 5 Thermal resistance θJA (°C/W) 23 Load capacitance (Min) (µF) 10 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 4 PSRR @ 100 KHz (dB) 30 Dropout voltage (Vdo) (Typ) (mV) 1300 Operating temperature range (C) -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
  • Available in 3.3-V, 5.0-V, 12-V and
    Adjustable Versions
  • Current Limiting and Thermal Protection
  • Output Current 3 A
  • Line Regulation 0.015% (typical)
  • Load Regulation 0.1% (typical)
  • Available in 3.3-V, 5.0-V, 12-V and
    Adjustable Versions
  • Current Limiting and Thermal Protection
  • Output Current 3 A
  • Line Regulation 0.015% (typical)
  • Load Regulation 0.1% (typical)

The LM1085 is a regulator with a maximum dropout of 1.5 V at 3 A of load current. It 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 LM1085. Fixed output voltage versions integrate the adjust resistors.

The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.

The LM1085 is a regulator with a maximum dropout of 1.5 V at 3 A of load current. It 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 LM1085. Fixed output voltage versions integrate the adjust resistors.

The LM1085 circuit includes a zener trimmed bandgap reference, current limiting and thermal shutdown.

Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5A version.

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Technical documentation

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Type Title Date
* Data sheet LM1085 3-A Low Dropout Positive Regulators datasheet (Rev. H) 09 Jan 2015
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Selection guide TI Components for Aerospace and Defense Guide (Rev. E) 22 Mar 2017
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
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.

Simulation model

LM1085_3P3 PSpice Transient Model

SNVM613.ZIP (34 KB) - PSpice Model
Simulation model

LM1085_ADJ PSpice Transient Model

SNVM614.ZIP (34 KB) - PSpice Model
Simulation model

LM1085_12P0 PSpice Transient Model

SNVM615.ZIP (34 KB) - PSpice Model
Simulation model

LM1085_5P0 PSpice Transient Model

SNVM618.ZIP (34 KB) - PSpice Model
Simulation model

LM1085_3P3 Unencrypted PSpice Transient Model

SNVM999.ZIP (1 KB) - PSpice Model
Simulation model

LM1085_5P0 Unencrypted PSpice Transient Model

SNVMA00.ZIP (1 KB) - PSpice Model
Simulation model

LM1085_12P0 Unencrypted PSpice Transient Model

SNVMA01.ZIP (1 KB) - PSpice Model
Simulation model

LM1085_ADJ Unencrypted PSpice Transient Model

SNVMA02.ZIP (1 KB) - PSpice Model
Reference designs

TIDEP0056 — Thermal Printing with the PRU-ICSS on the BeagleBone Black Reference Design

The Programmable Realtime Unit – Industrial Communications Sub-System (PRU-ICSS) is a versatile component of the AM335x SoC that enables real-time, deterministic, fast GPIO control, even when running a non-deterministic operating system. This reference design provides a concrete use case and (...)
Package Pins Download
DDPAK/TO-263 (KTT) 3 View options
TO-220 (NDE) 3 View options

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