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LM1085

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3-A, 29-V, linear voltage regulator

Data sheet
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3-A, 29-V, linear voltage regulator

LM1085

ACTIVE
Data sheet Order now

Product details

Parameters

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 Approx. price (US$) 0.60 | 1ku 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 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

TO-220 (NDE) 3 47 mm² 10.16 x 4.58 TO-263 (KTT) 3 155 mm² 10.16 x 15.24 open-in-new Find other Linear regulators (LDO)

Features

  • 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)
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Description

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
* Datasheet LM1085 3-A Low Dropout Positive Regulators datasheet (Rev. H) Jan. 09, 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
Selection guides Low Dropout Regulators Quick Reference Guide (Rev. P) Mar. 21, 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 Linear power for automated industrial systems Jan. 09, 2015
Selection guides Power Management for Xilinx FPGAs Feb. 04, 2014
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 Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
Selection guides Power Management for Altera FPGAs (Rev. E) Feb. 22, 2012
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 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.

Design tools & simulation

SIMULATION MODELS Download
SNVM613.ZIP (34 KB) - PSpice Model
SIMULATION MODELS Download
SNVM614.ZIP (34 KB) - PSpice Model
SIMULATION MODELS Download
SNVM615.ZIP (34 KB) - PSpice Model
SIMULATION MODELS Download
SNVM618.ZIP (34 KB) - PSpice Model
SIMULATION MODELS Download
SNVM999.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA00.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA01.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA02.ZIP (1 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Thermal Printing with the PRU-ICSS on the BeagleBone Black Reference Design
TIDEP0056 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DDPAK/TO-263 (KTT) 3 View options
TO-220 (NDE) 3 View options

Ordering & quality

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Training series

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Videos

LDO Architecture Review

This training gives an overview of the functional blocks internal to an LDO

Posted: 11-Jan-2017
Duration: 23:22

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