LM1085 Regulators Datasheet

LM1085 Datasheet, PDF, Equivalent


Part Number

LM1085

Description

3-A Low Dropout Positive Regulators

Manufacture

etcTI

Total Page 29 Pages
Datasheet
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LM1085
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LM1085
SNVS038H – JULY 1999 – REVISED JANUARY 2015
LM1085 3-A Low Dropout Positive Regulators
1 Features
1 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)
2 Applications
• High Efficiency Linear Regulators
• Battery Charger
• Post Regulation for Switching Supplies
• Constant Current Regulator
• Microprocessor Supply
3 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM1085
DDPAK/TO-263 (3) 10.18 mm × 8.41 mm
TO-220 (3)
14.986 mm × 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM1085
LM1085
SNVS038H – JULY 1999 – REVISED JANUARY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings ............................................................ 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 13
8.1 Application Information............................................ 13
8.2 Typical Applications ................................................ 13
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 20
10.3 Thermal Considerations ........................................ 20
11 Device and Documentation Support ................. 22
11.1 Documentation Support ........................................ 22
11.2 Trademarks ........................................................... 22
11.3 Electrostatic Discharge Caution ............................ 22
11.4 Glossary ................................................................ 22
12 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision H (March 2013) to Revision I
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 4
Changes from Revision F (March 2013) to Revision G
Page
• Deleted layout of National Data Sheet to TI format.............................................................................................................. 19
2 Submit Documentation Feedback
Product Folder Links: LM1085
Copyright © 1999–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM1085 SNVS038H – JULY 199 9 – REVISED JANUARY 2015 LM1085 3-A L ow Dropout Positive Regulators 1 Featu res •1 Available in 3.3-V, 5.0-V, 12- V and Adjustable Versions • Current L imiting and Thermal Protection • Outp ut Current 3 A • Line Regulation 0.01 5% (typical) • Load Regulation 0.1% ( typical) 2 Applications • High Effici ency Linear Regulators • Battery Char ger • Post Regulation for Switching S upplies • Constant Current Regulator • Microprocessor Supply 3 Descriptio n The LM1085 is a regulator with a maxi mum dropout of 1.5 V at 3 A of load cur rent. It has the same pinout as TI's in dustry standard LM317. Two resistors ar e required to set the output voltage of the adjustable output voltage version of the LM1085. Fixed output voltage ver sions integrate the adjust resistors. T he LM1085 circuit includes a zener trim med bandgap reference, current limiting and thermal shutdown. Refer to the LM1084 for t.
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