LM1085 Regulators Datasheet

LM1085 Datasheet, PDF, Equivalent


Part Number

LM1085

Description

3A Low Dropout Positive Regulators

Manufacture

National Semiconductor

Total Page 13 Pages
Datasheet
Download LM1085 Datasheet


LM1085
August 2001
LM1085
3A Low Dropout Positive Regulators
General Description
The LM1085 is a series of low dropout positive voltage
regulators with a maximum dropout of 1.5V at 3A of load
current. It has the same pin-out as National Semiconductor’s
industry standard LM317.
The LM1085 is available in an adjustable version, which can
set the output voltage with only two external resistors. It is
also available in three fixed voltages: 3.3V, 5.0V and 12.0V.
The fixed versions integrate the adjust resistors.
The LM1085 circuit includes a zener trimmed bandgap ref-
erence, current limiting and thermal shutdown.
The LM1085 series is available in TO-220 and TO-263 pack-
ages. Refer to the LM1084 for the 5A version, and the
LM1086 for the 1.5V version.
Features
n Available in 3.3V, 5.0V, 12V and Adjustable Versions
n Current Limiting and Thermal Protection
n Output Current
3A
n Line Regulation
0.015% (typical)
n Load Regulation
0.1% (typical)
Applications
n High Efficiency Linear Regulators
n Battery Charger
n Post Regulation for Switching Supplies
n Constant Current Regulator
n Microprocessor Supply
Connection Diagrams
TO-220
TO-263
Top View
DS100947-2
Basic Functional Diagram, Adjustable Version
DS100947-4
Top View
Application Circuit
DS100947-65
DS100947-52
1.2V to 15V Adjustable Regulator
© 2001 National Semiconductor Corporation DS100947
www.national.com

LM1085
Ordering Information
Package
3-lead TO-263
Temperature Range
−40˚C to +125˚C
3-lead TO-220
−40˚C to + 125˚C
Simplified Schematic
Part Number
LM1085IS-ADJ
LM1085ISX-ADJ
LM1085IS-12
LM1085ISX-12
LM1085IS-3.3
LM1085ISX-3.3
LM1085IS-5.0
LM1085ISX-5.0
LM1085IT-ADJ
LM1085IT-12
LM1085IT-3.3
LM1085IT-5.0
Transport Media
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Rails
Rails
Rails
NSC Drawing
TS3B
T03B
www.national.com
2
DS100947-34


Features LM1085 3A Low Dropout Positive Regulator s August 2001 LM1085 3A Low Dropout Positive Regulators General Descriptio n The LM1085 is a series of low dropout positive voltage regulators with a max imum dropout of 1.5V at 3A of load curr ent. It has the same pin-out as Nationa l Semiconductor’s industry standard L M317. The LM1085 is available in an adj ustable version, which can set the outp ut voltage with only two external resis tors. It is also available in three fix ed voltages: 3.3V, 5.0V and 12.0V. The fixed versions integrate the adjust res istors. The LM1085 circuit includes a z ener trimmed bandgap reference, current limiting and thermal shutdown. The LM1 085 series is available in TO-220 and T O-263 packages. Refer to the LM1084 for the 5A version, and the LM1086 for the 1.5V version. Features n Available i n 3.3V, 5.0V, 12V and Adjustable Versio ns n Current Limiting and Thermal Prot ection n Output Current 3A n Line Re gulation 0.015% (typical) n Load Regulation 0.1% (typical) Ap.
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