National Instruments LM1085 Series - Manual
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Table of Contents:
- Page 2 – Ordering Information; Package; Simplified Schematic
- Page 4 – Electrical Characteristics
- Page 5 – Typical Performance Characteristics; Dropout Voltage vs. Output Current
- Page 6 – Line Transient Response
- Page 7 – Application Note
- Page 9 – FIGURE 6. Power Dissipation Diagram
- Page 10 – Typical Applications
- Page 11 – Battery Backup Regulated Supply
- Page 12 – Physical Dimensions; NS Package Number TS3B
- Page 13 – Notes; Low
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 1.5A 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
10094702
Top View
TO-263
10094704
Top View
Basic Functional Diagram,
Adjustable Version
10094765
Application Circuit
10094752
1.2V to 15V Adjustable Regulator
June 2005
LM1085
3A
Low
Dropout
Positive
Regulators
© 2005 National Semiconductor Corporation
DS100947
www.national.com
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Summary
Ordering Information Package Temperature Range Part Number Transport Media NSC Drawing 3-lead TO-263 −40˚C to +125˚C LM1085IS-ADJ Rails TS3B LM1085ISX-ADJ Tape and Reel LM1085IS-12 Rails LM1085ISX-12 Tape and Reel LM1085IS-3.3 Rails LM1085ISX-3.3 Tape and Reel LM1085IS-5.0 Rails LM1085ISX-5.0 Tape a...
Electrical Characteristics (Continued) Typicals and limits appearing in normal type apply for T J = 25˚C. Limits appearing in Boldface type apply over the entire junc- tion temperature range for operation. Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) Units I LIMIT Current Limit...
Typical Performance Characteristics Dropout Voltage vs. Output Current Short-Circuit Current vs. Input/Output Difference 10094763 10094768 Percent Change in Output Voltage vs. Temperature Adjust Pin Current vs. Temperature 10094799 10094798 Maximum Power Dissipation vs. Temperature Ripple Rejection ...
