LM1084IS-ADJ National Semiconductor, LM1084IS-ADJ Datasheet

Linear Voltage Regulator IC

LM1084IS-ADJ

Manufacturer Part Number
LM1084IS-ADJ
Description
Linear Voltage Regulator IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1084IS-ADJ

No. Of Pins
3
Output Current
1.5A
Termination Type
Through Hole
Mounting Type
Through Hole
Output Voltage Min
1.25V
Voltage Regulator Type
LDO Linear
Peak Reflow Compatible (260 C)
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

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TI
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37 826
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NSC
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2 160
© 2005 National Semiconductor Corporation
LM1084
5A Low Dropout Positive Regulators
General Description
The LM1084 is a series of low dropout voltage positive
regulators with a maximum dropout of 1.5V at 5A of load
current. It has the same pin-out as National Semiconductor’s
industry standard LM317.
The LM1084 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 intergrate the adjust resistors.
The LM1084 circuit includes a zener trimmed bandgap ref-
erence, current limiting and thermal shutdown.
The LM1084 series is available in TO-220 and TO-263 pack-
ages. Refer to the LM1085 for the 3A version, and the
LM1086 for the 1.5A version.
Connection Diagrams
Basic Functional Diagram, Adjustable Version
Top View
Top View
TO-220
TO-263
10094635
10094636
DS100946
10094665
Features
n Available in 3.3V, 5.0V, 12V and Adjustable Versions
n Current Limiting and Thermal Protection
n Output Current
n Industrial Temperature Range
n Line Regulation
n Load Regulation
Applications
n Post Regulator for Switching DC/DC Conveter
n High Efficiency Linear Regulators
n Battery Charger
1.2V to 15V Adjustable Regulator
Application Circuit
0.015% (typical)
−40˚C to 125˚C
10094652
0.1% (typical)
www.national.com
June 2005
5A

Related parts for LM1084IS-ADJ

LM1084IS-ADJ Summary of contents

Page 1

... General Description The LM1084 is a series of low dropout voltage positive regulators with a maximum dropout of 1. load current. It has the same pin-out as National Semiconductor’s industry standard LM317. The LM1084 is available in an adjustable version, which can set the output voltage with only two external resistors also available in three fixed voltages: 3 ...

Page 2

... Ordering Information Package Temperature Range 3-lead TO-263 −40˚C to +125˚C 3-lead TO-220 −40˚ 125˚C Simplified Schematic www.national.com Part Number Transport Media LM1084IS-ADJ Rails LM1084ISX-ADJ Tape and Reel LM1084IS-12 Rails LM1084ISX-12 Tape and Reel LM1084IS-3.3 Rails LM1084ISX-3.3 Tape and Reel LM1084IS-5 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Input to Output Voltage Differential LM1084-ADJ LM1084-12 LM1084-3.3 LM1084-5.0 Power Dissipation (Note 2) Electrical Characteristics Typicals and limits appearing in normal type apply for T tion temperature range for operation ...

Page 4

Electrical Characteristics Typicals and limits appearing in normal type apply for T tion temperature range for operation. Symbol Parameter I Current Limit LM1084-ADJ LIMIT V − −V IN LM1084-3 LM1084-5 LM1084- Minimum ...

Page 5

Typical Performance Characteristics Dropout Voltage (V −V IN Load Regulation LM1084-ADJ Ripple Rejection vs Current ) OUT 10094663 10094638 10094690 5 Short-Circuit Current 10094671 LM1084-ADJ Ripple Rejection 10094643 Temperature Stability 10094625 www.national.com ...

Page 6

Typical Performance Characteristics Adjust Pin Current LM1084-ADJ LineTransient Response www.national.com (Continued) LM1084-ADJ Load Transient Response 10094626 Maximum Power Dissipation 10094670 6 10094669 10094668 ...

Page 7

Application Note GENERAL Figure 1 shows a basic functional diagram for the LM1084- Adj (excluding protection circuitry) . The topology is basically that of the LM317 except for the pass transistor. Instead of a Darlingtion NPN with its two diode ...

Page 8

Application Note (Continued) Figure 3 shows a typical application using a fixed output regulator. Rt1 and Rt2 are the line resistances. V than the V by the sum of the voltage drops along the line OUT resistances. In this case, ...

Page 9

Application Note (Continued) must be added, one for case to heat-sink (θ heatsink to ambient (θ ). The junction temperature can be HA predicted as follows: + θ + θ (θ ...

Page 10

Typical Applications 5V to 3.3V, 5A Regulator Adjustable @ 1.2V to 15V Adjustable Regulator 5V Regulator with Shutdown www.national.com 10094667 10094650 5V 10094652 10094653 10 10094654 Battery Charger 10094655 Adjustable Fixed Regulator 10094656 Regulator with Reference 10094657 High Current Lamp ...

Page 11

Typical Applications (Continued) Battery Backup Regulated Supply Ripple Rejection Enhancement Automatic Light control 10094659 Generating Negative Supply voltage 10094660 Remote Sensing 11 10094661 10094662 10094658 www.national.com ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 3-Lead TO-263 NS Package Number TS3B 3-Lead TO-220 NS Package Number T03B 12 ...

Page 13

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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