IC REG POS 5V 3A LDO TO-263

 

LM1085ISX-5.0/NOPB

Manufacturer Part NumberLM1085ISX-5.0/NOPB
DescriptionIC REG POS 5V 3A LDO TO-263
ManufacturerNational Semiconductor
LM1085ISX-5.0/NOPB datasheets

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Specifications of LM1085ISX-5.0/NOPB

Regulator TopologyPositive FixedVoltage - Output5V
Voltage - Dropout (typical)1.3V @ 3ANumber Of Regulators1
Current - Output3ACurrent - Limit (min)3.2A
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / CaseTO-263-3, D²Pak (3 leads + Tab), TO-263AALead Free Status / RoHS StatusLead free / RoHS Compliant
Voltage - Input-Other names*LM1085ISX-5.0
*LM1085ISX-5.0/NOPB
LM1085ISX-5.0
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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.
Connection Diagrams
TO-220
Top View
TO-263
Top View
Basic Functional Diagram,
Adjustable Version
© 2005 National Semiconductor Corporation
Features
n Available in 3.3V, 5.0V, 12V and Adjustable Versions
n Current Limiting and Thermal Protection
n Output Current
n Line Regulation
n Load Regulation
Applications
n High Efficiency Linear Regulators
n Battery Charger
n Post Regulation for Switching Supplies
n Constant Current Regulator
n Microprocessor Supply
10094702
1.2V to 15V Adjustable Regulator
10094704
10094765
DS100947
June 2005
3A
0.015% (typical)
0.1% (typical)
Application Circuit
10094752
www.national.com

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LM1085ISX-5.0/NOPB Summary of contents

  • Page 1

    ... General Description The LM1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1. 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 also available in three fixed voltages: 3 ...

  • Page 2

    ... Part Number Transport Media LM1085IS-ADJ Rails 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 and Reel LM1085IT-ADJ Rails LM1085IT-12 Rails LM1085IT-3.3 Rails LM1085IT-5.0 Rails 2 NSC Drawing TS3B T03B 10094734 ...

  • 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 LM1085-ADJ LM1085-12 LM1085-3.3 LM1085-5.0 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 LM1085-ADJ LIMIT V − −V IN LM1085-3 LM1085-5 LM1085- Minimum ...

  • Page 5

    Typical Performance Characteristics Dropout Voltage vs. Output Current Percent Change in Output Voltage vs. Temperature Maximum Power Dissipation vs. Temperature Short-Circuit Current vs. Input/Output Difference 10094763 Adjust Pin Current vs. Temperature 10094799 Ripple Rejection vs. Frequency (LM1085-Adj.) 10094770 5 10094768 ...

  • Page 6

    Typical Performance Characteristics Ripple Rejection vs. Output Current (LM1085-Adj.) Load Transient Response www.national.com (Continued) Line Transient Response 10094744 10094771 6 10094772 ...

  • Page 7

    Application Note GENERAL Figure 1 shows a basic functional diagram for the LM1085- 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, 1.5A Regulator Adjustable @ 1.2V to 15V Adjustable Regulator 5V Regulator with Shutdown www.national.com 10094767 10094750 5V 10094752 10094753 10 10094754 Battery Charger 10094755 Adjustable Fixed Regulator 10094756 Regulator with Reference 10094757 High Current Lamp ...

  • Page 11

    Typical Applications (Continued) Battery Backup Regulated Supply Ripple Rejection Enhancement Automatic Light control 10094759 Generating Negative Supply voltage 10094760 Remote Sensing 11 10094761 10094762 10094758 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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