LM1085 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – 3A Low Dropout Positive Regulators

LM1085
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SNVS038G – JULY 1999 – REVISED MARCH 2013
LM1085 3A Low Dropout Positive Regulators
Check for Samples: LM1085
FEATURES
1
•2 Available in 3.3V, 5.0V, 12V and Adjustable
Versions
• Current Limiting and Thermal Protection
• Output Current 3A
• Line Regulation 0.015% (typical)
• Load Regulation 0.1% (typical)
APPLICATIONS
• High Efficiency Linear Regulators
• Battery Charger
• Post Regulation for Switching Supplies
• Constant Current Regulator
• Microprocessor Supply
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 TI'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 reference, current limiting and thermal
shutdown.
The LM1085 series is available in TO-220 and
DDPAK/TO-263 packages. Refer to the LM1084 for
the 5A version, and the LM1086 for the 1.5A version.
Connection Diagram
Figure 1. TO-220 Top View
Figure 2. DDPAK/TO-263 Top View
Figure 3. Basic Functional Diagram, Adjustable
Version
Figure 4. Application Circuit
1.2V to 15V Adjustable Regulator
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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