LM305 - Voltage Regulators [Discontinued]
Datasheet Obsolete Versions Application Notes Knowledge Base

General Description


The LM105 series are positive voltage regulators similar to the LM100, except that an extra gain stage has been added for improved regulation. More...


  Typical Application
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Typical Performance


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  Additional Resources
Application Notes


Connection Diagram


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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM105/LM305/LM305A Voltage Regulators 227
Kbytes
24-Jun-99 Download

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Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM305AH
NONE
NONE
04 Sep 2001
LM305H
NONE
NONE
04 Sep 2001

General Description


The LM105 series are positive voltage regulators similar to the LM100, except that an extra gain stage has been added for improved regulation. A redesign of the biasing circuitry removes any minimum load current requirement and at the same time reduces standby current drain, permitting higher voltage operation. They are direct, plug-in replacements for the LM100 in both linear and switching regulator circuits with output voltages greater than 4.5V. Important characteristics of the circuits are:

  • Output voltage adjustable from 4.5V to 40V
  • Output currents in excess of 10A possible by adding external transistors
  • Load regulation better than 0.1%, full load with current limiting
  • DC line regulation guaranteed at 0.03%/V
  • Ripple rejection on 0.01%V
  • 45 mA output current without external pass transistor (LM305A)

Like the LM100, they also feature fast response to both load and line transients, freedom from oscillations with varying resistive and reactive loads and the ability to start reliably on any load within rating. The circuits are built on a single silicon chip and are supplied in a TO-99 metal can.

The LM105 is specified for operation for -55°C < TA < +125°C, and the LM305/LM305A is specified for 0°C < TA < +70°C.

More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-184: Application Note 184 References for A/D Converters 64
Kbytes
3-Oct-02 Download
AN-184 (Japanese): Application Note 184 References for A/D Converters
124 Kbytes   Download
AN-272: Application Note 272 Op Amp Booster Designs 382
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2-Oct-02 Download
AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise 399
Kbytes
1-Oct-02 Download
AN-161: Application Note 161 IC Voltage Reference has 1 ppm per Degree Drift 138
Kbytes
10-Oct-02 Download
AN-181: Application Note 181 3-Terminal Regulator Is Adjustable 165
Kbytes
1-May-04 Download
AN-46: The Phase Locked Loop IC as a Communication System Building Block 277
Kbytes
4-Nov-95 Download
AN-480: A 40 MHz Programmable Video Op Amp 181
Kbytes
4-Nov-95 Download

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[Information as of 8-Nov-2009]