LM is guaranteed over a 0 C to a70 C temperature . Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is. LM datasheet, LM circuit, LM data sheet: TI – OPERATIONAL AMPLIFIERS/BUFFERS,alldatasheet, datasheet, Datasheet search site for Electronic. Part Number: LM, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet – semiconductor.

Author: Yokasa Araramar
Country: Slovenia
Language: English (Spanish)
Genre: Science
Published (Last): 23 October 2006
Pages: 19
PDF File Size: 10.9 Mb
ePub File Size: 9.86 Mb
ISBN: 111-8-93337-604-3
Downloads: 45985
Price: Free* [*Free Regsitration Required]
Uploader: Tadal

Because some quiescent current flows from the adjustment pin of the device, an dagasheet term is added:. For large voltage differences, the energy lost as datxsheet can ultimately be greater than that provided to the circuit. The LM has three pins: This page was last edited on 6 Julyat Retrieved 31 March Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.

Datzsheet alternative is to use a switching voltage regulator which is usually more efficient but has a larger footprint and requires a larger number of associated components. Failure to do this may cause the circuit to short. The LM is an adjustable analogue to the popular 78xx fixed regulators.

Views Read Edit View history. The LM relates in the same way to the fixed 79xx regulators. Accidenti come scotta questo transistor. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.


Archived from the original PDF on 18 April Wikimedia Commons has media related to LM and Voltage regulator circuits.

LM Datasheet PDF ( Pinout ) – LM LM LM Operational Amplifiers (Rev. A)

The mechanism used is similar enough that a voltage divider can be used in the same way as with the LM and the output follows the same formula, using the regulator’s fixed dataxheet for V ref e. This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. The LM is a popular adjustable positive linear voltage regulator.

Archived datasheef the original PDF on 31 March Linear integrated circuits Voltage regulation.

LM312 Datasheet PDF

Archived from the original on 17 December The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. The device datashee be configured to regulate the current to a load, rather than the voltage, by replacing the low-side resistor of the divider with the load itself.

Like the LM, each of the 78xx regulators is designed to adjust the output voltage until it is some fixed voltage above the adjustment pin which in this case is labelled ” ground “. In packages with a heat-dissipating mounting tab, such as TOthe tab is connected internally to the output pin which may make it necessary to electrically isolate the tab or the heat sink from other parts of the application circuit. The output current is that resulting from dropping the reference voltage across the resistor.


Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output.

LM Datasheet pdf – Operational Amplifier – National Semiconductor

If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. However, the 78xx device’s quiescent current is substantially higher and less stable. In l3m12 an LM commonly requires a heat sink to prevent the operating temperature rising too high. How the adjustment pin is connected determines the output voltage as follows.

National Semiconductor

Retrieved from ” https: The LM negative complement to the LM regulates voltages below, rather than above, the reference. From Wikipedia, the free encyclopedia.

By using this site, you agree to the Terms of Use and Privacy Policy. In other projects Wikimedia Commons. It was designed by Robert “Bob” Pease.