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.

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The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. 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 voltage for V ref e.

LM Datasheet(PDF) – TI store

For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. 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.

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 “.


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

Archived from the original PDF on 31 March It was designed by Robert “Bob” Pease. Accidenti come scotta questo transistor. This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components.

Wikimedia Commons has media related to LM and Voltage regulator circuits. From Wikipedia, the free encyclopedia.

National Semiconductor – datasheet pdf

Views Read Edit View history. Archived from the original on 17 December Archived from the original PDF on 18 April Retrieved from ” https: How the adjustment pin is connected determines the output voltage as follows. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. Linear integrated circuits Voltage regulation.

The LM is a popular adjustable positive linear voltage regulator. The 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.

If the adjustment pin is connected to ground the output pin delivers a regulated voltage datashret 1. However, the 78xx device’s quiescent current is substantially higher and less stable.


The LM is an adjustable analogue to the popular 78xx fixed regulators. Failure to do this may cause the circuit to short. This page was last edited on 6 Julyat By using this site, you agree to the Terms of Use and Privacy Policy.

National Semiconductor

Retrieved 31 March Because some quiescent current flows from the adjustment pin of the device, an error term is added:. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. The LM has three pins: The LM relates in the same way to the fixed 79xx regulators. The LM negative complement to the LM regulates voltages below, rather than above, the reference.

The device can 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. The output current is that resulting from dropping the reference voltage across the resistor. In other projects Wikimedia Commons. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.