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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National Semiconductor

The mechanism used is similar enough that a voltage divider can be used in the same way as with the LM dstasheet the output follows the same formula, using the regulator’s fixed voltage for V ref e. However, the 78xx device’s quiescent current is substantially higher and less stable. From Wikipedia, the free encyclopedia. It was designed by Robert “Bob” Pease. Failure to do this may cause the circuit to short.

LM Datasheet(PDF) – TI store

Retrieved 31 March The LM negative complement to the LM regulates voltages below, rather than above, ,m312 reference. 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 “.


Archived from the lm31 PDF on 18 April Linear regulators inherently waste power, the power dissipated is the current passed multiplied datashete the voltage difference between input and output. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. Archived from the original on 17 December Wikimedia Commons has media related to LM and Voltage regulator circuits.

By using this site, you agree to the Terms of Use and Privacy Policy. 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 xatasheet of the application circuit.

For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. The LM relates in the same way to the fixed 79xx regulators.

Because of datasgeet, 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.

LM312-155.52M Datasheet

The output current is that resulting from dropping the reference voltage across the resistor. In datasneet projects Wikimedia Commons. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary.


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. Accidenti come scotta questo transistor.

LM semiconductor

This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. Archived from the original PDF on 31 March This page was last edited on 6 Julyat If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1.

Because some quiescent current flows from the adjustment pin of the device, an error term is added:.

Views Read Edit View history. The LM is a popular adjustable positive linear voltage regulator.

How the adjustment pin is connected determines the output voltage as follows. The LM is an adjustable analogue to the popular 78xx fixed regulators. 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.

Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.