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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Linear integrated circuits Voltage regulation.

The LM is an adjustable analogue to the popular 78xx fixed regulators. 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.

The LM negative complement to l312 LM regulates voltages below, rather than above, the reference. How the adjustment pin is connected determines the output voltage as follows.

Archived from the original on 17 December Archived from the original PDF on 18 April Because some quiescent current flows from the adjustment pin of the device, an error term is added:.

Ddatasheet come scotta questo transistor. In other projects Wikimedia Commons. The output current is that datashedt from dropping the reference voltage across the resistor.


The LM is a popular adjustable positive linear voltage regulator. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. However, the 78xx device’s quiescent current is substantially higher and less stable. Dagasheet 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.

LM 데이터시트(PDF) – TI store

Archived from the original PDF on 31 March Views Read Edit View history. From Wikipedia, the free encyclopedia. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. By using this site, you agree to the Terms of Use and Privacy Policy. This page was last edited on 6 Julyat Retrieved 31 March In use an LM commonly requires a heat sink to prevent the operating temperature rising too high.

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. Failure to do this may cause the circuit to short.

LM312 Datasheet PDF

If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.


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 has three pins: 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 “.

Wikimedia Commons has media related to LM and Voltage regulator circuits. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground. It was designed by Robert “Bob” Pease. Retrieved from ” https: The LM relates in the same way to the fixed 79xx regulators.

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