Updated : Nov 07, 2019 in Medical


The LM LM are adjustable 3-terminal negative volt- age regulators capable of supplying in excess of b1 5A over an output voltage range of b1 2V to . The LM/LM are adjustable 3-terminal negative volt- .. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction. LM/LMN 3-Terminal Adjustable Negative Regulators. Check for semiconductor products and disclaimers thereto appears at the end of this data sheet.

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Retrieved from ” https: The LM is an adjustable analogue to the popular 78xx fixed regulators. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. The LM negative complement to the LM regulates voltages below, rather than above, the reference.

LM Datasheet(PDF) – National Semiconductor (TI)

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. From Wikipedia, the free km137.

The output current is that resulting from dropping the reference voltage across the resistor. The device can be configured to regulate the current to a load, rather than the voltage, by replacing lj137 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 “.

Archived from the original PDF on 31 Datasheeet This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. This page was last edited on 6 Julyat Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Linear integrated circuits Voltage regulation. Wikimedia Commons has media related to LM and Voltage regulator circuits.

LM Datasheet PDF – Texas Instruments

Accidenti come scotta questo transistor. The LM is a popular adjustable positive linear voltage regulator. The mechanism used is similar enough that a voltage divider datahseet 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.

Views Read Edit View history. The LM has three pins: In other projects Wikimedia Commons.

LM137 Datasheet

If the adjustment pin is connected to datasyeet the output pin delivers a regulated voltage of 1. By using this site, you agree to the Terms of Use and Privacy Policy. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground. However, the 78xx device’s quiescent current is substantially higher and less stable. How the adjustment pin is connected determines the output voltage as follows.


LM137 Datasheet PDF

Retrieved 31 Datasheeet For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary.

Because some quiescent current flows from the adjustment pin of the device, an error term is added:. 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. Archived from the original PDF on 18 April Archived from the original on 17 December It was designed by Robert “Bob” Pease. Because of this, the error term in the formula cannot be ignored and the value dahasheet the low-side resistor becomes more critical.

The LM relates in the same way to the fixed 79xx regulators.