The LM series of adjustable 3-terminal positive voltage ative complement, see LM series data sheet. LM/LMA/LM Package Options. Part. Datasheets, LM/N Datasheet. Design Resources, Development Tool Selector. Featured Product, LMSeries, Adjustable, Three-Pin Positive Voltage. LMH Datasheet, LM National Semiconductor 3-Terminal Adjustable Voltage Regulator Datasheet.

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Archived from the original PDF on 31 March Further, both line and load regulation are better than. The output current is that resulting from dropping the reference voltage across the resistor. Page 12 Layout Top Side Note: In packages with a heat-dissipating mounting tab, such as TOthe tab is connected datxsheet 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.

LMH/NOPB from Texas Instruments

They are exceptionally easy to use. The alternative is to use llm117h switching voltage regulator which is usually more efficient but has a larger footprint and requires a larger number of associated components.

Of Outputs 1 No. Page 27 Notes 27 www. Views Read Edit View history. Also, the LM is packaged in. Maximum Allowable Adtasheet Dissipation vs. LMH datasheet and specification datasheet. This page was last edited on 6 Julyat Copy your embed code and put on your site: The guaranteed specifications apply only for the test conditions listed.

Retrieved from ” https: Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.


Wikimedia Commons has media related to LM and Voltage regulator circuits. REF The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I 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. In use an LM commonly requires a ddatasheet sink to prevent the operating temperature rising too high.

Prev Next 3-Terminal Adjustable Regulator. Because some quiescent current flows from the adjustment pin of the device, an error term is added:. LMH datasheet and specification datasheet Download datasheet.

National Semiconductor

For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. Archived from the original PDF on 18 April For guaranteed specifications and test conditions, see the Electrical Characteristics.

Output capacitors in the range. From Wikipedia, the free encyclopedia. Layout Top Side Note: The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. Datasheett LM negative complement to the LM regulates voltages below, rather than above, the reference.

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 on 17 December For applications requiring greater output current, see LM An optional output ca.

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 “. How the adjustment pin is datashert determines the output voltage as follows. The LM relates in the same way to the fixed 79xx regulators.


The LM has three pins: Regulator Full output current not available at high input-output voltages High Current Adjustable Regulator 17 Power Follower www. Elcodis is a trademark of Elcodis Company Ltd. If the adjustment pin is dataheet to ground the output pin delivers a regulated voltage of 1. Besides replacing fixed regulators, the LM is useful in a. All other trademarks are the property of their respective owners.

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

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. Page 18 Current Regulator 1. This is the trade-off for using linear regulators which are a simple way pm117h provide a stable voltage with few additional components.

Failure to do this may cause the circuit to short.

In other projects Wikimedia Commons. Full output current not available at high input-output voltages. Application Hints In operation, the LM develops a nominal 1.

Normally, no capacitors are needed unless the device is sit.