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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National Semiconductor

The output current is that resulting from dropping the reference voltage across the resistor. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage datashet between input and output. LM series offers full overload protection available only in. In addition to higher performance than fixed regulators, the.

National Semiconductor – datasheet pdf

LMH datasheet and specification datasheet. Further, both line and load regulation are better than. Layout Top Side Note: Page 27 Notes 27 www.

Maximum Allowable Power Dissipation vs. Archived from the original PDF on 18 April Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. Because some quiescent current flows from the adjustment pin of the device, an error term is added:. Page 17 Regulator Full output current not available at high input-output voltages High Current Adjustable Regulator 17 Power Follower www. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit.


This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. LM can be used as a precision current regulator.

The guaranteed specifications apply only for the test conditions listed. Application Datasheeg In operation, the LM develops a nominal 1. Included on the chip are current limit, thermal overload. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1.

For guaranteed specifications and test conditions, see the Electrical Characteristics.

Also, it makes an especially simple adjustable switching reg. Retrieved 31 March Copy your embed code and put on your site: Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.

Page 12 Layout Top Side Note: The device can be dataxheet 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 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 dtasheet parts of the datasehet 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 voltage for V ref e. Wikimedia Commons has media related to LM and Voltage regulator circuits. The LM is an adjustable analogue to the popular 78xx fixed regulators.

Views Read Edit View history. Page 8 Line Transient Response www. However, the 78xx device’s quiescent current is substantially higher and less stable.

Archived from the original on 17 December Failure to do this may cause the circuit to short. Besides replacing fixed regulators, the LM is useful in a. From Wikipedia, the free encyclopedia.

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