An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters . LM, LM Datasheet. DS – Rev 20 – May For further information contact your local STMicroelectronics sales office. The LM, LM are monolithic integrated circuits in TO, TOFP and D²PAK packages intended for use as positive adjustable voltage regulators.

Author: Magami Malajas
Country: Djibouti
Language: English (Spanish)
Genre: Personal Growth
Published (Last): 18 February 2015
Pages: 422
PDF File Size: 3.81 Mb
ePub File Size: 6.99 Mb
ISBN: 625-6-38052-911-8
Downloads: 9805
Price: Free* [*Free Regsitration Required]
Uploader: Yojar

Product is in volume production only to support customers ongoing production.

Who We Are Management. As said earlier the IC has 3 pins, in which the input voltage is supplied to pin3 VIN then using a pair of resistors potential divider we set a voltage at pin 1 Adjust which will decide the output voltage of the IC that is given out at pin 2 VOUT. Remember, voltage regulators are just devices that regulate voltage down to a certain level.

LM3171 Datasheet

The LM Voltage Regulator is a 3-terminal adjustable voltage regulator which can supply an output voltage adjustable from 1. V IN – V IN is the pin which receives the incoming voltage which is to be regulated down to a specified voltage. However, the 78xx device’s quiescent current is substantially higher and less stable. For example, the input voltage pin can be fed 12V, which the satasheet will regulate down to 10V.

LM3171 Datasheet PDF – Fairchild Semiconductor

This page was last edited on 6 Julyat Small footprint LDOs offer Meeting portable applications’ needs. The LM is an adjustable analogue to the popular 78xx fixed regulators. Product is in volume production 0. Selectors Simulators and Models. C2 is needed if the device is far from any filter capacitors.


Adjustable 3-terminal positive voltage regulator Output voltage can be set to range from 1. Computers and Peripherals Data Center. To feed a circuit the regulated 5 volts, we just connect it to the output pin.

TL — Programmable Reference Voltage. To adjust output, we swap out resistor R2 value for a different resistance.

Getting started with eDesignSuite 5: Apart from using it as a variable voltage regulator, it can also be used as a fixed voltage regulator, current limiter, Battery charger, AC voltage regulator and even as an adjustable current regulator. C1 is optional and it’s used to clean up transient response.

We do this by changing the value of the resistor connected to the Adj pin of the voltage regulator. Buy Direct Add to cart. General terms and conditions. Below is the pinout: How to use LM So, if you are looking for a variable voltage regulator to deliver current up to 1. No availability reported, please contact our Sales office.

In our setup now, these are the values we’re going to use. Getting started with eDesignSuite. Adjustable – The Adjustable pin Adj is the pin which allows for adjustable adtasheet output. Generally, with regulators, unless they are low drop out regulators, you want the input voltage to be about 2 volts higher. They are designed to supply more than 1.

LM – V to 37 V adjustable voltage regulators – STMicroelectronics

The Resistor R1 1K and the potentiometer 10k together creates a potential datasheett at adjust pin which regulates the output pin accordingly.

If you need to calculate output voltages or which resistor R2 value you would need for a circuit, see our LM Resistor and Voltage Calculator. The input pin receives the incoming, unregulated voltage.

In other projects Wikimedia Commons. They do not and cannot create voltage on their own. The capacitors C1 and C2 are used to clean up the power line. The last pin of the LM is the output pin. Now to make it act as a variable voltage regulator we have to set variable voltages at pin 1 which can be done by using a potentiometer in the potential divider.


In use an LM commonly datasheeet a heat sink to prevent the operating temperature rising too high.

The output current is that resulting from dropping the reference voltage across the resistor. Accidenti come scotta questo transistor. Now that we’ve dealt with the input pin, we must now deal with the adjustable pin Adj.

Product is under characterization. Product is in volume production. By using this site, you agree to the Terms of Use and Privacy Policy. The LM has three pins: This is where the regulated voltage in this case, 5 volts will come out.

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 “. You can adjust it to any voltage within the range that the voltage regulator supports. Wikimedia Commons has media related to LM and Voltage regulator circuits.

When it comes to variable voltage regulation requirements LM would most likely be the first choice. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output.