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.

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Complete Technical Details can be found at the LM datasheet given at the end of this page.

LM Datasheet, LM PDF Schematic, Manual, Equivalent – Fairchild Semiconductor

When it comes to variable voltage regulation requirements LM would most likely be the first choice. Apart from using it as a variable voltage regulator, it can also be used as a fixed voltage regulator, current limiter, Battery datssheet, AC voltage regulator and even as an adjustable current regulator.


One notable drawback of this IC is that it has a voltage drop of about 2. So, if you are looking for a variable voltage regulator to deliver current up to 1. LM is a 3-terminal regulator IC and it is very simple to use.

It has many application circuits in its datasheet, but this IC is dattasheet for being used as a variable voltage regulator. 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.

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. The below circuit is designed to take 12V you can supply up to 24V as input and regulate it from 1. The Resistor R1 1K and the potentiometer 10k together creates a potential difference at adjust pin which regulates the output pin accordingly.


The formulae to calculate the Output voltage based on the value of resistors is. And the simulation shows 7. Datassheet can vary the output voltage by simply varying the potentiometer. In our circuit, a motor is connected as a load which consumes around mA you can connect any load up to 1.

The same formulae can also be used datashet calculate the value of resistor for you required output voltage. One easy way to do this is to use this online calculator to randomly substitute the value of resistors you have and check which output voltage you will get. Submitted by webmaster on 27 December Adjustable 3-terminal positive voltage regulator Output voltage can be set to range from 1.

How to use LM TL — Programmable Reference Voltage.