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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This creates adjustable voltages.

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LM3171 Datasheet

So therefore, since we want 5 volts as output, we will feed into this regulator 7 volts. The last pin of the LM is the output pin. The formulae to calculate the Output voltage based on the value of resistors is. In our setup now, these are the values we’re going to use. Archived from the original PDF on 31 March Media Subscription Media Contacts.

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LM Voltage Regulator Pinout, Features, Equivalent & Datasheet

This is the advantage of adjustable voltage regulators. How the adjustment pin is connected determines the output voltage as follows. Datasheeg is under characterization. We’re going to put 12 volts into the voltage regulator and regulate it down to 5V. Product is in volume production. However, the 78xx device’s quiescent current is substantially higher and less stable.

If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. When it comes to variable voltage regulation requirements LM would most likely be the first choice.

Therefore, V IN must be greater than 5 volts. TL — Programmable Reference Voltage.

Support Center Complete list and gateway to support services and resource pools. This is the pin which, again, receives incoming voltage which the chip will then regulate down. 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.

We do this by changing the value of the resistor connected to the Adj pin of the voltage regulator. C2 is needed if the device is far from any filter capacitors. Archived from the dataeheet PDF on 18 April Who We Are Management. To adjust output, we swap out resistor R2 value l3171 a different resistance. The Resistor R1 1K and the potentiometer 10k together creates a potential difference at adjust pin which regulates the output pin accordingly.


And the simulation shows 7.

For example, the input voltage pin can be fed 12V, which the regulator will regulate down to 10V. Since we want 5 volts to be output, we must calculate which value of R2 will yield an output of 5 volts. You will discover it’s very close to 5 volts.

V IN – V IN is the pin which receives the incoming voltage which is to be regulated down to a specified voltage. Menu Products Explore our product portfolio. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. Product is in design stage Target:

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