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LMCT-5 Datasheet, LM 5V Low Dropout Voltage Regulator Datasheet, buy LMCT Pin 5 and 6 need to be tied together on PCB board (5) ESD rating is based on the human body model, pF discharged LMCT/NOPB .. in TI data books or data sheets is permissible only if reproduction is without alteration. Digi-Key Part Number, LMCT/NOPB-ND. Copy LMCT/NOPB- ND. Quantity Datasheets, LMN, C Datasheet. Design Resources.

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Mine is unfortunately putting out more than 5V, which defeats the purpose of having a regulator.

Sign In or Register to comment. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. Further reading of the spec sheet yields What are the caps on the BS2P40 demo board? It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.

Thanks, John In basicstamps yahoogroups. I wonder if this will pose a problem. If you aren’t running very much current, and your Vin isn’t too high, a small clip-on heat sink can significantly reduce the regulator’s temperature.

Comments 10 Comments sorted by Date Added Votes. Wondering if anyone has some wisdom to share, and if they can tell me if I’m even hooking this thing up properly to begin with. Should I use some other voltage regulator? If I hook up another 9V in parallel to add more currentit suddenly jumps to around 7V which I would expect if it were in series, but it’s not.


Thank you for all the input.

I use these all the time, quite handy, especially with batteries since it can take a hit with the lm2940ct.50 hooked up backwards I can confirm for you that Left is Vin Middle is GND Right is output ive never tried without cap’s but yes they are for smoothing, but I dont know what effect outside of that they have my little breadboard bug that i made is rock solid 4.

Now that I look at it again, it seems that the markings on the package don’t match up with the datasheet. Voltage regulator not working as expected.

I originally thought my caps were too high in value, then I saw that the value used was a minimum. Check your caps, it might be leaky. Text in the Subject and Body of the message will be ignored.

Voltage regulator not working as expected

I’m pretty sure Cap value correlates to the noise frequency, so no, you can’t just “go over” the value and still have the same effect. I can’t find a schematic of it. Thanks for the insight, guys.

Friday, December pm2940ct-5.0, Photos – easier uploading and sharing. The cap values are related to the frequency of the noise to be filtered.

LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)

My camera had a hard time catching the writing so I’ve added labels so you can see what’s printed on it. Your use of Yahoo! Another, does your LCD has backlights? Click for larger version I found a datasheet here: Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load. Basic Stamp List Subject: The only things being powered in the circuit is the stamp and the LCD.


That would work alright. Here’s a snip from p. The key phrase is: I believe the data sheets show a 0.

Hi John, What is the input voltage to the regulator — can you measure it? Osgeld Faraday Member Posts: Did you take steps to obtain caps with appropriate ESR? Datasheet says left pin is input, but it’s labelled The burn your finger kind of hot. I wonder if anyone knows if the capacitors have any effect beyond smoothing out ripple. Quick Links Categories Recent Discussions.

Many of the regulators require capacitance on the input and output to minimize oscillation. I will try it with the additional cap.

LM2940ct 5.0 gets HOT quick.

Another data sheet says 0. Does it have a backlight? The number after the hyphen is the regulated output voltage and the input voltage must be somewhat higher. It is essential that the output capacitor meet these requirements, or oscillations can result.