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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I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. The circuit I’m building works fine with a 5V regulated supply one you plug into the wallbut I’d like to expand the design to work off of batteries datashfet well. Even linear regulators are switching devices, which generate some noise that must be filtered. That would work alright. Many of the regulators require capacitance on the input and output to lm2940xt-5.0 oscillation.

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. Thanks, John In basicstamps yahoogroups.

LMct gets HOT quick. — Parallax Forums

Do you know about how much output current you have? Basic Stamp List Subject: There is another possibility I have datasyeet 22uf cap between the output and ground as specified in the datasheet for stability. My camera had a hard time catching the writing so I’ve added labels so you can see what’s printed on it. I wonder if this will pose a problem. Can you let us know what is printed on the third line?


Groups is subject to http: Otherwise the output impedance is too high and it oscillates. Hello, All I have is a cap between the output and ground at 22uf. Mine is unfortunately putting out more than 5V, which defeats the purpose of having a regulator.

Thanks for the insight, guys.

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

I can’t find a schematic of it. 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.

The only things being powered in the circuit is the stamp and the LCD.

It is essential datashheet the output capacitor meet these requirements, or oscillations can result. Sign In or Register to comment. The output capacitor is required to ‘maintain stability’ which probably means to keep it from oscillating, which in turn could cause the strange output readings you are getting.

I originally thought my caps were too high in value, then I saw that the value used was a minimum. How’s that for redundancy?

Another data sheet says 0. My input is 9V, I’m using the power supply that came with the P40 demo board.

Hi John, What is the input voltage to the regulator — can you measure it? Text in the Subject and Body of the message will be ignored. The number after the hyphen is the regulated output voltage and the input voltage must be somewhat higher. It’s a 3-pin TO package. I believe the data sheets show a 0. Click for larger version I found a datasheet here: Did you take steps to obtain caps with appropriate ESR?


The battery is a little over 9V. Osgeld Faraday Member Posts: The wiring diagrams in the datasheet include capacitors, but I assume that these are for smoothing out ripple, and would have no effect on this massive increase in voltage I’m seeing.

Further reading of the spec sheet yields Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. The LM gets hot after a few min which isn’t nice. The key phrase is: The actual values of the caps matter, too.

The burn your finger kind of hot. Does it have a backlight? OK – I see the third line info now! If I hook up another 9V in parallel to add lm940ct-5.0 currentit suddenly jumps to around 7V which I would expect if it were in series, but it’s not. Photos – easier uploading and sharing.

Voltage regulator not working as expected. I went digging through my dad’s old junk box and found a 16V, uF electrolytic cap.