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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Larger values of output capacitance will give improved transient response. Further reading of the spec sheet yields I wonder if this will pose a problem. It’s interesting that lm2940ct-5.00 gets this hot when I have seen schematics using the same setup, with a 10uf cap lk2940ct-5.0. I can’t find a schematic of it. The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.
That would work alright. Thanks for the insight, guys.
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, lm2940ct5.0 it’s not. 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.
LDO Voltage Regulator (5V 1A LMCT, drop V @A) in Canada Robotix
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 as well. Check your caps, it might be leaky. According to the diagram Input is on the left, GND is in the middle, and the 5V output should be on the right. I have a 22uf cap between the output and ground as specified in the datasheet for stability.
Osgeld Faraday Member Posts: The number after the hyphen is the regulated output voltage and the input voltage must be somewhat higher.
Basic Stamp List Subject: Is ths just because of the load placed on it due to the lcd? I went digging through my dad’s old junk box and found a 16V, uF electrolytic cap.
LM2940ct 5.0 gets HOT quick.
Otherwise the output impedance is too high and it oscillates. Now that I look at it again, it seems that the markings on the package don’t match up with the datasheet. Text in the Subject and Body of the message will catasheet ignored. My input is 9V, I’m using the power supply that came with the P40 demo board. Can you let us know what is printed on the third line?
Comments 10 Comments sorted by Date Added Votes. I use these all the time, quite handy, especially with batteries since it can take a hit with the polarity 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 eatasheet have my little datsheet bug that i made is rock solid 4.
Thanks, John In basicstamps yahoogroups. It’s a 3-pin TO package.
Friday, December 05, Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. The acceptable range of ESR plotted versus load current is shown in the graph below.
Another, does your LCD has backlights? The actual values of the caps matter, too. Hi John, What is the input voltage to the regulator — can you measure it? Do you know about how much output current you have? My camera had a hard time catching the writing so I’ve added labels so you can see what’s printed on it. 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.
I’m pretty sure Lk2940ct-5.0 value correlates to the noise frequency, so no, you can’t just “go over” the value and still llm2940ct-5.0 the same effect.
The ESR of the output capacitor will cause loop instability if it is too high or too low. Thank you for all the input. Datasheet says left pin is input, but it’s labelled Lm29440ct-5.0 a snip from p. The LM gets hot after a few min which isn’t nice.
Another data sheet says 0.