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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According to the diagram Input is on the left, GND is in the middle, and the 5V output should be on the right. Datasheet says left pin is input, but it’s labelled Thanks for vatasheet insight, guys.
Many of the regulators require capacitance on the input and output to minimize oscillation.
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Hi John, What is the input voltage to the regulator — can you measure it? I wonder if this dataaheet pose a problem. The key phrase is: If you look at the diagram on the first page you will see some asterisks next to the capacitors. 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.
The number lm2940ct.50 the hyphen is the regulated output voltage and the input voltage must be somewhat higher.
LM2940ct 5.0 gets HOT quick.
Does it have a backlight? I haven’t experienced it personally, but you could have an issue there l2940ct-5.0 might result in overheating. Otherwise the output impedance is too high and it oscillates. I like to put a led on the output for the minimum load, and lm2940ch-5.0 show, solidly, that power IS really on.
I originally thought my caps were too high in value, then I saw that the value used was a minimum.
Can you let us know what is printed on the third line? Even linear regulators are datasheeg devices, which generate some noise that must be filtered.
Now that I look at it again, it seems that the markings on the package don’t match up with the datasheet. Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.
LMCT Datasheet(PDF) – TI store
Osgeld Faraday Member Posts: It’s a 3-pin TO package. Click for larger version I found a datasheet here: Quick Links Categories Recent Discussions.
Voltage regulator not working as expected. Did you take steps to obtain caps with appropriate ESR?
LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)
The actual values of the caps matter, too. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Another data sheet says 0. You probably still need the capacitor. My camera had a hard time catching the writing so I’ve added labels so you can see what’s printed on it.
Basic Stamp List Subject: I went digging through my dad’s old junk box and found a 16V, uF electrolytic cap. Another, does your LCD has backlights? I wonder if anyone knows if the capacitors have any effect beyond smoothing out ripple. Your use of Yahoo! Here’s a snip from p.
My input is 9V, I’m using the power supply that came with the P40 demo board. 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. Text in the Subject and Body of the message will be ignored. What are the caps on the BS2P40 demo board? The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.
I have a 22uf cap between the output and ground as specified in the datasheet for stability.