LM2940CT 5.0 PDF

Package. 0˚C ≤ TJ ≤ ˚C LMCT LMCT LMCT LMCT TO LMCS LMCS The LMCT/NOPB is a positive Voltage Regulator features the ability to source 1A of output current with a dropout voltage of typically V and a. Pin 5 and 6 need to be tied together on PCB board (5) ESD rating is based on the human body model, pF discharged through LMCT/NOPB.

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LMCT/NOPB – Texas Instruments – PCB Footprint & Symbol Download

Comments 10 Comments sorted by Date Added Votes. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. The burn your finger kind of hot. Another data sheet says 0.

LM2940ct 5.0 gets HOT quick.

Thank you for all the input. Did you take steps to obtain caps with appropriate ESR? There is another possibility Is ths just because of the load placed on it due to the lcd?

Your use of Yahoo! Be the first one to review this product. Familiar regulator features such as short circuit and thermal overload protection are also provided. Does it have a backlight? Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.

Check your caps, it might be leaky. Groups is subject to http: Hello, All I have is a cap between the output and ground at 22uf.


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Larger values of lm2940c capacitance will give improved transient response. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input volt-age and the output voltage exceeds approximately 3V.

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LMct gets HOT quick. — Parallax Forums

Guess you like Empty. Should I use some other voltage regulator?

The ESR of the output capacitor will cause loop instability if it is too high or too low. The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.

Hi John, What is the input voltage to the regulator — can you measure it? Thanks, John In basicstamps yahoogroups. Here’s a snip from p. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.

Basic Stamp List Subject: Only registered customers who has bought this product can write reviews. I l2m940ct the Terms and Coditions. Quick Links Categories Recent Discussions. Keep in mind the adapter you have may be 5.

out more than 9 volts, or may not have a very clean output, both of which will make the regulator get hot. Email to a Friend.

LDO – LM2940CT-5.0

Do you know about how much output current you have? Text in the Subject and Body of the message will be ignored.


Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. First name is required! During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating volt-age, the regulator will automatically shut down to protect both the internal circuits and the load. I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. The LM gets hot after a few min which isn’t nice. Write Your Own Review Only registered customers who has bought this product can write reviews.

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. Many of the regulators require capacitance on the input and output to minimize oscillation. I believe the data sheets show a 0. I haven’t experienced it personally, but you could have an issue there that might result in overheating.

That would work alright. Photos – easier uploading and sharing. My input is 9V, I’m using the power supply that came with the P40 demo board. The only things being powered in the circuit is the stamp and the LCD.

The acceptable range of ESR plotted versus load current is shown in the graph below. I will try it with the additional cap.