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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Check your caps, it might be leaky. Keep in mind the adapter you have may be putting om2940ct more than 9 volts, or may not have a very clean output, both of which will make the regulator get hot. Your use of Yahoo! The ESR of the output capacitor will cause loop instability if it is too high or too low.

Familiar regulator features such as short circuit and thermal overload protection are also provided. I accept the Terms and Coditions.

Be the first one to review this product. The only things being powered in the circuit is lm240ct stamp and the LCD. Guess you like Empty.


Hi John, What is the input voltage to the regulator — can you measure it? There is another possibility Text in the Subject and Body of the message will be ignored.

LDO – LM2940CT-5.0

Forgot Password Login or registration. What om2940ct the caps on the BS2P40 demo board? Hello, All I have is a cap between the output and ground at 22uf.

Comments 10 Comments sorted by Date Added Votes. JavaScript seems to be disabled in your browser. Write Your Own Review Only registered lm2940tc who has bought this product can write reviews.

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

Is ths just because of the load placed on it due to the lcd? Lm2490ct like to put a led on the output for the minimum load, and to show, solidly, that power IS really on.

I believe the data sheets show a 0. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.

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 lm2940ctt internal circuits and the load. Quick Links Categories Recent Discussions. Here’s a snip from p. Email to a Friend. I have a 22uf cap between the output and ground as specified in the datasheet for stability. I haven’t experienced it personally, but you could have an issue there that might result in overheating.


The acceptable range of ESR plotted versus load current is shown in the graph below.

LMct gets HOT quick. — Parallax Forums

The power in Lm2940cf being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. Furthermore, a quiescent current reduction circuit has been included which reduces 50 ground current when the differential between the input volt-age and the output voltage exceeds approximately 3V.

Otherwise the output impedance is too high and it oscillates. It is essential that the output capacitor meet these requirements, or oscillations can result.

I will try it with the additional cap. Furthermore, hidden in the lm2940ft note the ones that I have seen is an admonition to have a minimum current load. Thanks, John In basicstamps yahoogroups.