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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I can’t find a schematic of it. Thank you for all the input.

LMct gets HOT quick. — Parallax Forums

It’s interesting that mine gets this hot when I have seen 5.0 using the same setup, with a 10uf cap even. JavaScript seems to be disabled in your browser.

Hello, All I have is a cap between the output and ground at 22uf. I have a 22uf cap between the km2940ct and ground as specified in the datasheet for stability. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Forgot Password Login or registration.

Friday, December 05, 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.


The acceptable range of ESR plotted versus load current is shown in the graph below. Photos – easier uploading and sharing. What are the caps on the BS2P40 demo board? Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.

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

I haven’t experienced it personally, but you could have an issue there that might result in overheating. Larger values of output capacitance will give improved transient response. That would work alright. You must have JavaScript ln2940ct in your browser to utilize the functionality of this website.

Another, does your LCD has backlights? Your use of Yahoo!

LDO – LM2940CT-5.0

I believe the data sheets show a 0. Thanks, John In basicstamps yahoogroups. The ESR of the output capacitor will cause loop instability if it is too high or too low. I accept the Terms and Coditions. It ln2940ct essential that the output capacitor meet these requirements, or oscillations can result.

Text in the Subject and Body of the message will be ignored. There is another possibility Guess you like Empty. Keep in mind the adapter you have may be putting out more than 9 volts, or may not have a very clean output, both of which will make the regulator get hot. Only registered customers who has bought this product can write reviews.


Email to a Friend. Should I use some other voltage regulator? Groups is subject to http: Do you know about how much output current you have? Did you take steps to obtain caps with appropriate ESR? Be the first one to review this product. Here’s a snip from p.

LM2940ct 5.0 gets HOT quick.

Familiar regulator features such as short circuit and thermal overload protection are also provided. The LM gets hot lm2940vt a few min which isn’t nice. Is ths just because of the load placed on it due to the lcd? Another data sheet says 0.

Hi John, What is the input voltage to the regulator — can you measure it? Sign In or Register to comment.