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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Please, log in or register. Should I use some other voltage regulator? 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: The ESR of the output capacitor will cause loop instability if it is too high or too low.

My input is 9V, I’m using the power supply that came with the P40 demo board. Forgot Password Login or registration. What are the caps on the BS2P40 demo board?

LM2940ct 5.0 gets HOT quick.

That would work alright. Your use of Yahoo! Did you take steps to obtain caps with appropriate ESR? The LM gets hot after a few min which isn’t nice. Friday, December 05, 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.


Do you know about how much output current you have? I can’t find a schematic of it.

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

Typically, LCD displays take very ,m2940ct, but I’m not familiar with the unit you’re using. Email to a Friend. Be the first one to review this product. Only registered customers who has bought this product can write reviews. Hello, All I have is a cap between the output and ground at 22uf. The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.

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LDO – LM2940CT-5.0

Thanks, John In basicstamps yahoogroups. 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.

I believe the data sheets show a 0. The quiescent current with 1A of output current and an 50 differential of 5V is therefore only 30 mA. It is essential that the output capacitor meet these requirements, or oscillations can result. Hi John, What is the input voltage to the regulator — can you measure it?


Guess you like Empty. During line transients. 50 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. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current ,m2940ct the differential between the input volt-age and the output voltage exceeds approximately 3V.

Familiar regulator features such as short circuit and thermal overload protection are also provided. Many of the regulators require capacitance on the input and output to minimize oscillation.

LMCT-5 Datasheet

First name is required! The acceptable range of ESR plotted versus load current is shown in the graph below. Quick Links Categories Recent Discussions. Another data sheet says 0.

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