The LM/LMC positive voltage regulator features the ability to source 1A of output current with a dropout volt- age of typically V and a maximum of. The LM LMC positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0 5V and a maximum of 1V. The LM positive-voltage regulator features the Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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This chip predates big cheap ceramic caps, I think. Home Questions Tags Users Unanswered.

National Semiconductor

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Schematic of the regulation circuit. In second case the OKI is highly suggested. I have used datashewt LM in a number of designs with no problem using tantalum input and output caps.

The capacitor you linked to is 22pf, which is only one millionth of the specified value. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is datashewt to these policies. Would something like this work? Your oscillations are at 18 Mhz where the ESR is hopefully very low. However, I have found that higher-frequency fluctuations in voltage are not properly regulated by the LM, causing intermittent brown-out of the MCU.

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NB – in the pdf you cite they say: I live in Lincoln. I was reading it on my break and was in a hurry. This capacitor must be rated over the same operating temperature datasgeet as the regulator and. KevinWhite, the 5V net label represents the lowest measured output from the rectifier circuit. Anything with that rating or higher is fine.

Please see updated question with attached schematic. Because they don’t list ESR on data sheets or at least the ones I’m looking at. I hope you know ml2940 the 2 are not properly the same parts, both are 5V regulators but the OKI is switching power supply, while the LM is linear one, the main difference for your use is heat dissipated. My note started from the fact that both regulator are rated at 24V input and capable of 1A, and you didn’t initially specify yours needs.

Alas the data on minimum ESR is rather sketchy fatasheet for “C” case for exampleso you have to guesstimate from just these two graphs or get an ESR meter and measure datasheft, or even just with your scope and a function gen that can hit those MHz frequencies where you see oscillation. JohnLincoln God Member Posts: Less crucial is a picture of the output voltage waveform especially as we don’t know what bad probing techniques you may have used.

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LM Datasheet(PDF) – List of Unclassifed Manufacturers

Do you also have the input capacitor 0. With such low power involved you can go with the linear regulator, you shouldn’t have any problem. Dataaheet reference, this is the LM datasheet.

The datasheet specifies the drop-out voltage as 0. May be increased without bound to maintain regulation during transients. Eatasheet is an SMD tant: Hi Russel, thanks for the feedback.

What about with a simple resistor ml2940 at the same current, does it have the same problem? Is your automotive environment 12V or 24V? Tying down what manufacturers really mean can be a challenge.

You have 5V on the schematic which can’t work. Could that contribute to the oscillation? I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road. Tom Wilson 68 7.