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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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Tom Wilson 68 7.

However, I have found that higher-frequency fluctuations in voltage are not properly regulated by the LM, causing intermittent brown-out of the MCU. Would something like this work? As, if anything, your ESR may be too high it seems I’d try another cap in parallel. KevinWhite, the 5V net label represents the lowest measured output from the rectifier circuit. Anything with that rating or dataeheet is fine.

Now my confusion starts with ESR and capacitor type Because they don’t list ESR on data sheets or at least the ones I’m looking at. I live in Lincoln. I was reading it on my break and was in a hurry.

Lmm2940 read the data sheet for the LM and understand Daatasheet need two capacitors one on the input and one on the output. I have used a ground-plane in my PCB design. I hope you know that 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. 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 datashee website is subject to these policies.


CuF is an SMD tant: Sign up or log in Sign up using Google. Have you taken their compulsory advice re the output capacitor? Your oscillations are at 18 Mhz where the ESR is hopefully adtasheet low. For reference, this is the LM datasheet. Sign up using Facebook. Tying down what manufacturers really mean can be a challenge.

Whether the or Hz ESR is relevant is tbd BUT as you have a 2 x mains input dayasheet that the regulator is dealing with this may be the instability trigger.

National Semiconductor

In second case the OKI is highly suggested. If you look at page 18 in its datasheet the ESR for the uF, 6. The average datasheey at the input is around 6.

The capacitor you linked to is 22pf, which is only one millionth of the specified value. Sign up using Email and Password. If not then what am I looking for exactly. This chip predates big cheap ceramic caps, I llm2940. Any advice or pointers will be much appreciated! Is your automotive environment 12V or 24V? JohnLincoln God Member Posts: Thanks for your time.


Russell Datashet k 9 What is the input voltage?

Dtasheet this is really what they intend is unknown. This capacitor must be rated over the same operating temperature range as the regulator and 2 the ESR is critical – see curve. Post as a guest Name. If the schematics is right, your input voltage is too low, the LDR needs some headroom to regulate how much depends on your actual load.

LM Datasheet(PDF) – List of Unclassifed Manufacturers

Less crucial is a picture of the output voltage waveform especially as we don’t know what bad probing techniques you may have used. Also why do you have 18MHz 1. As a general rule, the higher the voltage rating the larger the size so a 0.

With such low power involved you can go with the linear regulator, you shouldn’t have any problem. They need to be rated above my voltages also.

And also separately a resistor in series for belts and braces coverage: Could that contribute to the oscillation? Or offer an alternative regulator that is more linear at high frequency As suggested in this answer?

I just thought the OKIsr might be a little overkill in terms of cost for other similar stuff down the road.