Updated : Oct 13, 2019 in Literature


LM–XX. Input. Cin*. µF. CO**. Output. 1. MOTOROLA ANALOG IC DEVICE DATA. Three-Terminal Positive. Fixed Voltage Regulators. This family of fixed. the LM is available in the SOT package, as well .. †The specifications for the LMH/ devices are not contained in this datasheet. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of their respective.

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They say in the LM datasheet. Solid tantalum capacitors have a more stable ESR over temperature, but are more expensive than aluminum electrolytics. Output capacitor ESR required for stability: Why does the LM data sheet specifically specify tantalum capacitors? I meant to comment on Jon’s query why they would spec tantalum given the apparent lack of need for it. Smoke, flame, noise, bad smell and explosion all optional – I have seen one tantalum cap do all of these in turn: What would be an example of an unstable regulator?

The dagasheet regulator can work to reduce this ripple, but it is nice to not have your filter capacitor adding to the problem you want it to fix. The input voltage must remain typically 1. ESR is a “Goldilocks requirement”: The lmh and lmk may also be procured as jan devices on slash sheet jm It is assumed from here on that lifetime has been properly designed for and is not an issue. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms satasheet serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

These three—terminal regulators employ internal current limiting, thermal shutdown, datasheeet safe—area compensation. Also, how exactly does the ESR come into play here? However, the designer dwtasheet ensure that the Lk340 will stay inside the limits shown over the entire operating temperature range for the design. Would the output oscillate with high ripple or be undefined or what exactly would happen? Depending on feedback parameters you might get low frequency oscillation, slow enough to see as variations on a “DC” meter and satasheet might get more like MHz signals.


BUT anything can happen. Lm datasheet, lm pdf, lm data sheet, lm manual, lm pdf, lm, datenblatt, electronics lm, alldatasheet, free, datasheet, datasheets, data sheet.

LM Motorola Three-Terminal Positive Voltage Regulators ChipFind Datasheet Archive |

You can look at stability from the point of view of eg Nyquist stability criteria or related no poles on right half plane and all poles inside unit circle or This is an extremely wide and unusual requirement.

Only slightly more complex – good Sueful – stack exchange. In this case the peers are scattered all over the internet. Symbol Min Typ Max.


And one final note, did you refer to the ripple voltage on the cap being large even for small currents as an inherent issue due to the small size?

A tantalum capacitor is not required to meet this specification.

The following is what you may see in typical circumstances – actual results vary widely but this is a guide. The 10 uF, 10V is about half the allowed ESr – perhaps a bit close for comfort across lifetime. The km340 capacitor is more crucial. Darasheet depends on what you are powering but it’s not usually all that critical unless ripple and transient response are especially critical for you. The input capacitor is a typical reservoir capacitor, its value is relatively non critical.

datwsheet An integrated circuit or monolithic integrated circuit also referred to as an ic, a chip, or a microchip is a set of electronic circuits on one small plate chip of semiconductor material, normally silicon. Heatsink surface is connected to Pin 2.


It is essential that the output capacitor meet these requirements, or oscillations can result. Because if someone like you finds something wrong you are able to correct it.

The second group are what would be used with Cadj bypassed and could be used anyway – ESRs are far away from limits in both directions.

Thank you for the extremely detailed and helpful answer.

PDF LM340 Datasheet ( Hoja de datos )

The input capacitor is not overly critical when the regulator is fed from an already well decoupled system bus. I’m still a little puzzled about why they specifically call out tantalum so much, but your answer makes clear that I can overlook this.

ESR of ceramics is apparently very low, whereas for electrolytics, it increases over time. It’s clear that they do not expect high ripple currents and that the capacitor’s role is primarily related to loop stability than to noise control per se.

If this is indeed the reason, electrolytics should be fine for now – I’m trying something out, not making 10, of them. Russell McMahon – Huh? If needed, use a 0. Under the diagram on the front page they note “Required if the regulator is located far from the power supply filter” – to which you could add “or another well decoupled portion of the supply”.

If needed, use 0. Lm three terminal positive fixed voltage regulators components datasheet pdf data sheet free from datasheet data sheet search for integrated circuits ic, semiconductors and other electronic components such as resistors, capacitors, transistors and diodes.

Lm datasheet, lm pdf, pinouts, circuit texas. If I’ve missed something or made a significantly incorrect technical assertion then by all means say. What exactly would happen? Any capacitor which meets these specifications is suitable.