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.

Author: Tekasa Brashicage
Country: Puerto Rico
Language: English (Spanish)
Genre: History
Published (Last): 24 July 2008
Pages: 282
PDF File Size: 16.43 Mb
ePub File Size: 8.20 Mb
ISBN: 930-6-32934-681-4
Downloads: 68793
Price: Free* [*Free Regsitration Required]
Uploader: Tygogore

A common ground is required between the input and. Russell McMahon – Huh? BUT anything can happen.

LMT-5 Datasheet

What exactly would happen? 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. Why does the LM data sheet specifically specify tantalum capacitors? It is possible to connect a small tantalum dtasheet parallel to a large electrolytic if cost is an issue. Still, I’d like to know for sure.

National Semiconductor – datasheet pdf

The first group are capacitors that might be used in practice in this application at the low end of the capacitance range. Electolytics have poor high frequency performance compared to tantalums.

I wasn’t criticising you dataeheet sorry if it seemed that way. Tantalum serves no technical purpose here. Tantalum offers OK cost datazheet capability at capacitances from about 10 uF up.

Output capacitor Many modern low drop out high performance regulators are unconditionally unstable as supplied. MattYoung Actually yes, it is.

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. Lots of related pictures.


Series 3-Terminal Positive Regulators

MattYoung And how long do you think that edit would last? Fixed output voltage regulator required if the regulator is located far from the power supply filter. The output capacitor is “safe” against spikes in most cases.

This requirement could be met by an aluminum wet electrolytic cap or a ceramic cap. Post as a guest Name. If needed, use 0. It is assumed from here on that lifetime has been properly dstasheet for and is not an issue. Meeting these conditions is essential for stability under all load conditions. The output capacitor is more crucial. Ordering information heatsink surface connected to pin 2. Sign up or log in Sign up using Google. The output capacitor is NOT a filter capacitor in any traditional sense.

The input voltage must remain. If the net loop feedback is positive you datashewt oscillation.

This can be made much smaller than a discrete circuit made from independent. This series of devices can be used with a series—pass transistor to boost output current capability at the nominal output voltage. Output capacitance required for stability: If a uF cap behaved as a series-parallel combination containing a series combination of an ideal 0.

Threeterminal positive fixed voltage regulators this family of fixed voltage regulators are monolithic integrated circuits capable of driving loads in excess of 1.

The intuitive and the logical do not always match. 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. Symbol Min Typ Max.


I meant to comment on Jon’s query why they would spec tantalum given the apparent lack of need for it. XX these two digits of the type number indicate.

National Semiconductor

Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. Why are they so specific about using tantalum capacitors? A naive passerby like myself would expect lower series resistance to be better. MikeJ-UK 5, 11 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 subject to these policies.

An important notice at the end of this data sheet addresses availability, warranty, changes, use in safetycritical applications, intellectual property matters.

The ESR of the output capacitor should range between 0.

Absolute maximum ratings note 1 if militaryaerospace specified devices are required, please contact the national semiconductor sales office distributors for availability and specifications.

Jon Bright 2 3 9. ESR is a “Goldilocks requirement”: It’s adequate to say that the feedback from output to input does not reinforce oscillation and that a resistance that is too large or too small may lead to an overall reinforcement when considered as part of the overall system. Vn — —. Could it be that tantalums typically have a higher ESR than electrolytic? These three—terminal regulators employ internal current limiting, thermal shutdown, and safe—area compensation.

A tantalum capacitor is not required to meet this specification.