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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Output capacitor ESR required for stability: The characteristics of aluminum wet electrolytic capacitors of the correct capacitance and voltage rating are well suited to the output capacitor’s role.
Using a tantalum capacitor as the input capacitor invites capacitor death at any time if the input power rail can have voltage spikes on it from any source. XX these two digits of the type number indicate voltage.
This family of fixed voltage regulators are monolithic integrated circuits. I wasn’t criticising you – sorry if it seemed that way. Look at the output with an oscilloscope and you may see an eg kHz semi sine wave of ‘s of mV to some Volts of amplitude on a nominal 5VDC output.
I’m ratasheet a little datasehet about why they specifically call out tantalum so much, but your answer makes clear that I can overlook this. In this case the peers are scattered all over the internet. The 10 uF, 10V is about half the allowed ESr – perhaps a bit close for comfort across lifetime. 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.
Matt, having read a little more about it, ESR certainly seems likely to be the reason. To provide loop stability they require an output capacitor which has both capacitance daasheet ESR in selected ranges. Any datashret of the output capacitance will merely improve the loop stability and transient response. Any capacitor which meets these specifications is suitable. Still, I’d like to know for sure. Could it be that tantalums typically have a higher ESR than electrolytic? Most capacitors don’t behave like a single cap in series with datasgeet single resistor, but rather as a huge network of interconnected resistors and capacitors.
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 Why are they so specific about using tantalum capacitors? The input voltage must remain.
LM datasheet, Pinout ,application circuits Series 3-Terminal Positive Regulators
An important notice at the end of this data sheet addresses availability, warranty, changes, use in safetycritical applications, intellectual property matters. Lm datasheet, lm pdf, lm data sheet, lm manual, lm pdf, lk340, datenblatt, electronics lm, alldatasheet, free, datasheet, datasheets, datzsheet sheet. Mc, mca, lm, lma series motorola analog ic device data 3 electrical characteristics vin darasheet v, io ma, tj tlow to thigh note 1, unless otherwise noted.
This series of devices can be used with a series—pass transistor to boost output current capability at the nominal output voltage. The input capacitor is not overly critical when the regulator is fed from an already well decoupled system bus. Would the output oscillate with high ripple or be undefined or what exactly would happen? Tantalums were specified because Electrolytic can have their ESR increase up to 30x on very low temps. Required ESR is stated as. Solid tantalum capacitors have a more stable ESR over temperature, but are more expensive than aluminum electrolytics.
Only slightly more complex – good Sueful – stack exchange. Only slightly more complex – good Sueful – stack exchange Useful Lots of related pictures 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? Peter Mortensen 1, 3 14 This is l3m40 extremely wide and unusual requirement.
I understand the need for the capacitors, but it’s not clear to me why these should specifically be tantalum. The lmh and lmk may also be procured as jan devices on slash sheet jm Tantalum capacitors are completely unnecessary in this application.
MattYoung Actually yes, it is. The following is what you may datwsheet in typical circumstances – actual results vary widely but this is a guide. Depending on feedback parameters you might get low frequency oscillation, slow enough to see as variations on a “DC” meter and you might get more like MHz signals.
Spikes above rated value will produce a literally flaming melt down. The LM datasheet provides clear guidance on the essential and desirable characteristics of the input and output capacitors. Although no output capacitor is needed for stability, it does help transient response.