Why does the LT6220 datasheet not boast of its ability to drive high capacitance?

Page 1 of the OPA197 opamp datasheet boasts that the OPA197 has “High
Capacitive Load Drive Capability: 1nF"
The LT6220 opamp datasheet makes no such boast.
However, the LT6220 opamp has a better ability to drive high output capacitance than the OPA197 opamp. This is seen on page 12 (top right graph) of the LT6220 datasheet in comparison to that seen on page 23 (Fig 48) of the OPA197 opamp datasheet.
The LT6220 suffers less overshoot when driving the same amount of high output capacitance…so why does the LT6220 datasheet not boast so much of its ability to effectively drive high output capacitance?

LT6220 datasheet:-
http://cds.linear.com/docs/en/datasheet/622012fc.pdf

OPA197 datasheet:-
http://www.ti.com/lit/ds/symlink/opa197.pdf

Hi treez,

haven't you noticed that Linear and TI have a different style in their datasheets... Linear seem quite matter-of-fact and understated whereas TI softly highlight the virtues of their devices in the detailed descriptions, all the same both seem very methodical and keen to include the calculations the user needs to deal with and the hazards they may encounter. TI occasionally have datasheets that end on less positive aspects, like PD with no comment at the very end, I assume that's deliberate for the user to ponder such an abrupt cliffhanger ending. That's the general impression I get, like Microchip can be quite overview-oriented but in surprising detail in their app notes, whereas more analog oriented can have a more specific approach. Maybe?

thanks, so you agree the LT6220 actually has better ability to drive large capacitive loads than the OPA197?

Frankly, I don't know as after scrutinisng the relevant graphs I still don't undestand either of them... So the LT6220 has 0% overshoot at 10,000pF, but 35% at 1,000?, while the TI graphs end at 2,000, so it's hard to compare? If that's a transient curve, than I suspect the TI device has less overshoot. Rather than talk rubbish, I'll shut up...

thanks, i was also trying to work out the thing about 0% overshoot for 10nF load with the LT6220.

I don't agree with the assumptions in post #1.

- OPA197 can drive larger capacitive load in large signal operation, guaranteed output short circuit current is 65 mA versus 30 mA for LT6220
- OPA197 has specifications for capacitive load without series ("isolation") resistor, LT6220 is only specified with minimum series resistor of 10 ohms.

LT6220 has however considerably larger GBW and might outcompete OPA197 due to other parameters.

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To analyze the behavior with a resistively isolated load capacitance, you need to consider both open loop output impedance and closed loop bandwidth. Different OPs can behave quite different in this regard.

What's your application? Driving a capacitive load dynamically or statically? Can you accept an isolation resistor?

Thanks, application is an external error amplifier in an smps with a crossover frequency of around 30khz.

Why should it drive large capacitive load?

we may want to use a lower crossover frequency and have larger value compensation capacitor which the opamp will need to be able to slew quick enough