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LMR23610: Can the LS cycle limit be higher?

Part Number: LMR23610
Other Parts Discussed in Thread: LM43601

This hasn’t become a problem yet, but we recognize that there is a start-up limitation of the LMR23610 based on the amount of external capacitance added to the output of the circuit. We are using the LMR23610 in an application where the output is routed to an external port that can be powering external accessories, so it is possible that we will run into a case where the output cannot startup because too much capacitance has been added to the load.

 

Because of the LS current limit feature, a large (meaning only about 100uF) capacitive load on the output will trip the 64 cycle limit before the output can be charged up. This is assuming that a load is also present that will discharge the output back to zero during the 5mSec resting period. On the other hand, we do need the foldback feature which was really why I selected this part in the first place. Other buck regulators would keep running in peak current limit and overheat other parts of the circuit and/or the buck regulator itself.

 

I am happy with the way the part works, I just wish that the LS cycle limit was about 4x higher. Higher current limit parts aren’t really the answer because then the circuit could be overloaded without going into current limit soon enough. Lower current parts without foldback cannot deliver enough power.

 

Any suggestions? I doubt that TI is releasing a 256 cycle limit part anytime soon.