Other Parts Discussed in Thread: LMR16010, , LMR33620, LMR33630
Hello,
short simple question, because I am not capable of seeing it myself:
I have to choose a buck regulator, the one I started with LMR16010, for 0... 1A of load current. Turned out that this little IC only starts working properly with about 200 mA or higher, cannot remember right, right now.
I am using it mainly for minor currents of 10mA to 100mA, so it is basically working in sleep mode, which means a huge ripple on the output voltage, huge in the meaning 3% of 3,3V, which is about 100mV, of course this could work too, but now I did get myself a recommendation for this pretty part: LMR23630, because it is supposed to work in a rather nicley fashion, by forcing a PWM on the switching internally, so there should not be any efficiency enhancement by going into sleep mode, which is perfectly fine for me, I want low ripple and not maximum efficiency.
Now i keep on stumbling over other new? devices like the LMR33620 ( its pretty the same as LMR23620, but better EMI? ) but sadly has a whole other Pinout in the SOIC8, how come?
I would appreciate it, if someone uses those party and can name the main differences, since everything seems pretty the same, also those parts come in different output load current, that is for example 1A and 3A,
ONLY the 3A version has the forced PWM, is that right? At least I only can find the forced version named in the datasheet LMR23630AF ( F = forced ) the other ones do not have such naming, so can I assume that the other devices work in different mannors?
And to put some measurment on the ripple at the end, about 1 to 2A load current gives about 20mVripple @ 400kHz on my oscilloscope measurments, which seems pretty insane to me, last thing I measured was the LMR16010 on 1A output current, it still gives kind of >1% output Ripple, on 3V for example around 80mV, of course those are coarse measurments, not precisly taken, just on the oscilloscope.
But to say, on the LMR16010 i had only about 8uF output cap, the LMR23630 Eval Board has MLCC 47uF parallel to 150uF alu polymer, next plan is to solder them off, to have check on the ripple in comparisson to the LMR16010.
Well, thanks for reading and maybe thanks for Your incoming advice :)
