Electronics > Projects, Designs, and Technical Stuff
Suggest your favourite buck switching regulator, 12v-5v in 3v3 1v2 out
chickenHeadKnob:
Help me please. I am suffering option paralysis. Way too many choices.
Which is the switching regulator do you like to use for board level down conversion. I want to supply an mcu and spartan 6 (xc6lx9) FPGA. Price is not the biggest concern. Should supply up to 1.5 amps with low heat production. I doubt I will need that much current but would like to have some headroom. Regulators which can supply 1 amp or more are still in consideration. Does not need to be dual output! That is I don't mind separate chip for each fixed output. Minimum external components a plus. Low noise also a plus. I don't think it matters if the regulator generates a lot of hash because of cycle skipping at low output. I prefer tsop and so packaging over QFN. Don't want any BGA types.
zenerbjt:
linear.com sync bucks sound like your best...they have the free LTspice sim with them....(its now owned by analog.com)
poorchava:
I routinely use TI parts. They have a nice online tool that can usually give you a good starting point. Pricing is usually reasonable too.
I tend to stay away from LT parts of any kind, as they quite often have various quirks (like an SPI with an active-high CS, and polarity mode 1.0 or 0.1, config being latched during power up based on voltage at a pin, which later has some completely different function, etc)
thinkfat:
LMR14030SDDAR. Not a sync buck so you need an external diode, reasonably high switching frequency for small components (I've used a XAL5030 inductor with good results). Can be integrated on a 2 layer PCB np. SOIC-8 with power pad, maybe a bit larger than what you'd like.
exmadscientist:
Sync bucks are really nice because a big chunk of the hot loop ends up inside the chip. They're cheap enough these days that I rarely use anything else, at least for low voltage.
I also really like TI's "HotRod" packages, QFNs with bars under the chip. They're usually marked "VQFN-HR" or something similar in TI's search tools. The little bar-shaped pad often lets you make a really good layout with excellent performance. The downside is that you have to rework a tougher-than-usual QFN when something goes wrong. Something like TPS62148 would be my preference.
If I'm not selling you on those little beasties, take a look at LMR33620 and family. It's a big family with many parts available in either SOIC or fancy QFN. I haven't used every variant, but the ones I have used have been solid for me.
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