There are a bazillion out there -- it seems like anyone who even pretends to sell analog circuit parts sells these, with a wide variety of price ranges, features, etc.
So -- who do you think is best, and why? I'm mostly looking for parts that actually work the way that the data sheet says they will, and that don't have any really bad "gotchas". If anyone has been particularly bad about supply hiccups -- mention that, too.
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NS is #1 in performance in every product line they produce.
LTC, if you can afford them. Simulation is a big factor. I've had good luck with TI, too.
On a sunny day (Thu, 17 Nov 2011 11:47:33 -0800 (PST)) it happened Fred Bloggs wrote in :
I got a bunch of LM2596-33 from ebay, used most of it already. add an inductor and diode, in-out caps, and it is good to 3 A.
150 kHz, if you add a series resistor in the sense lead you can set it to +5V out or higher too. L = 33 uH... I have used it at 200 mA too, input up to 40 V. I am happy with these. They are obtainable, high frequency, cheap, and come in a package that I can see with the naked eye.
Lowest cost will likely be the MC34063. About 20 cents in 1K. Requires a somewhat bulky ~100uH inductor and a few extra parts- all cheap in volume. Plenty of sources-- you can hardly go wrong if it meets your specifications.
Otherwise, try doing a parametric search at TI (who now own National) and Linear Technology. You can get smaller (higher switching frequency), lower losses (synchronous MOSFET rather than Schotttky) etc. etc., but there is a cost in dollars and perhaps availability.
I second that. Efficiency isn't stellar but it is sure hard to beat its advantages, price and 2nd sourcing.
And stay away from vaporware manufacturers.
[...]Tim Wescott a écrit :
Recently used several times
Dual channels CM with sync rectifier for the low voltage channel, POR, watchdog, synchronizable, over 1 amp output current, the QFN28 version is small enough with a thermal pad... And at up to 2.5MHz the inductors are small enough...
LT certainly is nice. I had a National apps engineer tell me flat out that they didn't have behavioral SPICE models of their switching controllers, and that I should just use their web tool -- which lead me to tell him flat out that National had just lost a sale (had I been doing something exactly in line with what the regulator was designed for I may have had a different answer -- but I still didn't like the attitude of "oh just use our design tools, you don't actually have to understand what our products do").
I've used the TPS5410 from TI quite a lot. The only gotcha is that they don't like ceramics at the output. So either go for tantalum or a
0.5 Ohm series resistor + ceramic. When looking for input voltages
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That's an interesting assertion, to say the least.
-- john
Just for kicks I had used Webbench on a few of my projects. Every single one of them came back as impossible to build. Yet oodles of them have come out of various production facilities over the years :-)
The Simple switchers from NS are good for 24v input. Just watch for spikes as that will take out the input protection diode. Not may others go to 24v.
Cheers
You're out of your mind. The late lamented National made the noisiest op amp in every single class, and never got over the notion that 1 mV was a good enough offset spec, or that 400 ns was a fast settling time.
Cheers
Phil Hobbs
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That's just their ultra conservative specification system.
You're out of your mind again. NS made the noisiest op amps on the planet. I was always a National fan, having learned a lot of circuit design from their app notes when I was in grade school back in the '70s, but that didn't blind me to their faults. (I still have a dozen or so LH0063 "Damn fast buffer amplifiers" in my drawer. Best data sheet _ever_.)
Cheers
Phil Hobbs
Spehro came up with this one. It's apropriate...
This is trivial. Either one would work.
ST is inexpensive and dull, LT is the nice but expensive, MAXIM is good except for that is from MAXIM, the others are somewhere in between.
What planet are you from?
If a regulator has ENABLE or SHUTDOWN pin, check the voltage range for this pin. Some are rated to Vin, the others to Vout or +5V or such. Over/under voltage causes weird effects.
If you need to synchronize the regulator to external clock, this is special.
Super efficient, minimum dropout, super low EMI or minimum questient current is special, too.
Vladimir Vassilevsky DSP and Mixed Signal Design Consultant
If you are after low phase noise (and methinks you are), then some of their CLC-family CFB Opamps are hard to beat.
And they have really nice _fast_ ADCs.
73, Gerhard
Indeed. 12-bit 3.2GSPS (interleaved mode). (with 100kRad version available)
Best regards, Spehro Pefhany
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I second that.
On a project that needed to finish quickly it was the easy path.
We used the National LM2267x and KM267x simple switchers. They should be called trouble switchers. Designed it according to the recommendations, and they would overshoot at startup, overshoot at shutdown too. At a certain input voltage the controller just lost control of the FET and a big blurp.
I am never going to use national switcher parts again...
Regards
Klaus
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