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Author Topic: Favorite 3.3V regulator  (Read 907 times)
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With more and more stuff to connect to Arduino at 3.3V, tapping off of the USB is getting less handy.

What is everyone's favorite, bullet proof, probably LDO, 3.3V regulator?


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I've made notes on using the TI UCC283-5 and UCC283-3 low drop out (LDO) voltage regulators.

I used the UCC283-3 with success on my Netduino project.

--Phil.

Disclosure: The ones I used were from TI's sample programme.
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I don't have a favorite, haven't used them enough, but I have ran into several.

If I did have a favorite, it'd probably be a 7833, as it's a drop-in replacement for the ubiquitous 7805.  Not LDO, though, and not exactly common.

I have used a 2985 (or was that 2981?) 3.3V fixed.  It's a bit weak at 150mA (at least the SOT-23-5 version I used was).

I received some LP2950s in TO-92 a couple of weeks ago, but haven't used any yet.  LDO, but only 100mA.

The LM2940 is a nice LDO replacement that's pin-compatible with the 78xx, available in 5v and 3.3v fixed versions, among others.

Of course, there are always the adjustable regulators; I've got a couple of LM317's in service at 3.3V.

-j

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I like using Microchip's MCP1700-33 LDO regulators when working with the Arduino. I use the TO-92 part so it's small with a max of 250mA. It works well for powering most of the 3.3v sensors and parts I've used like XBees and other radio modules. It has a max input of 6.5V though, so I only connect it to 5V on the Arduino (not "Vin").

When I need more current, I use the LD1117v33. It's a LDO TO-220 regulator.
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