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recommend dc/dc converter for LED trinket
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djacobow:
I'm designing a alkaline cell powered LED ornament / trinket to give as a gift for next year's holiday gifts. Basically, going to be some WS2812B or WS2813 LEDs on a two-layer PCB with a microcontroller and batteries.
There will be about 30 LEDs and they draw a max of 50mA each (though I probably won't ever run all of them full-out, ever). But that would be a peak current of 1.5A.
It would be nice to supply these things with 6V directly from 4xAA batteries or 4.5V from 3xAA batteries, but the datasheet says 5V is required with 5.3V max, so I need some kind of regulator. If the voltage goes much below 5V, the blue channels stops working.
So, I am looking at a buck/boost IC or maybe just using 3xAA and a boost only IC. The goal is to really suck the marrow out of the batteries.
I don't have a lot of experience working with switcher chips, but what I have has been uneventful. I mean, I've used older parts like LM2596 and using the PCB layout suggested in the datasheet, I've had no issues.
I'd like:
- hassle-free (no weird lock up or shutdown states)
- very common
- cheap
- internal power transistor(s)
- low quiescent power and/or power down
- SOIC/SOP
I'm thinking something like TPS63060 / TPS63061 as a buck/boost, or maybe LM2623 for boost only. Both are in QFN-ish package, tho. :-(
There are so many parts out there, aside from price and the required current and input/output voltage range, I never know where to start. Usually I sort by quantity in stock. I figure if there are 243,000 on hand on Digikey, it must be a popular part.
Any recommendations for favorites?
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