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Topic: Efficient power converter: 7,4V(2S LiPo) to 3,3V low current (10mA) (Read 463 times) previous topic - next topic

Zealot

I am looking for an efficient way to power a Microprocessor with a 2S LiPo. So this power converter should be very efficient transforming 7,4V to 3,3V with relatively low currents (~10mA).

When I look at the datasheets of power converters they often don't cover this area (~10mA).

Does that mean then don't work there at all - or are very inefficient?



LT3477



Pololu S7V8F3


JoeN

I did a little poking around on Linear's site.  They have a lot of switching regulators to look at.  This part looks like it has a better chart and shows currents in the area you are talking about.  http://www.linear.com/product/LTC1474  The LT3477 seems more aimed at higher current applications like something with a lot of LEDs.  Have you done a switching regulator before?  I've only done two so far.  Some people have said they are finicky about layouts.  Both worked for me.  The definitely require more external parts than a linear regulator, though.  Hopefully a real expert will chime in soon.


I will never ask you to do anything that I wouldn't do myself.

JoeN

This one looks even better if you are never going to exceed 20mA.

http://www.linear.com/product/LTC3632


I will never ask you to do anything that I wouldn't do myself.

Zealot

I've only done two so far.  Some people have said they are finicky about layouts.
No, I haven't. Maybe the caps are finicky? When I look at some boards they use elcos:
www.ebay.com/itm/LM2596S-ADJ-Adjustable-Power-Module-DC-DC-Buck-Regulator-3A-5V-12V-24V-/191092001229


"Electrolytic caps are bad at the higher switching frequencies these supplies use (~1Mhz)"
http://forum.arduino.cc/index.php?topic=320610.msg2217782#msg2217782

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