ESP8266 Community Forum

- Sun Feb 15, 2015 10:14 am #9832

...
The LDO reaper7 suggested is probably the best & cheapest solution, but you should test how the LDO behaves if the input voltage drops below 3.4V.

3152mV and still works
probably a deepsleep current consumption bug in version 095
and I can see battery consumption in a shorter period of time..

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next day...
2936mV and all systems still works


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end
2768mV

MY GITHUB: https://github.com/reaper7/

SDM Energy Meter: https://github.com/reaper7/SDM_Energy_Meter
MLEDScroll (TM1640 led matrix): https://github.com/reaper7/MLEDScroll

- Thu Feb 19, 2015 8:59 am #10150

I'm using aTPS61200DRCT to boost and regulate the power from a lipo with good luck so far. Attached is the schematic.
http://www.digikey.ca/product-detail/en/TPS61200DRCT/296-21663-1-ND/1534252

Bymiker, as far as I can tell this is a tiny surface mount device. How do you manage the physical aspects of using it?

- Thu Feb 19, 2015 9:16 am #10151

Is there a clear winner product for this scenario?

I guess a clear winner would be something like the LTC3113. This is a combined buck-boost regulator, which can provide a stable 3.3V output with an input voltage from 1.8V-5.5V with a quiescence current of about 50uA.
But it's quite expensive and even the TSSOP package has to be reflowed, so it's impractical for most hobbyists.
The LDO reaper7 suggested is probably the best & cheapest solution, but you should test how the LDO behaves if the input voltage drops below 3.4V.

But reaper's LDO is also in a tiny package as far as I can see from the datasheet. How does anyone without industrial micro-manipulation machinery use these things?

- Thu Feb 19, 2015 10:03 am #10152

I guess a clear winner would be something like the LTC3113. This is a combined buck-boost regulator, which can provide a stable 3.3V output with an input voltage from 1.8V-5.5V with a quiescence current of about 50uA.

FYI, I tried the MAX1724 which is a similar buck-boost.

input: 0.8-5.5V
Output: 3.3V (adjustable)
quiescent: 1.5 uA

Worked great with small LiPos.

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