Hi all,
I need to take 5V from 2 AA battery. I purchase 2 modules, but booth waste a lot of current (40mA one and 60mA the other)
Is this normal?
I mesured a diode laser consum, from the batteries to the boost board = 60mA, from the Vout of boost board to laser = 22mA .
Is there a way to boost 2.3V to 5V with less mA consum.
The boards are these:
https://es.aliexpress.com/item/10-u...32669914226.html?spm=a2g0s.9042311.0.0.Ix4j6n
https://es.aliexpress.com/item/5PCS...32809714512.html?spm=a2g0s.9042311.0.0.bRev8T

Thks in advance!

 

All switching converters have a bias operating current even with no output load.
Generally the higher the current rating of the regulator, the higher is this bias current.

For operation at such a low current you need a converter that can operate with a very low bias current and high efficiency at low output currents, such as this.

 

I use this one...
http://www.microchip.com/wwwproducts/en/MCP1253#documents
Nice little device..

 

Ian Mr deb needs that one there both good tho.
The micro chip one is easier to work with as parts go only 6 parts needed.
The LTC needs 9.

 

Ian Mr deb needs that one there both good tho.
The micro chip one is easier to work with as parts go only 6 parts needed.
The LTC needs 9.

MrDeb!!!! Is he here as well??? ( running to the hills!!! )

 

All switching converters have a bias operating current even with no output load.
Generally the higher the current rating of the regulator, the higher is this bias current.

For operation at such a low current you need a converter that can operate with a very low bias current and high efficiency at low output currents, such as this.

Excuse me i have a question, in brief i have a topic in this section about boosting a 3.7 volts (out of a lipo batteries of my power bank) to a 5 volts to be able to charge a mobile phone ( because the charging circuit of the power bank was burned cuz it fell in water)

I tried two things to boost up this 3.7 volts to 5 volts:
First,i ordered a boost converter that gives 5.1 volts but it won't charge the phone!

(with the original power bank lipo batteries it charged for like 30 seconds) the battery voltage didn't drop before and after charging

(I tried another 4 li ion batteries fully charged it charged the phone 11% in 1.5 hour then stopped charging ) the battery voltage dropped from 3.7 to 3.3 after the charging time

* my question is, i think it's an ampere problem i think the output ampere it not enough to charge the iPhone is this because the bias operating current of the conveter? And if so what is the solution?
My boost converter specs (130 uA Quiescent current):
http://ram-e-shop.com/oscmax/catalog/product_info.php?cPath=261&products_id=3637

----------------

secondly a modified joule thief that gave me an output up to 30 voltage and with the use of 5.1 Volta zener diode it gives me the required 5.1 volts but when i connect any thing to the output like a LED or connecting it to charge the iPhone it drops to 2.3 volts even when the output is 30 volts, why is this happening? Anyway to make a stable 5V output that can charge the phone out of the lipo batteries (3.9 v)?