2.4-3 volts to 5 volts

[davidbball13]

hello i am big on making USB chargers but i dont want to have to use a 9 volt battery and a 7805 i want to use two AA batterys so i am assuming i need a DC to DC converter. if so what kind were to buy it and how to wire it.


thanks

 

[RobertD]

**broken link removed**

 

[RobertD]

Here's another...

DC-DC converter to step up input voltage

 

[davidbball13]

**broken link removed**

looks very hard all of the schematics look that way.
have you guys seen the minty boost it have two AA batterys and boosts it up to 5 for usb

 

[Hero999]

Not all SMPs ICs are that hard to use - National's simple switcher range of ICs are much easier to use.

**broken link removed**

And it's possible to build one from discrete components.
Official Home Page of Roman Black

 

[crutschow]

Not all SMPs ICs are that hard to use - National's simple switcher range of ICs are much easier to use.

**broken link removed**

And it's possible to build one from discrete components.
Official Home Page of Roman Black

These are step-down converters and a step-up is needed. National also has those at **broken link removed**. The LM2622 or LM2578A among others, which operate at a 2V minimum input, would appear to meet the requirements.

 

[Hero999]

If you want a simple discrete solution, then you can build a boost converter from a couple of transistors.
https://www.electro-tech-online.com/attachments/switch-pdf.9974/

 

[RobertD]

The MAX1932 IC meets your requirement.

Small Circuit Footprint
Circuit Height < 2mm
2.7V to 5.5V Input
4.5V to 90V Output
No Overshoot
Accurate High-Side Current Limit
Avalanche Indicator Flag
8-Bit SPI-Compatible DAC
Compatible with External DAC
0.5% Accurate Output
Low Ripple Output (< 1mV)
Small 12-Pin, 4mm x 4mm Thin QFN Package

 

[audioguru]

Make the Minty Boost.

 

[davidbball13]

Make the Minty Boost.

that is what i want i will have to go check out its inctrustable

 

[KMoffett]

AnyVolt Micro - Universal DC-DC converter steps voltage down and up

'bout the same price as the Minty Boost kit.

Ken

 

[davidbball13]

AnyVolt Micro - Universal DC-DC converter steps voltage down and up

'bout the same price as the Minty Boost kit.

Ken

i would rather the minty boost kit