2.4-3 volts to 5 volts

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davidbball13

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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
 
Hero999 said:
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
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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.
 
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
 
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