[SOLVED] Power 5V USB peripheral from 3.7V?

[mmitchell]

Hi,

We would like to design an USB host device, but would like the device to be able to power USB peripherals (up to 500mA current) from battery when not connected to DC power. For this purpose, it seems that a power IC which could buck-up 3.7V battery voltage to 5V is needed.

Could someone recommend such a power IC for this purpose?

Additionally, is any such power IC also have built-in current-limiting ability so that we no longer need extra current-limiting switches?



Matt

 

[amayilsamy]

You can use Boost converter.

**broken link removed**

https://www.sparkfun.com/datasheets/IC/MC34063A.pdf

https://www.farnell.com/datasheets/87833.pdf

And lot of boost converters ICs available in market.

 

[Ice-Tea]

A lot of vendors have good integrated solutions for such things. Linear tech, Maxim, TI.... This per example will do pretty much all you need it to (I expect you will also need to charge your battery)

These above vendors all have parametric search in case you need another battery chemistry, don't like the BGA package or what have you...

 

[mmitchell]

I am reviewing these products. Thanks!