Need low input current to supply higher output load current 2

[ELEK55]

Hello,

Is there an IC, scheme, or circuit that will allow a load of 800ma DC to be operated from a source that will only supply about 350ma DC.

 

[MikeHalloran]

No.


Mike Halloran
Pembroke Pines, FL, USA

 

[Skogsgurra]

If the available voltage is about three times higher than the needed output voltage, yes.

If you need your 800 mA for a short period, yes.

But not if you need the 800 mA continuously at a voltage that is more than around one third of the available voltage.

So, what are the voltage levels? In - and out?

Is the application for a short time (seconds - minutes) load - or continuous?

Even better: tell us what you are trying to do. More information, better answer - as always.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[ELEK55]

Thank you for your response.

The available voltage is 10.5 volts at 350ma. The needed output voltage is 3.3 volts at 800ma. The 800ma is needed for 60 seconds. The purpose is to supply power to a module while it goes throug a shut down sequence.

 

[Skogsgurra]

OK. You have 3.7 watts available and need 2.7 watts at 3.3 volts. A simple switcher will do the job. Have a look at National Semiconductor or just go to the nearest Radio Shack or Conrad, if in Europe, and buy a module that does what you want.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...