12V DC to 5V DC Regulator, Not LM7805

I am looking to power a USB "dongle" from a 12 volt battery. From what
I've read USB is 5V @~100mA. I'd like to build a voltage regulator to
do this, and I'd rather not lose half of my power to heat. Can anyone
point me at a circuit that is more efficient then a standard voltage
regulator circuit?

Thanks.

.

Relevant Pages

  • Re: Car power for Legend C?
    ... > has a maximum of 5.25V/500mA with the load looking at the source. ... > power available, it can never get more than the maximum. ... > Even if the USB source is rated at 1000mA capacity, ... > About the voltage: As mentioned, the standard voltage in a USB link ...
    (sci.geo.satellite-nav)
  • Re: How to use a LaCie Rugged Drive without a computer?
    ... but they don't have such a power supply listed on their pages. ... a USB port and also plugs into the standard round power jack. ... Its the only voltage. ... Thats pretty common with external drives with laptop drives in them. ...
    (comp.sys.ibm.pc.hardware.storage)
  • Re: How to determine if a PC is running
    ... How about checking voltage on the mouse input? ... Sam Carleton wrote: ... to know if the PC is turned on/powered up so that when the power to the ... It has been determined that checking voltage on the USB does not work ...
    (microsoft.public.windowsxp.hardware)
  • Re: Car power for Legend C?
    ... has a maximum of 5.25V/500mA with the load looking at the source. ... The load does not usually spend the maximum available power ... Even if the USB source is rated at 1000mA capacity, ... About the voltage: As mentioned, the standard voltage in a USB link is 5.25 ...
    (sci.geo.satellite-nav)
  • Using the FT245BM in a 3.3V only design...
    ... FT245BM run from the 5V power from the USB, and have the rest of my ... whereas the voltage being used everywhere else is ... I also place some LC filtering and some overvoltage protection on the ...
    (sci.electronics.design)