smallest 6V to 3.3V and or 5V supply switched regulator

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I am thinking of using a 6V supply and my device has a requirement for a 3.3V (for micro) and another 5V (for usb) requirement....anyone know what kind of regulator would be ideal? I want to use switched regulator..

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LDO or switched regulator . What's the current needed ?

1) Studio 4.18 build 716 (SP3)
2) WinAvr 20100110
3) PN, all on Doze XP... For Now
A) Avr Dragon ver. 1
B) Avr MKII ISP, 2009 model
C) MKII JTAGICE ver. 1

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If your project spends most of its time in sleep mode, use a linear. Microchip mcp1702 is available in 3.3 and 5V, with Iq at 1.5 uA.Vin Max is 6V though!!

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well i was thinking of running a UC3AXXXX chip with usb 3g card.... all under 500mA. I found MIC4680 and it seems very promising! Anyone used it??

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Use the NatSemi webbench. You just enter a few design parameters, and it spits out a complete schematic with digikey part numbers and also size and cost estimates.

For a 5 to 7V input, 3.3V output and 500 mA, Webbench lists a dozen designs around 85% efficient and about 160 mm2 (and up) in size.

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I have a question: >>Why<< do you need "5V for USB"? An e.g. FTDI chip will happily get its 5V needs from the USB and interface to a 3V processor on the "target" side. In fact if this device is only active when USB is connected, you need no power supply at all for modest-draw apps.

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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I am hooking up a 3g modem to my micro :) so the 3G modem needs 5V power. Anyways I am using Micrel chips now :) two of them...one to drive the micro at 3.3V and another to drive the usb at 5.0V.