>>It's designed for 1.8-5.5 Vin operation but will start on 0.8V in.
>
>I have seen a chip recently that claimed to start on 0.65V IIRC.
>Also apparently Microchip have a similar boost converter that is
>due to be announced imminently.

If you want something that starts at low voltage, try this device ...

http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1031,C1060,P90287

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