TS331x : what a nice switching converter !

[SadE54]

The TS331x from silabs looks fantastic :
Boost converter from 0.9V
150nA quiscent current
Burst load optimized with store capacitor
Good output ..

http://www.silabs.com/products/analog/dc-dc-converter/Pages/default.aspx

[Felix]

The output not really great at 50mA (100mA at 84% efficiency). But that's a tradeoff.
The other not really great thing is it requires 7 external components.
10-TDFN 0.4mm pitch, not fun to solder by hand.

Would probably be good for a low TX power mote running from a small cell.

[SadE54]

With a frying pan and and solder stencil it's (almost) ok !