Not a chip but perhaps can be used in combination with a chip: Low voltage (down to 0.1V) driven oscillator circuit (joul thief with a JFE= T). /Ruben > Hi >=20 > I am wondering if anyone has found a device that meets the following... >=20 > Device power min 2.1v or lower, max greater than 8.1v >=20 > Voltage input for conversion, max 8.1v, min as close to zero as possible. >=20 > Output 2.1v at circa 10mA. >=20 > This is for a small device powered from a set of super caps. Once charged= , or > partially so, it can startup but then run until the caps are drained. The > device can be powered from the output once it is started.=20 >=20 > Current plan is to use the caps in series. If I can find a suitable devic= e, > the max input could be less than 8.1v if almost all the charge in the cap= s can > be used. >=20 > I have found some that get close but most have a min that is near 2v (1.8= v for > instance). >=20 > Thanks >=20 > Veronica >=20 >=20 > --=20 > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Ruben J=F6nsson AB Liros Electronic Box 9124 200 39 Malm=F6 Sweden www.liros.se Tel +46 40142078 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .