Thought this device is interesting.  Below is the brief description
from the datasheet, and the link to the datasheet is

http://www.st.com/stonline/prodpres/discrete/vipower/vb409/vb409.htm

Cheers, Ling SM (not related to STm)


The VB409 VB409SP are fully protected positive
voltage regulator designed in STMicroelectronics
High Voltage VIPower] technology. The devices
can be connected directly to the rectified mains
(110V/230V). The devices are well suited for
applications powered from the AC mains and
requiring a 5V DC regulated output voltage
without galvanic insulation. VB409, VB409SP
provides up to 70 mA output current (internally
limited) at 5V. The included over current and
thermal shutdown provide protection for the
device.

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