Just dug into this... My notes:
BBB Power:
No onboard input voltage regulation! Input jack connects directly to
TPS65217C PM IC.
>From tps65217c.pdf:
-----
Absolute Maximum Supply voltage range, USB,
AC: -0.3 to 20 V
RECOMMENDED OPERATING CONDITIONS - Supply voltage, USB, AC: 4.3 to 5.8 V
Maximum Input
current from AC: 2.5 A
VIN(OVP) Input over voltage detection threshold USB,
AC: 5.8 (typ)6 (max)6.4 V
provides a linear battery charger for single-cell Li-ion and Li-Polymer
batteries...
-----
The 5V rails VDD_5V and SYS_5V go to the LEDs, the expansion connector, the
DVI/HDMI connector, and the USB connectors. Unless you are using these for
something which needs regulated +5V, the wider 4.3 to 5.8 V limits will
keep the board itself happy.
It will safely disconnect from an input that exceeds about 6V, and can then
handle up to 20V. But it is _not_ protected from reverse polarity!
>
--
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