FYI: From http://www.usb.org/developers/devclass_docs/batt_charging_1_0.zip
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Battery Charging
Specification
Revision 1.0
Mar 8, 2007
p.19:
If the current drawn from a USB charger changes suddenly within the range of
0mA to 500mA, then the
transient voltage from a USB charger shall not go below VCHGR_UNDSHT. Under no
circumstances shall the
transient voltage of a USB charger exceed VCHGR_OVRSHT.
p.23:
Charger Overshoot Voltage VCHGR_OVRSHT 6.0 V max.
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Though we couldn't even attach a USB-charger compliant to this spec, as it has
to be equipped with micro-USB plug, we should expect to see voltages on
USB-receptacle of up to 6.0V AT LEAST.
I think it's a strong argument for additional OVP extending our actual
abs.max.rating of 5.5V to limits safely beyond 6.0V, like we are actually
about to do for GTA03.
cheers
jOERG
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