A present invention provides a PDA with a built-in current limiting
device. When powered by a battery, the PDA outputs a current to an
external device, wherein the current is within a first current range.
When powered by external power through an adapter, the PDA outputs the
current to the external device, wherein the current is within a second
current range. The first current range is smaller than the second current
range. Additionally, a current limiting device built into a PDA is
disclosed.