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Output Protection
A short circuit placed on any dc output (between two outputs or
between an output and a dc return) latches all dc outputs into a
shutdown state, with no hazardous condition to the power supply.
If an overvoltage fault occurs in the power supply, the power supply
latches all dc outputs into a shutdown state before any output
exceeds 135% of the nominal value of the power supply.
Voltage Sequencing
When power is turned on, the output voltages reach their operational
voltages within 2 seconds.
Power Supply Connector
The following connector is used with the AC adapter. The total
power capacity of this connector must not exceed 4.0 A.
Refer to Figure 1-9 for the appropriate adapter pin assignments.
Figure 1-9. Voltage Pin Assignments for the 56W AC Adapter
Pin Voltage
1 +7.0 V dc to +17.0 V dc (depending on charging conditions)
2 Ground
Battery Pack
The ThinkPad computer uses a lithium-ion (Li-ion) battery pack that
meets the following electrical specifications:
System Overview 1-11