Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 21
Output Protection, Voltage Sequencing, Power Supply Connector, Battery Pack, Refer
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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. Pin Voltage 1 +7.0 V dc to +17.0 V dc (depending on charging conditions) 2 Ground Figure 1-9. Voltage Pin Assignments for the 56W AC Adapter Battery Pack The ThinkPad computer uses a lithium-ion (Li-ion) battery pack that meets the following electrical specifications: System Overview 1-11