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Abstract

Disclosed is a power management system for a portable phone, for example, a cellular phone operating according to a specific mobile communications standard GSM. The power management system comprises a switching module which switches automatically from a voltage provided by a battery to a voltage provided by an external power supply when the power management system is connected to an external power supply. Furthermore, the system comprises a module of voltage regulators, each regulator providing a preset voltage, and a first and second voltage converter. The first voltage converter transforms a first input voltage having a first value to an internal voltage having a lower value. The second voltage converter transforms a second input voltage having a second value to an internal voltage having a higher value. An included reset circuit provides an automated reset function. A logic array module is connected to input ports and is associated with a communications interface. The logic array module receives signals for controlling the module of voltage regulators and the reset circuit.

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First Claim