POWER MANAGEMENT CIRCUIT
First Claim
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1. A power management circuit comprising:
- a first terminal connected to an external power supply;
a second terminal connected to a battery;
a selection circuit configured to make a comparison between a voltage supplied from the external power supply via the first terminal and a battery voltage supplied from the battery via the second terminal, and to select one from among the voltage supplied from the external power supply and the battery voltage supplied from the battery;
an output terminal configured to output the voltage thus selected by the selection circuit to an external load circuit; and
a DC/DC converter charging circuit configured to charge the battery using the voltage supplied from the external power supply.
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Abstract
An external power source is connected to an adapter input terminal (first terminal). A battery is connected to a path input terminal (second terminal). A selection circuit (a first switch, a second switch, a logic circuit compares the input voltage input from the external power supply with the battery voltage, and selects one of the two. The voltage thus selected by the selection circuit is output to an external load circuit via a system power supply terminal. A charging circuit charges the battery using the input voltage supplied from the external power supply.
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Citations
8 Claims
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1. A power management circuit comprising:
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a first terminal connected to an external power supply; a second terminal connected to a battery; a selection circuit configured to make a comparison between a voltage supplied from the external power supply via the first terminal and a battery voltage supplied from the battery via the second terminal, and to select one from among the voltage supplied from the external power supply and the battery voltage supplied from the battery; an output terminal configured to output the voltage thus selected by the selection circuit to an external load circuit; and a DC/DC converter charging circuit configured to charge the battery using the voltage supplied from the external power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification