Charger and portable device having the same
First Claim
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1. A charger comprising:
- a USB detector connected to a data pin, operative to detect an effective resistance on the data pin during a detection period to determine a first control signal and a second control signal;
a power input terminal connected to a power input pin;
a first power transistor connected to the power input terminal and controlled to supply a charging current;
a charge current controller connected to the USB detector and a gate of the first power transistor, operative to control the charging current according to the second control signal;
a power supply terminal;
a second power transistor connected between the power input terminal and the power supply terminal; and
a USB transceiver power controller connected to the USB detector and a gate of the second power transistor, operative to control the second power transistor to generate a regulated voltage at the power supply terminal according to the first control signal.
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Abstract
A charger for a portable device includes a USB detector connected to a data pin to detect the effective resistance on the data pin before a USB transceiver is enabled, to identify USB or adapter plug in and control a charging current for a battery accordingly.
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Citations
7 Claims
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1. A charger comprising:
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a USB detector connected to a data pin, operative to detect an effective resistance on the data pin during a detection period to determine a first control signal and a second control signal; a power input terminal connected to a power input pin; a first power transistor connected to the power input terminal and controlled to supply a charging current; a charge current controller connected to the USB detector and a gate of the first power transistor, operative to control the charging current according to the second control signal; a power supply terminal; a second power transistor connected between the power input terminal and the power supply terminal; and a USB transceiver power controller connected to the USB detector and a gate of the second power transistor, operative to control the second power transistor to generate a regulated voltage at the power supply terminal according to the first control signal. - View Dependent Claims (2, 3, 4)
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5. A portable device comprising:
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a data pin; a USB transceiver connected to the data pin; a power input pin; and a charger connected to the data pin and connected between the power input pin and the USB transceiver, operative to detect an effective resistance on the data pin during a detection period to control a charging current, said charger including a USB detector connected to the data pin, operative to detect the effective resistance on the data pin during the detection period; a power input terminal connected to the power input pin; a first power transistor connected to the power input terminal and controlled to supply the charging current; a charge current controller connected to the USB detector and a gate of the first power transistor, operative to control the charging current according to the second control signal; a power supply terminal connected to the USB transceiver; a second power transistor connected between the power input terminal and the power supply terminal; and a USB transceiver power controller connected to the USB detector and a gate of the second power transistor, operative to control the second power transistor according to the first control signal, to provide power for the USB transceiver; wherein the charger determines a setting of the charging current, which has a first value when USB plug in is detected and a second value greater than the first value when adapter plug in is detected. - View Dependent Claims (6, 7)
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Specification