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Charger and portable device having the same

  • US 8,525,484 B2
  • Filed: 09/11/2012
  • Issued: 09/03/2013
  • Est. Priority Date: 08/19/2009
  • Status: Expired due to Fees
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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