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Power management circuit for a portable electronic device including USB functionality and method for doing the same

  • US 9,203,254 B2
  • Filed: 08/25/2011
  • Issued: 12/01/2015
  • Est. Priority Date: 08/26/2010
  • Status: Active Grant
First Claim
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1. A power management circuit for a portable electronic device comprising an internal battery chargeable either through a first interface or through an AC-DC conversion circuit, said power management circuit comprising:

  • a first buck/boost converter having a Switched Mode Power Supply (SMPS) mode which is configured to be controlled either in a buck or a boost mode, said first buck/boost converter being associated with a first external coil for embodying a battery charging circuit where the internal battery is chargeable through the first interface;

    a second buck/boost converter having a Switched Mode Power Supply (SMPS) mode configured to be controlled either in a buck or a boost mode, said second buck/boost converter being associated with a second external coil for embodying a second battery charging circuit where said internal battery is chargeable through the AC/DC conversion circuit;

    a by-pass circuit for performing a by-pass of either the voltage of said internal battery or of the voltage generated by said buck/boost controllers converters when in the boost mode to a second interface, controlled by a control signal; and

    a control circuit for controlling the Switched Mode Power Supply (SMPS) mode of said first and second buck/boost converters and for controlling said by-pass circuit so as to generate a converted voltage to said second interface.

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