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Multimode battery charger

  • US 9,419,455 B2
  • Filed: 09/30/2013
  • Issued: 08/16/2016
  • Est. Priority Date: 09/06/2013
  • Status: Active Grant
First Claim
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1. A multimode battery charger circuit comprising:

  • a constant current control loop circuit including a programmable reference generator;

    a constant voltage control loop circuit including a programmable reference generator;

    a linear gate driver coupled to the constant current control loop circuit and the constant voltage control loop circuit, the linear gate driver having an output to provide a voltage to a gate of a pass transistor during linear mode charging operations, the pass transistor further coupled to a battery pack or system load;

    a pulse width modulation (PWM) control circuit coupled to the constant current control loop circuit and the constant voltage control loop circuit, the PWM control circuit having an output to control power provided by a plurality of output transistors coupled in series during switch mode charging operations, the plurality of output transistors further coupled to the battery pack or the system load; and

    mode control circuitry coupled to the linear gate driver and the PWM control circuit, the mode control circuitry configured to selectively enable the linear gate driver or the PWM control circuit in accordance with a charge mode indication signal.

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