Abstract: Embodiments described herein provide foreign object detection based on coil current sensing. The transmitter power loss is computed directly based on the coil current, in conjunction with, or in place of the conventional computation based on transmitter input current. The enhanced precision of the computer power loss can be used to more accurately detect a foreign object near the transmitter coil during a wireless power transfer.

Abstract: A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.

Abstract: A wireless power circuit is presented that includes a transmit coil coupled to a first node; a receive coil coupled to the first node; a switch circuit coupled to the transmit coil and the receive coil opposite the first node, the switch switching the transmit coil to a second node in a transmit mode and switching the receive coil to the second node in a receive mode; a controller coupled to the first node and the second node, the controller coupled to provide signals to the switch circuit; and a self-start circuit coupled to the receive coil (or Tx coil) that automatically selects one of the coils to be used, the self-start circuit providing power to the switch circuit to hold the switch circuit in the receive mode (or predefined coil to be selected by default).

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: A charging system that includes a switching control circuit coupled to four series-coupled MOSFET transistors; a flying capacitor coupled across two of the four series-coupled MOSFET transistors; and node between the two of the four series coupled transistors that couples to an output inductor to form a buck regulator is presented. Embodiments of the charging system can have increased efficiency, can reduce the size and inductance of the output inductor, and can be produced with a low voltage process.

Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

Abstract: A system and method for controlling an over current protection trip point for a voltage regulator includes an input for receiving a monitored operating parameter of the voltage regulator. Control logic responsive to this input generates a digital current control signal. A digital to analog controller converts the digital current control signal to an analog current control signal and this analog current control signal is used for controlling a current source for generating a current that establishes the over current protection trip point of the voltage regulator.

Abstract: The DC/DC voltage converter comprises at least one switching transistor. An inductor is connected to the at least one switching transistor. A pulse width modulation circuit generates control signals to at least one switching transistor responsive to a current control signal. A current sensor connected in parallel with the inductor senses current passing through the inductor. The sensor comprises a resistor and an NTC capacitor connected in series with the resistor. Circuitry for monitoring the voltage across the NTC capacitor generates the current control signal responsive to the monitored voltage.

Abstract: An apparatus for providing programmable hysteresis control using an enable pin of a device is disclosed. An enable pin is configured to receive an input signal to enable and disable an associated device responsive to the input signal. A current sink is attached to the enable pin and is responsive to circuitry that disables the current sink responsive to application of the input signal at a first voltage level and enables the current sink responsive to application of the input signal at a second voltage level.

Abstract: A system and method for controlling an over current protection trip point for a voltage regulator includes an input for receiving a monitored operating parameter of the voltage regulator. Control logic responsive to this input generates a digital current control signal. A digital to analog controller converts the digital current control signal to an analog current control signal and this analog current control signal is used for controlling a current source for generating a current that establishes the over current protection trip point of the voltage regulator.

Abstract: A system and method for controlling an over current protection trip point for a voltage regulator includes an input for receiving a monitored operating parameter of the voltage regulator. Control logic responsive to this input generates a digital current control signal. A digital to analog controller converts the digital current control signal to an analog current control signal and this analog current control signal is used for controlling a current source for generating a current that establishes the over current protection trip point of the voltage regulator.

Abstract: A circuit comprises a digital phase locked loop for generating a synchronization signal and a voltage regulator for providing regulated output voltage responsive to the synchronization signal from the digital phase locked loop.

Abstract: A synchronous regulator includes a controller coupled to receive a reference signal and a feedback signal from the regulator and being operable to provide a pulse width modulation (PWM) signal at its output. The regulator includes at least one gate driver coupled to receive the PWM signal and includes a synchronous output switch having a phase node therebetween controlled by the gate driver, and also including regulator input current measurement circuitry. The regulator input current measurement circuitry includes a circuit that provides a signal representative of at least one phase node timing parameter. A sensing circuit is operable to sense inductor or output current provided by the regulator. A calculation circuit is coupled to receive the signal representative of the phase node timing parameters and the inductor or output current and is operable to determine the input current from the phase node timing parameters and the inductor or output current.

Abstract: A synchronous regulator includes a controller coupled to receive a reference signal and a feedback signal from the regulator operable to provide a pulse width modulation (PWM) signal at its output. The regulator includes at least one gate driver coupled to receive the PWM signal, and a synchronous output switch having a phase node there between controlled by the gate driver, and regulator input current measurement circuitry. The regulator input current measurement circuitry comprises a circuit operable for providing a signal representative of at least one phase node timing parameter, a sensing circuit operable for sensing inductor or output current provided by the regulator, and a calculation circuit coupled to receive the signal representative of the phase node timing parameters and the inductor or output current and is operable to determine the input current.

Abstract: A synchronous regulator includes a controller coupled to receive a reference signal and a feedback signal from the regulator operable to provide a pulse width modulation (PWM) signal at its output. The regulator includes at least one gate driver coupled to receive the PWM signal, and a synchronous output switch having a phase node there between controlled by the gate driver, and regulator input current measurement circuitry. The regulator input current measurement circuitry comprises a circuit operable for providing a signal representative of at least one phase node timing parameter, a sensing circuit operable for sensing inductor or output current provided by the regulator, and a calculation circuit coupled to receive the signal representative of the phase node timing parameters and the inductor or output current and is operable to determine the input current.

Abstract: A system and method for determining an initial duty cycle for startup of a voltage regulator involves generating a first current source responsive to an input voltage to the voltage regulator and generating a second current source responsive to an output voltage of the voltage regulator. A first capacitor is charged using the first current source responsive to a duty cycle of a PWM signal of the voltage regulator to a first voltage. A second capacitor is charged to a second voltage responsive to a period of the PWM signal of the voltage regulator. The initial duty cycle for startup of the voltage regulator is established as the duty cycle of the PWM signal when the first voltage is substantially equal to the second voltage.

Abstract: A circuit comprises a digital phase locked loop for generating a synchronization signal and a voltage regulator for providing regulated output voltage responsive to the synchronization signal from the digital phase locked loop.

Abstract: A circuit comprises a digital phase locked loop for generating a synchronization signal and a voltage regulator for providing regulated output voltage responsive to the synchronization signal from the digital phase locked loop.