Abstract: Circuits, devices and methods for achieving fast changes in voltage regulator outputs are disclosed. In some embodiments, a voltage regulation system can include a voltage regulator configured to receive an input voltage Vin and generate an output voltage Vout at an output node, and a transition circuit coupled to the output node, the transition circuit including one or more voltage sources, each voltage source switchably coupled to the output node and configured to provide a respective voltage.

Abstract: Circuits, devices and methods for achieving small duty cycles in switching regulators. In some embodiments, a method for generating a low duty cycle output voltage can include setting a ramp signal to a first level substantially with a first edge of a clock signal, and ramping the ramp signal from the first level towards a second level such that voltage level of the ramp signal crosses a compensation level, with the ramping beginning at a time before a second edge of the clock signal. The method can further include starting an output pulse substantially with the second edge of the clock signal, and ending the output pulse substantially with an edge of a pulse-width modulation (PWM) signal that results from the ramp signal crossing the compensation level during the ramping.

Abstract: Circuits, devices and methods for achieving fast changes in voltage regulator outputs. In some embodiments, a voltage regulation system can include a voltage regulator configured to receive an input voltage Vin and generate an output voltage Vout at an output node, and to transition Vout between V1 and V2. The voltage regulation system can further include a transition circuit coupled to the output node. The transition circuit can include a first voltage source that is switchably coupled to the output node and configured to provide a voltage associated with one of the V1 and V2 voltages to the output node during at least the transition of the voltage regulator. The voltage provided by the first voltage source can be substantially equal to one of the V1 and V2 voltages.

Abstract: Circuits, devices and methods for achieving fast changes in voltage regulator outputs are disclosed. In some embodiments, a voltage regulation system can include a voltage regulator configured to receive an input voltage Vin and generate an output voltage Vout at an output node, and a transition circuit coupled to the output node, the transition circuit including one or more voltage sources, each voltage source switchably coupled to the output node and configured to provide a respective voltage.

Abstract: Circuits, devices and methods for achieving fast changes in voltage regulator outputs. In some embodiments, a voltage regulation system can include a voltage regulator configured to receive an input voltage Vin and generate an output voltage Vout at an output node, and to transition Vout between V1 and V2. The voltage regulation system can further include a transition circuit coupled to the output node. The transition circuit can include a first voltage source that is switchably coupled to the output node and configured to provide a voltage associated with one of the V1 and V2 voltages to the output node during at least the transition of the voltage regulator. The voltage provided by the first voltage source can be substantially equal to one of the V1 and V2 voltages.

Abstract: Circuits, devices and methods for achieving small duty cycles in switching regulators. In some embodiments, a method for generating a low duty cycle output voltage can include setting a ramp signal to a first level substantially with a first edge of a clock signal, and ramping the ramp signal from the first level towards a second level such that voltage level of the ramp signal crosses a compensation level, with the ramping beginning at a time before a second edge of the clock signal. The method can further include starting an output pulse substantially with the second edge of the clock signal, and ending the output pulse substantially with an edge of a pulse-width modulation (PWM) signal that results from the ramp signal crossing the compensation level during the ramping.

Abstract: A battery charger for a portable electronic device includes a linear charger to generate a substantially constant current for charging the battery and a switching voltage regulator to convert power supplied by an external adapter to a supply voltage for the linear charger. A feedback circuit controls operation of the switching voltage regulator so that the voltage supplied to the linear charger is substantially equal to the combination of the battery voltage and the drain-to-source voltage of the linear charger. In this way, power dissipation by the linear charger is minimized without requiring the use of a high accuracy current limited adapter.