Abstract: A system-on-a-chip integrated circuit includes a multimedia module that produces rendered output data and a high-speed interface. A processing module generates output multimedia data in accordance with at least a portion of a multimedia application in response to input multimedia data received from either the multimedia module or the high-speed interface. The output multimedia data is provided to either the multimedia module or the high-speed interface. An on-chip DC-to-DC converter converts a battery voltage into a supply voltage that is coupled to the multimedia module, the high-speed interface, and/or the processing module.

Abstract: A processing system includes a direct current to direct current (DC-DC) converter for generating a supply voltage when coupled to a battery. A memory module stores a plurality of operational instructions. A processing module receives power from the DC-DC converter and executes the plurality of operational instructions. A power monitor circuit monitors the power source and powers down the power source when a first error condition is detected in the power source.

Abstract: An optimized battery usage circuit for a comprehensive system-on-a-chip includes a first DC-to-DC converter operable to convert a battery voltage into a supply voltage when an alternate power source is not coupled to the comprehensive system-on-a-chip. A second DC-to-DC converter is operable to convert an alternate power source voltage into the supply voltage when the alternate power source is coupled to the comprehensive system-on-a-chip.

Abstract: A universal serial bus on-the-go (USB-OTG) power source includes a direct-current to direct-current (DC-to-DC) converter for generating a source voltage when coupled to a battery. A pulse generator generates an oscillating signal when a USB-OTG enable signal is asserted. A power supply module generates a supply voltage from the oscillating signal and the source voltage.

Abstract: A method for mitigating interference from a switched-mode power supply begins by comparing a channel of interest of a plurality of channels with a switching rate of a switch-mode power supply. The method continues when the channel of interest compares unfavorably to the switching rate by adjusting the switching rate of the switch-mode power supply until the channel of interest compares favorably to the switching rate.

Abstract: A circuit for use by a multifunction handheld device is coupleable to an audio output device.

Abstract: A power supply includes a switching circuit and a transient control module. The switching circuit is switched in accordance with a regulation signal to produce an output voltage. The adjustable feedback module is operably coupled to produce the regulation signal based on the output voltage. The transient control module adjusts the adjustable feedback module by a step adjust value to produce a present output voltage. The transient control module monitors the adjustable feedback module for a present adjustment to determine when the power supply substantially achieves a steady-state condition. When the power supply substantially achieves a steady-state condition, determining whether the present output voltage corresponds to the second output voltage level. When the present output voltage does not correspond to the second output voltage level, the adjust, the monitor, and the determine steps are repeated.

Abstract: A circuit for use by a multifunction handheld device is coupleable to an audio output device, the multifunction handheld device including, a color video display device, and a host interface that is coupleable to a host device. The circuit includes a host interface that is coupleable to a host device, wherein the host interface includes a wireless communication link for communicating with the host device via a wireless local area network protocol.

Abstract: A circuit for use by a cellular telephone is coupleable to an audio output device, the cellular telephone including cellphone functionality, a Bluetooth interface, and a color video display device.

Abstract: A circuit for use by a multifunction handheld device is coupleable to an audio output device, the multifunction handheld device including a color video display device and a host interface that is coupleable to a host device.

Abstract: A method and system to determine a battery mode of an integrated circuit device are presented. The battery mode is selected with respect to first and second direct current to direct current converter devices within the integrated circuit. A voltage is received at a single pin of the device. A battery mode is determined for the device based on the received voltage, and at least one of the direct current to direct current converter circuits is configured based on the determined battery mode.

Abstract: A system and method to provide voltage to a device from the operating mode of an integrated circuit is disclosed. In a particular embodiment, the disclosed system includes an integrated circuit having an input/output pin and a DC-DC converter circuit that is coupled to the input/output pin and including a transistor element. The DC-DC converter circuit has a first mode of operation and a second mode of operation. In the first mode of operation, the DC-DC converter circuit performs voltage conversion and in the second mode of operation, the transistor element of the DC-DC converter circuit is used to selectively apply a voltage supply to an external module coupled to the input/output pin.

Abstract: A power supply system having a transistor, a linear regulator, a DC-DC converter, and a control circuit. The transistor has an input, a substrate, a first node, and a second node. The first node is operably coupled to a non-battery power source. A linear regulator is operably coupled to the second node to produce a regulated output voltage based on the non-battery power source, when enabled. A DC-DC converter is operably coupled to produce the regulated output voltage based on a battery power source, when enabled. A control circuit is operably coupled to the input node and the substrate of the transistor wherein when the DC-DC converter is enabled, the control circuit controls a reverse leakage current of the transistor, and when the linear regulator is enabled in a zero load-state, the control circuit controls a forward leakage current of the transistor, and when the linear regulator is enabled in a non-zero load-state, the control circuit provides a current limit for the linear regulator.

Abstract: Provided is a digitally-controlled linear regulator having noise-shaped component selection. The digitally-controlled linear regulator has a regulated-voltage sensor, a comparator module, a quantization module, and an impedance switching network. The regulated-voltage sensor is operably coupled to sense an output voltage of the digitally-controlled linear regulator to produce a sensed output voltage. The comparator module is operably coupled to compare the sensed output voltage with a reference voltage at a predetermined clock rate to produce a digital regulation signal. The quantization module is operably coupled to quantize the digital regulation signal to produce a quantized regulation signal. The impedance switching network is operably coupled to convert a source voltage into the output voltage of the digitally-controlled linear regulator based on the quantized regulation signal.

Abstract: Provided is a digital DC-DC regulation module. The digital regulation module includes a feedback network, a feedback error module, and a filter module. The feedback network is operably coupled to an output voltage to provide a feedback signal. The feedback error module is operably coupled to compare the feedback signal with a plurality of reference levels to produce a multi-bit error term. The filter module is operably coupled to filter the multi-bit error term to produce a regulation signal. In this manner, the digital DC-DC regulation provides an improved transient function.

Abstract: A handheld audio system includes a radio signal decoder integrated circuit (IC) and a digital audio processing integrated circuit. The radio signal decoder integrated circuit produces a digital left channel signal and a digital right channel signal from a received radio signal in accordance with an enable signal and also produces a system clock. The digital audio processing integrated circuit includes a DC-to-DC converter and a processing module. The DC-to-DC converter is operably coupled to produce at least one power supply voltage based on the system clock. The processing module is operably coupled to produce the enable signal when the at least one power supply voltage has reached a desired level and to produce audio signals for audio playback from at least one of the digital left and right channel signals and a stored digital audio file.

Abstract: A method and apparatus for conserving power of a mixed-signal system-on-a-chip having analog circuitry, involving determination of an analog variation parameter that is representative of an integrated circuit fabrication process variance of the integrated circuit, and an operational temperature associated with the analog variation parameter. With the analog variation parameter and the operational temperature, an adjustment signal is determined for a power supply level of the integrated circuit, such that power consumption of the integrated circuit is optimized. Further, in mixed-signal integrated circuits with digital and analog circuitry, a digital variation parameter is determined, where the adjustment signal determination is based on the digital variation parameter and the analog variation parameter with respect to the operational temperature. With such a method and apparatus, power consumption is optimized on an IC-by-IC basis such that power consumption of each IC is optimized.

Abstract: A method for efficient battery use begins by monitoring at least one output of the handheld device for an overload condition. The processing continues by monitoring a system voltage produced by a DC-to-DC converter for a system low voltage condition. The process continues by monitoring voltage of the battery for a battery low voltage condition. The processing then continues by enabling one of a plurality of fail-safe algorithms based on when one or more of the overload condition, the system low voltage condition, and/or the battery low voltage condition are detected.

Abstract: A class-D amplifier includes a switching transistor section, a filter, an analog to digital converter, and a feedback module. The switching transistor section is operably coupled to convert a serial input into a switched output signal. The filter is operably coupled to filter the switched output signal to produce an output of the class-D amplifier. The analog to digital converter is operably coupled to convert an analog input into a multi-bit digital signal based on a feedback signal, wherein the serial input corresponds to the multi-bit digital signal. The feedback module is operably coupled to the produce the feedback signal based on at least one varying property of the switching transistor section.

Abstract: A method for regulating a DC to DC converter of a portable device begins by sensing deactivation of a non-battery power source of the portable device, wherein an internal supply voltage is derived from the non-battery power source. The method continues by obtaining an initial regulation value for the DC to DC converter, wherein the initial regulation value is based on a battery voltage and the internal supply voltage. The method continues by enabling the DC to DC converter based on the initial regulation value, wherein the DC to DC converter converts the battery voltage into the internal supply voltage such that transitioning from the non-battery power source to a battery power source provides the substantially constant internal supply voltage.