Power-management ICs integrate class G codec

A Dialog Semiconductor product story

Edited by the Electronicstalk editorial team Mar 23, 2010

Dialog Semiconductor has announced its second generation of system-level power-management ICs, which include an integrated class G codec.

The DA9057 device's five onboard DC/DC converters optimally support 24-bit stereo audio headphone playback on a 5mW power budget.

This further extends battery life for music-enabled devices.

The DA9057 combines the industry's most flexible power sequencer with a fully programmable filter/mixer engine to support a variety of ARM-based multimedia processors.

Its power-handling capability is maximised by the integration of a dual-input switching USB power manager/Li-ion battery charger, plus five programmable DC/DC converters.

This architecture increases the current available to a system, enables 'instant on' operation and allows handsets to run cooler with less time spent charging.

A dedicated programming graphical user interface empowers OEMs to easily optimise a system's power-sequencing requirements, even when additional functionality is added late in the design cycle.

The DA9057's integrated true-ground Class G headphone driver is said to be up to 70 per cent more efficient than a standard Class AB amplifier.

A standalone filterless Class D speaker driver has also been introduced.

The DA7201 is a 3W mono audio power amplifier capable of driving 4ohm speaker loads.

The component is typically twice as efficient and has a smaller footprint than its Class AB equivalent.

Designed to interface directly to the DA9057's differential line outputs, its 1.5mm2 footprint allows placement close to the speaker, delivering a peak efficiency greater than 90 per cent and reducing heat buildup in portable applications with embedded mono or stereo speakers.

Both the DA9057 and DA7201 allow direct battery connection.

Other functions integrated on DA9057 include a programmable LED backlight driver, backup coin-cell charger, touchscreen interface, voiceband codec with sidetone, ALC (automatic level control), general-purpose filter engine and five-band equaliser.