Dialog preps power management IC with audio

LONDON — Dialog Semiconductor plc has announced a system-level power management IC that includes a class G codec. The device is called the DA9057, and has five on-board dc/dc converters to support 24-bit stereo audio headphone playback on a 5-mW power budget.

The DA9057 combines a power sequencer with a programmable filter/mixer engine to support ARM-based multimedia processors. It integrates 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, Dailog claimed.

The chip has a programming graphical user interface to enable OEMs to alter the system's power sequencing requirements, even when additional functionality is added late in the design cycle. The integrated Class G headphone driver is 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 3-W mono audio power amplifier capable of driving 4-ohm speaker loads. The component is typically twice as efficient and has a smaller footprint than its Class AB equivalent.

Designed to connect to the DA9057's differential line outputs, its 1.5 square millimeter footprint allows placement close to the speaker, delivering a peak efficiency greater than 90 per cent, and reduces heat build-up 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, touch-screen interface, voice-band codec, automatic level control, general purpose filter engine and 5-band equalizer.

Engineering samples of the DA9057 are available now in a 7 mm by 7 mm BGA 169-pin package. Engineering samples of the DA7201 will be available from April in a wafer level CSP 9 package. Volume production delivery for both devices will begin in Q4 of 2010.

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