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DC/DC IC enables management through I?C, S2Cwire

Posted: 17 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Advanced Analogic? AnalogicTech? AAT1142? step-down? DC/DC converters?

Advanced Analogic Technologies said its AAT1142, an 800mA voltage-scaling step-down converter for portable applications, is the first to offer dynamic voltage management through both a two-wire I?C interface and the company's single-wire Simple Serial Control (S2Cwire) digital interface.

"Most mid- to high-end handsets available today incorporate I?C, so they can easily take advantage of the power efficiencies of voltage scaling. More cost-sensitive handsets, however, simply cannot afford the hardware and firmware overhead associated with implementing I?C," explains Bill Weiss, product line director. "Through its S2Cwire interface, the AAT1142 gives designers the ability to bring the power savings of voltage scaling to virtually any portable system."

The AAT1142 provides dynamic voltage management (i.e., allows the host system to quickly adjust the AAT1142 output voltage on-the-fly to track microprocessor idle-active states) in programmable steps from as low as 0.6V up to 2V with 50mV resolution. Working from a 2.7V to 5.5V input, the converter delivers up to 93 percent efficiency. The AAT1142 features a multifunction MODE/SYNC pin that allows the user to maintain constant frequency and low noise across the operating range or synchronize the converter to an external clock.

The AAT1142 operates at 2MHz, and thus small inductors and capacitors can be used to reduce system footprint. Over-temperature and short-circuit protection circuits are built-in. The converter also features internal soft-start and 100 percent duty-cycle, low-dropout operation.

The AAT1142, rated for operation over -40C to 85C and available in a Pb-free, 3-by-3mm, 12-pin TDFN package or a Pb-free, 12-pin TSOPJW package, is priced at $1.27 each in 1,000 quantities.

- Vince Biancomano

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