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DC/DC IC offers voltage management through I²C, S2Cwire

Posted: 21 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 I²C interface and the company's single-wire Simple Serial Control (S2Cwire) digital interface.

"Most mid- to high-end handsets available today incorporate I²C, 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 I²C," 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 per cent 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 synchronise 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 per cent duty-cycle, low-dropout operation.

The AAT1142, rated for operation over -40°C to 85°C and available in a Pb-free, 3-by-3mm, 12-pin TDFN package or a Pb-free, 12-pin TSOPJW package, is priced at Rs.58.98 ($1.27) each in 1,000 quantities.

- Vince Biancomano

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