Analogic Tech Offers 800mA Voltage-Scaling Step-Down Converter
Advanced Analogic Technologies Inc. announced the AAT1142, a voltage-scaling step-down converter for portable applications. Supplying up to 800mA output current, the AAT1142 is the first voltage-scaling step-down converter to offer Dynamic Voltage Management through both a two-wire I2C interface and AnalogicTech's patented 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 for AnalogicTech. "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 in programmable steps from as low as 0.6 up to 2.0V with 50mV resolution. The converter delivers up to 800mA output current over a wide 2.7 to 5.5V input range with up to 93% efficiency. Designed to optimize power efficiency across the full load range, the AAT1142 features a multi-function 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. Dynamic Voltage Management allows a host system to quickly adjust the AAT1142 output voltage on-the-fly to track microprocessor idle-active states, thereby providing high power to the processor only when needed, and saving precious battery life.
Operating at a 2MHz switching frequency, the AAT1142 reduces system footprint by supporting the use of a very small, space-saving external inductor and capacitors. Over-temperature and short-circuit protection circuits safeguard the AAT1142 and system components from potential damage. The converter also features internal soft start and 100% duty cycle low-dropout operation. The AAT1142 is available now in a Pb-free, 3x3mm, low-profile, 12-pin TDFN package or a Pb-free, 12-pin TSOPJW package. The device is specified over the -40 to +85°C operating temperature range and device sells for $1.27 each in 1,000-unit quantities.
