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DC/DC supplies 150mA at 3.3V from a single AA cell

Posted: 06 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:austriamicrosystems? DC/DC? converter? AS1322?

austriamicrosystems is expanding its family of DC/DC converters with the new AS1322, a synchronous, high-efficiency, step-up converter that comes in a small 6-pin TSOT package. The AS1322 supplies 150mA output current at 3.3V from a single AA cell battery with possible output voltages in the range of 2.5-5V, operating from an input voltage between 0.85V and 5.5V.

"Many portable devices require small, high-efficiency power converter solutions to extend the time between battery replacement or recharge cycles," said Walter Moshammer, director of marketing standard linear at austriamicrosystems. "austriamicrosystems' AS1322 addresses this need by integrating a 1.2MHz fixed frequency, synchronous boost converter, which is operating down to an input voltage of 0.85V, in a thin-TSOT23 package."

Two versions
The 1.2MHz fixed switching frequency minimizes PCB footprint by allowing the use of tiny, low-profile inductors and ceramic capacitors. The device is available in two versions: a power-saving variant (AS1322A) and a fixed-frequency variant (AS1322B). The AS1322A offers an automatic power-save operation in cases of light loads, which improves efficiency by switching the device in a sleep state as long as the output voltage is within the regulation band. This reduces power consumption down to 305A and increases battery life, the company said. The anti-ringing control circuitry reduces EMI by damping the inductor in discontinuous mode. AS1322B, on the other hand, maintains fixed-frequency operation at lighter loads and is therefore suitable for applications with the need of a predictable and easy-to-filter output noise like mobile communications.

The AS1322 is suited for a variety of compact portable applications such as cellphones, MP3 players, pagers, GPS receivers and other handheld devices where extended battery operation with a minimum of space required is critical.

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