austriamicrosystems unveils new low noise 650mA DC-DC buck regulator with two LDOs for RF PAs

The AS1339 offers a high 97% efficiency, high switching frequency and noise
reduction optimized for multiband WCDMA/NCDMA and similar wireless applications
UNTERPREMSTAETTEN, Austria--(Business Wire)--
austriamicrosystems (SIX:AMS), a leading global designer and manufacturer of
high performance analog ICs for communications, industrial, medical and
automotive applications, launched today the AS1339 step down regulator. High
efficiency and tiny packaging make the AS1339 ideal for multiband WCDMA/NCDMA
applications, such as cellular handsets, wireless PDAs, and smart phones.

The AS1339 delivers up to 650mA from an input voltage range of 2.7 to 5.5V
making the device ideal for single Li-Ion cells. To improve battery lifetime low
power RF amplifiers can scale the output power dynamically by changing its
supply voltage. To support this, the output voltage of the AS1339 is dynamically
controlled using an external analogue input signal. Additionally, the extremely
fast 30µs settling time of the output voltage ensures CDMA-specifications are
not exceeded.

The AS1339 housed in a 2x2mm WL-CSP is designed for minimal space requirements
in size restricted battery powered applications such as mobile phones and other
portable wireless end equipment. The 2MHz fixed switching frequency minimizes
the PCB footprint by allowing the use of tiny low profile inductors and
capacitors. This constant frequency switching results in low predictable output
noise which is additionally reduced by the internal noise reduction circuitry.

"Power efficiency combined with reduced external component size and cost is the
key behind the AS1339 buck converter," said Bruce Ulrich, marketing director
Standard Linear at austriamicrosystems." austriamicrosystems` AS1339 is the
perfect symbiosis between efficiency and analog performance. Thanks to its small
size and fast switching speed only a minimum of PCB space is required. Combined
with the unique low noise circuitry this part is the way to go for high
efficiency RF PA designs."

With 97% peak efficiency the AS1339 boosts battery lifetime in any application.
Supporting 1.1A of peak current, the integrated 110m Ohm bypass FET provides
maximum power with minimum dropout under even low-battery conditions. The AS1339
enters bypass mode automatically during high power transmissions. The AS1339
also integrates two 10mA low-noise, high-PSRR LDO`s, making them ideal for PA
biasing. Each LDO features a separate enable, provides high output voltage
accuracy, and requires only 10nF of output capacitance.

Moreover if the supply is not required, for example mobile phone in-flight mode,
the AS1339 offers a 100nA shutdown mode combined with an output disconnect
feature. Additional features are soft start and safety features such as current
overload and thermal shutdown protection.

The AS1339 is available in the tiny 2x2mm WL-CSP 16-bumps covering the
industrial temperature range of -40°C to +85°C. For product specific
information, to download data sheets or to request free samples from
austriamicrosystems' online shop ICdirect, please visit
www.austriamicrosystems.com/DC-DC-Converter/AS1339

About austriamicrosystems

austriamicrosystems is a leading designer and manufacturer of high performance
analog ICs, combining more than 27 years of analog design capabilities and
system know-how with its own state-of-the-art manufacturing and test facilities.
austriamicrosystems leverages its expertise in low power and high accuracy to
provide industry-leading customized and standard analog products. Operating
worldwide with more than 1,000 employees, austriamicrosystems focuses on the
areas of power management, sensors & sensor interfaces and mobile infotainment
in its markets Communications, Industry & Medical and Automotive, complemented
by its Full Service Foundry activities. austriamicrosystems is listed on the SIX
Swiss Exchange in Zurich (ticker symbol: AMS). For more information, please
visit www.austriamicrosystems.com

austriamicrosystems
Ulrike Anderwald, Media Relations
phone: +43 (0) 3136 500 5856
press@austriamicrosystems.com
www.austriamicrosystems.com

Copyright Business Wire 2009