New Industry Products

austriamicrosystems Introduces New DC-DC Boost Converter That Delivers 42V From A Low Voltage Input

September 18, 2008 by Jeff Shepard

austriamicrosystems launched the AS1343 high voltage dc-dc boost converter optimized for LCD or OLED display bias from low voltage inputs of single cell battery powered applications.

The AS1343 delivers 40mA at 24V from two AA cells or 30mA at 12V from a single AA cell and can provide adjustable output voltages in the range of 5.5 to 42V. The AS1343 operates from a single 0.9 to 3.6V supply. The 1MHz 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 that can be easily filtered.

"LCD and OLED displays are used in almost every portable application on the market. Since these applications are battery driven, they need a high efficiency step-up converter able to deliver an output voltage of 12V or higher with a relatively moderate current of around 20mA," said Walter Moshammer, Marketing Director Standard Linear at austriamicrosystems." austriamicrosystems’ AS1343 addresses this need offering a very high efficiency even at highest output voltages. Additionally single or dual cell applications are directly supported."

The AS1343 also offers an automatic power save operation which improves the efficiency at light loads. Furthermore, the micropower design reduces the operating supply current to only 22µA. This significant reduction of the power consumption of the AS1343 substantially increases battery life in the application. Moreover the AS1343 offers a shutdown mode requiring less than 1µA current combined with an output disconnect feature.

The AS1343 offers 2% output voltage accuracy and an available power-ok feature indicates if voltage is within 10% of regulation. The part is well suited for powering a variety of different OLED or LCD displays in handheld devices or any other application requiring high output voltages.

The AS1343 is available in the compact 3 x 3x 0.8mm TDFN 10-pin package and covers the industrial temperature range of -40 to +85°C.