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DC/DC boost converter delivers 50V from single Li-ion cell

Posted: 07 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DC-DC boost converter? LCD? OLED display?


austriamicrosystems has launched the AS1340 high voltage boost regulator with up to 50V output voltage, which is well suited for LCD or OLED display bias in battery-powered applications.

The AS1340 delivers 50mA at 24V or 30mA at 36V from a single Li-ion cell and can provide adjustable output voltages in the range of 2.7-50V. The AS1340 operates from a single 2.7-5.5V supply. Additionally the supply of the AS1340 can be split to allow a higher supply voltage, up to 50V, for the coil. 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 that delivers an output voltage of 12V or higher with a relatively moderate current of around 20mA," said Walter Moshammer, marketing director standard linear at austriamicrosystems. "AS1340 addresses this need offering a very high efficiency even at highest output voltages. The chip is able to deliver enough current suitable for high voltage applications like phantom supplies for microphones."

High efficiency
AS1340 also offers an automatic powersave operation which improves the efficiency at light loads. Moreover, the micropower design reduces the operating supply current to only 30?A. This significant reduction of the power consumption of the AS1340 substantially increases battery life in the application. The device also offers a shutdown mode requiring less than 1?A current combined with an output disconnect feature.

The AS1340 offers 2 percent output voltage accuracy and an available power-ok feature indicates if voltage is within 10 percent of regulation. Due to the variable supply concept and the optional output disconnect, the AS1340 allows a very flexible design suitable for a broad range of applications. The part is suited for powering a variety of different OLED or LCD displays in handheld devices or to provide the phantom supply for professional microphones where extended battery lifetime is essential.

AS1340 is available in the compact 3mm x 3mm x 0.8mm TDFN 8-pin package and covers the industrial temperature range of -40C to 85C.

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