austriamicrosystems has launched the AS1343 high-voltage DC-DC boost converter optimised for LCD or OLED display bias from low voltage inputs of single-cell battery powered applications.
The device delivers 40 mA at 24 V from two AA cells or 30 mA at 12 V from a single AA cell and can provide adjustable output voltages in the range of 5,5 to 42 V. It operates from a single 0,9 to 3,6 V supply and its 1 MHz fixed switching frequency minimises the PCB footprint by allowing the use of tiny, low profile inductors and capacitors. This constant frequency switching also results in low, predictable output noise that can be easily filtered.
The AS1343 also offers an automatic power save operation which improves its efficiency at light loads. Its low-power design reduces the operating supply current to only 22 μA. A shutdown mode requires less than 1 μA current combined with an output disconnect feature.
The IC offers 2% output voltage accuracy and an available power-ok feature indicates if voltage is within 10% of regulation. The part is ideally suited for powering a variety of different OLED or LCD displays in handheld devices or any other application requiring high output voltages.
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