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DC/DC converter minimizes PCB footprint

Posted: 24 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? PCB? LCD?

AS1344 DC/DC converter

austriamicrosystems has released the AS1344 high voltage DC/DC boost converter optimized for biasing of photodiodes, LCD or PMOLED display powered from single cell batteries.

The AS1344 operates from a single 0.9- to 3.6V supply and provides adjustable output voltages in the range of 5.5V to 42V. At 15V output voltage the AS1344 delivers 120mA from a 3V or 28mA from a 1.5V input voltage. The converter features 1MHz fixed switching frequency that minimizes 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.

"Battery powered applications with PMOLED, or e-ink displays, need a high efficiency step-up converter which is able to deliver an output voltage of approximately 15V at a relatively moderate current," said Bruce Ulrich, marketing director standard linear at austriamicrosystems. "The AS1344 addresses this need offering very high efficiency even at high output voltages. Additionally, single or dual cell applications are also supported."

The AS1344 also offers an automatic power save operation which improves the efficiency at light loads. Its micro-power design cuts operating supply current to only 22?A. This significant reduction of power consumption substantially increases battery life.

In addition, the converter offers both a 1?A shutdown mode, combined with an output disconnect feature. This capability reduces PCB space and BOM in applications such as PMOLED or e-ink displays, where disconnection is required for optimal operation and reduced power consumption.

With an adjustable soft-start feature the AS1344 enables power up of applications even with drained batteries by limiting the input current during start-up.

The device also offers 2 percent output voltage accuracy and a power-ok feature indicates when voltage is within 10 percent of regulation. The part is ideally suited for powering a variety of different PMOLED, e-ink or LCD displays in handheld devices, or other applications such as microphones, photodiodes or LED strings requiring high voltages.

The AS1344 is available in the compact 3mm x 3mm x 0.8mm TDFN 10-pin package and covers the industrial temperature range of -40C to +85C.

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