Boost converter has adjustable output voltages
An Austriamicrosystems product story
Edited by the Electronicstalk editorial team Jul 27, 2009
Austriamicrosystems has launched the AS1344 high-voltage DC-DC boost converter, optimised for biasing of photodiodes, LCD or PMOLED displays powered from single cell batteries.
At 15V output voltage, the AS1344 delivers 120mA from a 3V or 28mA from a 1.5V input voltage.
The AS1344 operates from a single 0.9V to 3.6V supply and provides adjustable output voltages in the range of 5.5V to 42V.
The 1MHz fixed switching frequency minimises 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.
'Battery-powered applications with PMOLED, or e-ink displays, need a high-efficiency step-up converter that 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.
'Single or dual cell applications are also supported,' he added.
The AS1344 also offers an automatic power save operation which improves the efficiency at light loads.
The micro-power design reduces the operating supply current to 22uA.
This reduction of power consumption increases battery life in the application.
Austriamicrosystems' AS1344 offers both a 1uA 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 AS1344 offers two per cent output voltage accuracy and a power-OK feature indicates when voltage is within 10 per cent of regulation.
The part is suitable for powering a variety of different PMOLED, e-ink or LCD displays in hand-held devices, or other applications such as microphones, photodiodes or LED strings requiring high voltages.
The AS1344 is available in a 3mm x 3mm x 0.8mm TDFN 10-pin package and covers the industrial temperature range of -40C to +85C.
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