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Tiny boost converter offers high current, auto power save

Posted: 25 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-up converter? DC/DC converter? power management?

austriamicrosystems is now offering a synchronous step-up DC/DC converter that delivers high-output currents and high efficiency of 96 percent.

The 1MHz AS1326 power converter delivers 620mA at 5V from two AA cells or 470mA at 3.3V from a single AA cell and can provide adjustable output voltages in the range of 2.5-5V or fixed at 3.3V. In addition, the AS1326 operates from a voltage range between 0.7V and 5V while offering adjustable soft-start and current limit.

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, said the company. The AS1326 can also synchronize the switching frequency to an external clock between 500kHz and 1.2MHz.

Another feature is the automatic power save function, which improves efficiency at light loads. This significantly reduces the power consumption of the AS1326 and significantly increases battery life, said austriamicrosystems. During forced PWM mode, the AS1326 maintains fixed frequency operation and is therefore suitable for applications with the need for predictable and easily filtered output noise like mobile communications.

The high-switching frequency and high efficiency combined with the small package size of 3mm x 3mm x 0.8mm (10-pin TDFN) makes the AS1326 suitable for a variety of compact portable applications such as GPS receivers, mobile phones, digital still cameras, blood pressure meters and all other handheld devices where extended battery operation combined with high currents are key concerns. The AS1326 operates over the industrial temperature range of -40C to 85C.

- Gina Roos

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