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Inductorless DC/DC converter loads up to 50mA

Posted: 30 Aug 2007  Print Version  Bookmark and Share

Keywords:inductorless DC/DC boost converter  boost conversion  Li-ion battery 

austriamicrosystems has unveiled the AS1301 inductorless DC/DC boost converter that is capable of output currents as high as 50mA from a wide ranging input of 2.7?-5.25V.

AS1301 offers low-noise constant frequency operation from light to higher loads. Its unique constant-frequency architecture provides both low input and low output ripple and its high 1MHz switching frequency allows the use of extremely small external capacitors. Low external parts count of two ≤220nF flying caps and two ≤2.2µF bypass capacitors, combined with the small size of the low profile (0.6mm) WL-CSP-8 package, make AS1301 suitable for space-constrained applications.

Providing a regulated output, the AS1301 is suited for a variety of applications such as two to three AA cells alkaline/NiMH or one cell Li-ion battery to 5V boost conversion in portable devices. With an excellent efficiency of up to 92 percent, the AS1301 offers lowest quiescent current and features a <5µA shutdown mode in which the output is fully disconnected from the input.

"Inductorless DC-DC converters are often the ideal solution for applications requiring a combination of low power, simplicity and low cost," said Walter Moshammer, marketing director, standard linear, austriamicrosystems. "They require only capacitors and have no need for expensive inductors to generate the desired voltage."

To prevent excessive inrush current during startup, AS1301 offers a soft-start feature plus additional functions like overload protection and thermal shutdown circuitry.

AS1301 is available in a TDFN (3x3x0.8mm) 10-pin or a WL-CSP 8-bump package and is suitable for operating environments ranging from -40°C to 85°C.




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