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austriamicrosystems introduces high efficiency 200mA DC-DC step-up converter with buck function

26th November 2009

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austriamicrosystems complements its DC-DC product portfolio with the introduction of a 200mA boost converter. The topology of the AS1337 provides an innovative step down function enabling buck-boost functionality. With a continuous transition between boost and regulated buck mode the AS1337 is ideal for single for dual cell applications.

The AS1337 DC-DC buck-boost converter offers an adjustable output voltage range from 2.5 to 5.0V from an input voltage range of 0.65V to 4.5V. From a two cell battery with a voltage range between 1.8V and 3.6V the AS1337 offers 200mA of output current at 3V. From a single cell 100mA can still be generated. Combined with two small capacitors and one chip-scale inductor the AS1337 provides a small and low profile footprint solution, typically required in battery powered applications. Furthermore this low voltage DC-DC IC offers power-ok signaling.

austriamicrosystems’ AS1337 implements innovative boost architecture with efficiencies up to 97%. Furthermore the converter is capable of entering into buck mode when the input voltage is higher than the output voltage and therefore adopts a buck-boost behavior at the cost of a single boost converter.

In shutdown mode the AS1337B version offers a battery disconnect function, where the input is disconnected from the output. The AS1337A connects the input to the output enabling the supply of e.g. real time clocks or memories during shutdown for example. austriamicrosystems’ AS1337 draws only 10nA shutdown current, which further extends battery life time.

Especially in dual cell applications the input voltage can be up to 3.6V when using fresh batteries. Even though this voltage is only available for a very short time, it can damage a 3V system. AS1337 enters a regulated buck mode in order to avoid this problem. A conventional boost converter does not regulate the output voltage in this case. The customer gets buck-boost behavior at the cost of a standard boost converter” commented Bruce Ulrich, Marketing Director Consumer and Communications at austriamicrosystems. “Furthermore the optimized boost architecture of the AS1337 guarantees excellent efficiencies during step-up operation of up to 97% which is significantly higher than the efficiency of a conventional buck-boost converter.