DC-DC Converter delivers 300 mA with up to 90% efficiency.
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From input voltage of 1.8-5.5 V, Model AS1331 offers adjustable output voltage of 2.5-3.3 V. Fixed output voltage variants of 2.5, 3.0, and 3.3 V with ±3% accuracy are also available. Device implements 4-switch architecture to deliver efficiencies up to 90% while, at light loads, quiescent current is as low as 22 µA. Operating from -40 to +85°C, buck-boost converter is suited for dual or triple cell alkaline/NiCad/NiMH as well as single cell Li-Ion battery applications.
Original Press Release:
Austriamicrosystems Introduces High Efficiency 300mA DC-DC Buckboost Converter
AS1331 delivers 300mA with up to 90% efficiency extending battery life time for handheld applications
Unterpremstaetten, Austria (March 16, 2009) - austriamicrosystems (SWX: AMS), a leading global designer and manufacturer of high performance analog ICs for communications, industrial, medical and automotive applications, complements its DC-DC product portfolio with the introduction of a buck-boost converter. The topology of the
AS1331 provides continuous transitions between buck and boost mode making it ideal for dual or triple cell alkaline/NiCad/NiMH as well as single cell Li-Ion battery applications.
The AS1331 offers an adjustable output voltage range from 2.5 to 3.3V from an input voltage range of 1.8 to 5.5V. To reduce external part count as well as PCB space fixed output voltage variants of 2.5, 3.0 and 3.3V with ±3% accuracy are also available. From a Li-Ion battery input voltage range the AS1331 offers 300mA of output current. Combined with two small capacitors and a single chip-scale inductor the AS1331 provides a small and low profile footprint solution, typically required in battery powered applications.
austriamicrosystems' AS1331 implements a 4-switch architecture to deliver efficiencies of up to 90% while, at light loads, the quiescent current is reduced down to as low as 22µA, thereby maximizing efficiency. In shutdown mode the AS1331 fully disconnects the input from the output drawing only 100nA shutdown current which further extends
battery life time. The AS1331 additionally offers a battery monitoring circuitry which can also be used for power-ok signaling.
"In many applications output voltages are in between the input voltage range. Therefore it is a necessary requirement to maintain a constant output voltage as the battery voltage falls below the output," commented Bruce Ulrich, Marketing Director Standard Linear at austriamicrosystems. "The optimized buck-boost architecture of the
AS1331 guarantees excellent efficiencies during step-down operation as well as while boosting the input voltage. Pure buck converters stop operation as soon as the input voltage drops below the output voltage. This leaves unused charge in the battery which can be utilized by AS1331 providing up to 25% more battery life time."
To prevent excessive inrush current during startup, the AS1331 offers a soft-start feature plus additional features such as overload protection and thermal shutdown circuitry. The AS1331 is available in a small TDFN(3x3)-10 package and is suitable for operating temperatures ranging from -40 to +85°C. For product specific information, to
download data sheets or to request free samples from austriamicrosystems' online shop ICdirect, please visit http://www.austriamicrosystems.com/DC-DC/AS1331.
About austriamicrosystems
austriamicrosystems is a leading designer and manufacturer of high performance analog ICs, combining more than 25 years of analog design capabilities and system know-how with its own state-of-the-art manufacturing and test facilities. austriamicrosystems leverages its expertise in low power and high accuracy to provide industry-leading customized and standard analog products. Operating worldwide with more than 1,000 employees, austriamicrosystems focuses on the areas of power management, sensing and mobile entertainment in its markets Communications, Industry & Medical and Automotive, complemented by its Full Service Foundry activities.
austriamicrosystems is listed on the SWX Swiss Exchange in Zurich (ticker: AMS).
For further information
Press Contact
austriamicrosystems AG
Ulrike Anderwald
Marketing Communications Manager
Tel: +43 (0) 3136 500 5856
Fax: +43 (0) 3136 500 5420
press@austriamicrosystems.com
www.austriamicrosystems.com
Technical Contact
austriamicrosystems AG
Rene Wutte
Marketing Manager Standard Linear
Tel: +43 (0) 3136 500 5653
Fax: +43 (0) 3136 500 5420
rene.wutte@austriamicrosystems.com
www.austriamicrosystems.com
