High-Efficiency 3A Step-Down Converter

Sept. 19, 2011
Austriamicrosystems has announced the AS1328 high-efficiency 1.5 MHz synchronous DC-DC step-down converter.

Austriamicrosystems AS1328 DC-DC can deliver up to 3A of output current at output voltages as low as 0.6 V while operating from an input voltage of 2.7 to 5.5 V over a -40°C to 85°C temperature range. Fixed-output voltage versions are available in 50 mV increments or, alternatively, the output voltage can be set from 0.6 V to the input voltage via an external resistor divider. In addition, the AS1328 buck converter incorporates a Softstart feature that minimizes the initial inrush current and is available with a "power okay" function or "low battery" detection signal. This buck regulator features efficiencies up to 96%, excellent light load efficiencies and with a quiescent current of only 25 µA.

Valuable board space is conserved by incorporating internal compensation components as well as two switches with RDSon of only 35 mOhm. Housed in a tiny 3 x 3 mm TQFN package, the AS1328 buck regulator features a high fixed switching frequency of 1.5 MHz, allowing the use of small surface mount inductors.

The input voltage range of the AS1328 DC-DC step-down converter makes it well suited for applications powered by a single Li-Ion battery, while its small footprint enables the AS1328 to be used in portable devices such as medical instruments, mobile internet devices and tablet PCs. Applications requiring high currents are also targets for the AS1328, including solid state drives, set top boxes, base stations, telecom and network equipment, FPGA, DDR, and µP cores supplies.

The AS1328 high-efficiency 3A step-down converter is available now and is priced at $1.30 in 1000 piece quantities.

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