High-Efficiency 3

altA Step-Down Converter austriamicrosystems (Unterpremstaetten, Austria) has released the AS1328 high-efficiency 1.5 MHz synchronous DC-DC step-down converter. This buck regulator features efficiencies up to 96%, excellent light load efficiencies, and a quiescent current of 25 μA. The AS1328 DC-DC delivers 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. 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.

Board space is conserved by incorporating internal compensation components as well as two switches with RDSon of only 35 mOhm. Housed in a 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.