30mA output from small boost converter

austriamicrosystems has expanded its inductorless boost converter portfolio with the AS1302, an inductorless DC-DC boost converter that suits very space-constrained applications that need high efficiency. The AS1302 is capable of output currents as high as 30mA from an input range of 2.9 to 5.15V.

The AS1302 offers low-noise constant frequency operation from light to higher loads. Its constant-frequency architecture provides both low input and low output ripple and a 1.2MHz switching frequency allows the use of extremely small external capacitors. To improve efficiency the frequency is reduced to 49kHz during light loads. The AS1302 requires only two 220nF flying caps and two 2.2uF bypass capacitors. Combined with the small size of the WL-CSP-8 package, this creates an extremely compact solution for space-constrained applications.

Providing a regulated output, the AS1302 is ideally suited for a variety of applications such as 2-3 AA cells alkaline/NiMH or 1 cell Li-Ion battery to 5V boost conversion in portable devices. Boasting an efficiency of up to 99% in 1:1 mode and up to 90% in 1:2 or 2:3 mode, the AS1302 offers lowest quiescent current and features a 10nA shutdown mode in which the output is fully disconnected from the input.

To prevent excessive inrush current during startup, the AS1302 offers a soft-start mode, and features such as overload protection and thermal shutdown circuitry. The AS1302 is available in a 1.2×1.2mm WL-CSP 8-bump package and is suitable for operating environments ranging from -40 to +85°C.

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