1-A buck converter extends battery run-times for wearables

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By eeNews Europe

The AS1382 step-down converter operates from an input range of 2.7-5.5 V, and provides an output down to 0.6 V. Offering efficiency as high as 96% and no-load current of 95 µA, the converter helps designers of Li-ion battery powered devices to reduce losses in the power circuit and to extend their product’s run-time between charges. In shut-down mode, the device draws 0.04 µA.

Housed in a miniature 1.22 mm x 0.85 mm six-lead chip-scale package (WL-CSP6) with a 0.4 mm pitch, the AS1382 operates at an internally fixed frequency of 2 MHz, 3 MHz or 4 MHz, enabling the use of a small inductor which means that a circuit based on the AS1382 DC-DC converter is small enough to be accommodated in densely populated board designs, such as those found in mobile phones, portable media players and wearable devices.

The AS1382 is provided in variants offering a fixed output of 1.0 V, 1.2 V, 1.5 V or 1.8 V, and in a version with an output adjustable over the range 0.61-3.35 V. All support a continuous load current of 1 A, and require an output capacitor of 10 µF.

The step-down converter may be operated in one of two modes: its Low-Ripple/Low-Noise mode produces low levels of ripple and noise. In High-Efficiency mode, the device has lower power losses when supplying light loads, increasing stand-by time in always-on battery operated solutions.

The device includes an internal synchronous switch, which eliminates the need for an external Schottky diode.

Availability and Pricing

The DC-DC step-down converter AS1382 is available in production volumes now, priced at $0.21 each in quantities of 1,000 units.

An evaluation board for the AS1382 is available online from ams.


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