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1A buck converter from ams operates from 2.7V to 5.5V

Posted: 23 Apr 2015     Print Version  Bookmark and Share

Keywords:ams  buck converter  lithium-ion battery  wearable 

ams AG has unveiled a 1A synchronous step-down (buck) converter that offers a wide input voltage range, high efficiency and low stand-by current needed in designs powered by a single-cell lithium-ion battery. The AS1382 operates from an input range of 2.7V to 5.5V, and provides an output down to as little as 0.6V.

Offering efficiency as high as 96 per cent and no-load current of just 95μA, 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 just 0.04μA.

Housed in a miniature 1.22mm x 0.85mm six-lead chip-scale package (WL-CSP6) with a 0.4mm pitch, the AS1382 operates at an internally fixed frequency of 2MHz, 3MHz or 4MHz, enabling the use of a small inductor. This 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 1V, 1.2V, 1.5V or 1.8V, and in a version with an output adjustable over the range 0.61V to 3.35V. All support a continuous load current of 1A, and require an output capacitor of just 10μF.

The step-down converter may be operated in one of two modes: its low-ripple/low-noise mode produces very 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.

The DC-DC step-down converter is available in production volumes. An evaluation board for the AS1382 is available online from ams.

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