Longer run-times in view for single-cell li-ion battery applications as ams launches 96%-efficient 1A buck converter
April 22 2015 - 3:41AM
Business Wire
New AS1382’s tiny footprint and 4MHz switching frequency
enable implementation of very small power circuits in mobile phones
and wearables
ams AG (SIX: AMS), a leading provider of high performance
sensors and analog ICs, today introduced a 1A synchronous buck
converter with the wide input voltage range, high efficiency and
low stand-by current required in designs powered by a single-cell
lithium-ion battery.
The new AS1382 step-down converter operates from an input range
of 2.7-5.5V, and provides an output down to as little as 0.6V.
Offering efficiency as high as 96% 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
1.0V, 1.2V, 1.5V or 1.8V, and in a version with an output
adjustable over the range 0.61-3.35V. 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 synchronous converters used in portable and battery-powered
products continue to yield opportunities for reducing power losses.
Designers who can make use of the AS1382’s 96% peak efficiency and
extremely low stand-by current will find they can gain worthwhile
extra run-time out of their product’s li-ion battery system,’ said
Bernd Krafthoefer, product marketing manager at ams AG.
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.
For more information and sample requests, go to
www.ams.com/step-down-converter/AS1382.
Download press picture and block diagram at
http://www.ams.com/eng/Press/Press-Releases/
ams AGPatricia MoosburgerMedia Relationsphone: +43 (0) 3136 500
31235press@ams.comwww.ams.com
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