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Dual dc-dc converters offer maximum efficiency

Dual dc-dc converters offer maximum efficiency

austriamicrosystems introduces what they say are "the industry’s highest efficiency high current, dual step-down dc-dc converters" in a compact 3 x 3-mm TDFN package. For space-limited applications with low power consumption requirements, the new AS134x series provides small size and high efficiency (up to 95%) for maximum time between battery charges. The AS134x series is targeted for portable devices such as laptops, PDAs, mobile Internet devices, and solid state drives (SSDs).

The AS1346/47/48/49 dc-dc series is a family of high-efficiency, constant-frequency dual buck converters available with fixed-voltage versions in 100 mV increments from 1.2 to 3.6 V. Each version provides two independent dc-dc regulators with output currents between 0.5 and 1.2 A.

The two channels operate 180° out-of-phase to reduce input voltage ripple and minimize input capacitor requirements. The devices operate over a broad input voltage range (2.7 to 5.5 V), feature an automatic power-save mode, and, with internal MOSFETs, few external components are required. These features and others make the AS134x series well suited for SSDs and many other battery-powered products.

In shutdown mode, typical supply current decreases to ≤1 μA. In addition, a highly efficient duty cycle provides low dropout operation, prolonging battery life in portable systems while an internal synchronous switching scheme increases efficiency and eliminates the need for an external Schottky diode. The internally fixed switching frequency (2.0 MHz) allows the use of small surface mount inductors.

For more information, contact austriamicrosystems USA Inc., 5201 Great America Parkway, Suite 320, Santa Clara, CA 95054. Phone: 408-345-1790.

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