A family of constant-frequency dual buck converters from austriamicrosystems are available in a 3x3mm TDFN package.

With specified efficiency up to 95%, the AS1346/47/48/49 DC-DC series is available with fixed-voltage versions in 100mV increments from 1.2V to 3.6V.

Each version provides two independent DC-DC regulators with output currents between 0.5A and 1.2A.

The two channels operate 180 degrees out-of-phase to reduce input voltage ripple and minimise input capacitor requirements.

The devices operate over a broad input voltage range (2.7 V to 5.5 V), feature an automatic power-save mode, and, with internal mosfets, few external components are required.

In shutdown mode, typical supply current decreases to 1µA.

The duty cycle is designed to provide 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.

The AS134x DC-DC converters operate from a 2.7 to 5.5V power supply, and has an ambient operating temperature range of -40 to +85°C.

For more information, see http://www.austriamicrosystems.com/DC-DC