austriamicrosystems Expands Portfolio of High Efficiency Step-up dc-dc Converters for Battery Powered Products

austriamicrosystems AG announced the expansion of its family of step-up dc-dc converters with the introduction of the AS1325, a high efficiency step-up dc-dc converter with a fully integrated synchronous rectifier. With an efficiency of 96%, the AS1325 is a solution well-suited for battery powered portable applications with the need for 3.3V or 5.0V supply voltage.

Improving on the performance of the company's AS1320 and AS1321 dc-dc converters, the AS1325 offers significantly increased output current, providing a supply voltage of 1.5 to 3.5V (for 3.3V output voltage) or 1.5 to 5.0V (for 5.0V output voltage). Supplied with less than 2V, the AS1325 is capable of delivering a 300mA output current at 5.0V output voltage or 185mA at 3.3V output voltage.

The AS1325 features a shutdown mode where it draws less than 1(mu)A. In this mode, the battery is connected directly to the output to enable direct battery feed-through. This enables the input battery to be used as backup or as a real-time clock supply when the converter is off and eliminates the need for an expensive back-up battery. To ensure stable operation, the integrated "power on" reset circuitry enables the AS1325 to reset any type of microprocessor after power up to provide a stable start.

"The high output current combined with low power consumption and high efficiency makes the AS1325 an ideal solution for battery powered devices like medical and diagnostics equipment, digital cameras, MP3 players, PDAs and smart phones, cordless phones and other handheld products," said Walter Moshammer, standard linear marketing director at austriamicrosystems. "The outstanding efficiency of 96 percent helps to significantly extend the battery life of dual-cell battery powered devices."

The AS1325 is available in a 6-pin SOT23 package.