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austriamicrosystems unveils ultra low-noise 300mA LDO

Posted: 26 Nov 2007     Print Version  Bookmark and Share

Keywords:low dropout voltage; noise performance; PA bias supplies 

AS1358/59/61/62 family

austriamicrosystems has expanded its low dropout regulator (LDO) portfolio with the AS1358/59/61/62 family optimised to deliver noise performance of less than 9?VRMS and up to 92dB PSRR (@ 1kHz typ). With this new product family, austriamicrosystems offers the highest performing LDOs in their class on the market, claims the company.

The AS1358/59/61/62 family, operating from a 2 to 5.5V supply, is the perfect LDO for dual or triple standard-cell and single Li-Ion battery powered applications. With a low dropout voltage of 70mV typ @ 150mA and 140mV typ @ 300mA (AS1359/62 only) at low current of only 40?A typ during operation and stunning 9nA typ during shutdown, battery life time can be maximised using these new ultra-low-noise ICs.

"AS1358/59/61/62 are the LDOs of choice for powering circuits that require a low-noise supply, such as RF, cellphone cameras, wireless base stations and PA bias supplies", said Walter Moshammer, marketing director, Standard Linear at austriamicrosystems. "Offering low dropout voltage as well as low quiescent current, this ultralow-noise LDO family is ideally suited for any battery-powered device."

The AS1358/59/61/62 family offers pre-programmed output voltages in the range between 1.4 to 4.5V with an output voltage accuracy of excellent one per cent (@ 300mA). An additional feature of the AS1361/62 is a power-ok output that signals when the output voltage drops out of regulation.

A digital enabled pin with a turn-on time of only 300?s allows system-level dynamic power management. Furthermore, the devices offer over-temperature and over-current protection. With the choice of between 150mA (AS1358/61) and 300mA (AS1359/62) output current, the new ultra-low-noise LDO family delivers sufficient power for a wide range of applications.

The AS1358/59 are available in a 5-pin TSOT23 package and the AS1361/62 are available in a 6-pin TSOT23 package, both suitable for operating environments ranging from -40 to +85°C.

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