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Power/Alternative Energy??

LDOs promise 'outstanding' noise performance

Posted: 27 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:noise performance? LDO chips? low noise?

AS1358/59/61/62

austriamicrosystems has expanded its LDO portfolio with the AS1358/59/61/62 family, which promises noise performance of less than 9?Vrms and up to 92dB PSRR (@1kHz typ).

The new product family, operating from a 2-5.5V supply, is the highly suitable for applications powered by dual or triple standard-cell and a single Li-ion battery. With a dropout voltage of 70mV typ @150mA and 140mV typ @300mA (AS1359/62 only) at a current of 40?A typ during operation and 9nA typ during shutdown, battery life time can be maximized using these new ultralow-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 for 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 preprogrammed output voltages in the range of 1.4-4.5V with an output voltage accuracy of 1 percent (@ 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 300?s allows system-level dynamic power management. Furthermore, the devices offer overtemperature and overcurrent protection. With the choice of between 150mA (AS1358/61) and 300mA (AS1359/62) output current, the new ultralow-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 -40C to 85C.




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