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LDO regulator offers best quiescent current, regulator performance compromise

Posted: 30 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:austriamicrosystems? as1352? quad cmos? low dropout voltage regulator? ldo regulator?

austriamicrosystems AG has rolled out a new high-performance programmable quad CMOS low dropout (LDO) voltage regulator in a single 4-by-4mm package.

According to the company, the AS1352's programmable regulators have been optimized to deliver the best compromise between quiescent current and regulator performance for mobile phones, PDAs, MP3 players and other battery-powered devices.

The one-time programmable (OTP) function of the device provides a high degree of design flexibility by allowing engineers to program the output voltage for each regulator on-site in the range from 1.8V to 3.3V in steps of 100mV, said the press release. This allows for fast prototyping as well as full-production ramp up, it added. In addition, the regulator offers better than 2 percent accuracy of the output voltage and output currents of 200mA for each LDO.

austriamicro shared that stability is guaranteed with ceramic output capacitors of only 1?F (20 percent-X5R) up to 4.7?F (20 percent-X5R). The low equivalent series resistance of these capacitors ensures low output impedance at high frequencies.

"Regulation performance of the AS1352 is excellent even under low dropout conditions when the power transistor has to operate in linear mode," added Walter Moshammer, marketing director for the company's communications business unit. "The low-noise performance of 40?Vrms at 10Hz to 100Hz bandwidth allows direct connection of noise-sensitive circuits without additional filtering networks."

The AS1352 is available in 12-pin QFN 4-by-4mm or in wafer bumping packaging. Standalone demonstration boards for the product are also available.

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