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Ultralow-dropout regulator guarantees 200mA output

Posted: 17 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:ultralow dropout regulator? space critical applications? mobile phones? PDAs? limited PCB space?

An ultralow-dropout regulator with a guaranteed 200mA output current has been launched by austriamicrosystems for space critical applications such as mobile phones and PDAs that require high performance despite limited PCB space.

The AS1369 has an operating input voltage between 2V and 5.5V, and is ideal for dual or triple standard-cell and single cell Li-ion battery powered applications and is available in a variety of pre-programmed output voltages from 1.2V to 5V. The output voltage is regulated with an accuracy of 0.7 percent which meets the requirements of today's portable battery-powered products. With a low dropout voltage of 40mV at 100mA , 80mV at 200mA , an extremely low quiescent current of only 25?A during operation and an exceptional 5nA during shutdown, battery life time is maximized.

Space, other specs

"austriamicrosystems' AS1369 fulfills the requirements of slim and compact modern designs where PCB space is very limited and must be used efficiently. Improved performance and maximized battery lifetime are the additional benefits of this LDO," said Walter Moshammer, marketing director Standard Linear at austriamicrosystems. "With only 1mm? PCB space required and the ability to work with the smallest sized capacitors, the AS1369 offers superior performance for all space sensitive applications."

The AS1369 allows the use of a small 1?F ceramic output capacitor and features a PSRR performance of 80dB at 1kHz and 56dB at 100kHz. No external bypass capacitor is needed and, combined with the exceptional low noise performance of only 30?Vrms between 400Hz and 80kHz, the AS1369 is ideally suited for noise sensitive wireless and RF applications.

A digital enable input with a turn-on time of only 30?s allows dynamic power management in a system. In addition, the AS1369 offers over-temperature and over-current protection. The 4-bump WL-CSP package with dimensions of only 1mm? is 9 times smaller than a standard SOT23 package.

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