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Regulator powers analog, RF ICs

Posted: 12 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:lp5900? linear regulator? national semiconductor?

Designed as a low drop-out linear regulator optimized for powering 100mA analog and RF signal-path ICs, including low-noise amplifiers, voltage-controlled oscillators and RF receivers in cellphones and similar portable devices, the LP5900 CMOS linear regulator from National Semiconductor Corp. offers ultra-low noise, and high power supply ripple rejection, while consuming a mere 25?A.

The LP5900 linear regulator only emits 6.5?VRMS of noise and features a high power supply rejection ratio (PSRR) of 75dB without the need for a bypass capacitor. It offers a low voltage dropout of 80mV, a start up time of approximately 150?s, and a range of output voltages with an output voltage accuracy of 2 percent across the full line/load/temperature specifications (-40C to 125C). The LP5900 is available in multiple output voltages ranging from 1.5V to 3.3V, including 1.5-, 1.8-, 2-, 2.2-, 2.5-, 2.8-, 3- and 3.3V. Other voltage options are available.

The regulator consumes limited board space, comes in a lead-free micro SMD-4 bump package (1.1-by-1.1mm) and includes thermal-overload and short-circuit protection. When combined with two 0.47?F ceramic capacitors, the manufacturer claims that it is the smallest solution available today.

Available now, the LP5900 linear regulator is priced at 55 cents in quantities of 1,000 or more. A 6-lead leadless leadframe package is expected later this year.

- Winn Hardin


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