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Low-noise linear regulator powers analog, RF ICs

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

The LP5900 linear regulator only emits 6.5 microVRMS of noise and features a high power supply rejection ratio (PSRR) of 75 dB without the need for a bypass capacitor. It offers a low voltage dropout of 80mV, a start up time of approximately 150 microseconds, and a range of output voltages with an output voltage accuracy of +/-2% across the full line/load/temperature specifications (-40 degrees C to +125 degrees C). The LP5900 is available in multiple output voltages ranging from 1.5V to 3.3V, including 1.5V, 1.8V, 2.0V, 2.2V, 2.5V, 2.8V, 3.0V and 3.3V. Other voltage options are available.

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

Available now, the LP5900 linear regulator is priced at $0.55 in quantities of 1,000 or more. A 6-lead leadless leadframe package is expected later this year. Click here for the data sheet.

National Semiconductor Corporation, +1 800-272-9959, http://power.national.com.

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