Low-noise linear regulator powers analog, RF ICs

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.