Low-Noise LDO Regulator Provides Whisper-Quiet Voltage For RF Signal Chains

    Sept. 15, 2005
    LOW-NOISE AMPLIFIERS, VOLTAGE-CONTROLLED OSCILLATORS, and other RF chips can take advantage of National Semiconductor's LP5900. This 100-mA, lowdropout (80 mV) linear regulator offers a 6.5-µV rms noise spec and a 75-dB power-supply rejection ratio

    LOW-NOISE AMPLIFIERS, VOLTAGE-CONTROLLED OSCILLATORS, and other RF chips can take advantage of National Semiconductor's LP5900. This 100-mA, lowdropout (80 mV) linear regulator offers a 6.5-µV rms noise spec and a 75-dB power-supply rejection ratio. Its patentpending architecture achieves this performance without a bypass capacitor. All it needs is a 0.47-µF ceramic on the input and a 0.47- to 10-µF ceramic on the output. Standard output voltages are 1.5, 1.8, 2.0, 2.2, 2.5, 2.8, 3.0, and 3.3 V. Quiescent current is 25 µA. The package measures 1.1 by 1.1 mm. Unit pricing is $0.55 each in 1000-unit quantities

    National Semiconductor
    www.national.com

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