LT3042EDD Ultra-Low Noise LDO 0.8μV RMS Noise 76dB PSRR @1MHz 1.8-20V Input 3mm×3mm DFN-8 -40°C to +125°C

LT3042EDD Ultra-Low Noise LDO 0.8andmu;V RMS Noise 76dB PSRR @1MHz 1.8-20V Input 3mmandtimes;3mm DFN-8 -40anddeg;C to +125anddeg;C

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FEATURES

andnbsp;Ultralow RMS Noise: 0.8andmicro;VRMS (10Hz to 100kHz)

andnbsp;Ultralow Spot Noise: 2nV/andradic;Hz at 10kHz

andnbsp;Ultrahigh PSRR: 79dB at 1MHz

andnbsp;Output Current: 200mA

andnbsp;Wide Input Voltage Range: 1.8V to 20V

andnbsp;Single Capacitor Improves Noise and PSRR

andnbsp;100andmicro;A SET Pin Current: andplusmn;1% Initial Accuracy

andnbsp;Single Resistor Programs Output Voltage

andnbsp;High Bandwidth: 1MHz

andnbsp;Programmable Current Limit

andnbsp;Low Dropout Voltage: 350mV

andnbsp;Output Voltage Range: 0V to 15V

andnbsp;Programmable Power Good

andnbsp;Fast Start-Up Capability

andnbsp;Precision Enable/UVLO

andnbsp;Parallelable for Lower Noise and Higher Current

andnbsp;Internal Current Limit with Foldback

andnbsp;Minimum Output Capacitor: 4.7andmicro;F Ceramic

andnbsp;Reverse Battery and Reverse Current Protection

n 10-Lead MSOP and 3mm andtimes; 3mm DFN Packages

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APPLICATIONS

andnbsp;RF Power Supplies: PLLs, VCOs, Mixers, LNAs

andnbsp;Very Low Noise Instrumentation

andnbsp;High Speed/High Precision Data Converters

andnbsp;Medical Applications: Imaging, Diagnostics

andnbsp;Precision Power Supplies

andnbsp;Post-Regulator for Switching Supplies

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DESCRIPTION

The LTandreg;3042 is a high performance low dropout linear regulator featuring LTCandrsquo;s ultralow noise and ultrahigh PSRR architecture for powering noise sensitive RF applications. Designed as a precision current reference followed by a high performance voltage buffer, the LT3042 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB.

The device supplies 200mA at a typical 350mV dropout voltage. Operating quiescent current is nominally 2mA and drops to andlt;andlt;1andmicro;A in shutdown. The LT3042andrsquo;s wide output voltage range (0V to 15V) while maintaining unity gain operation provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capa bility and programmable power good to indicate output voltage regulation.

The LT3042 is stable with a minimum 4.7andmicro;F ceramic output capacitor. Built-in protection includes reverse bat tery protection, reverse current protection, internal current limit with foldback and thermal limit with hysteresis. The LT3042 is available in thermally enhanced 10-Lead MSOP and 3mm andtimes; 3mm DFN packages.

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INFORMATION

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Drawing

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