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

FEATURES

 Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz)

 Ultralow Spot Noise: 2nV/√Hz at 10kHz

 Ultrahigh PSRR: 79dB at 1MHz

 Output Current: 200mA

 Wide Input Voltage Range: 1.8V to 20V

 Single Capacitor Improves Noise and PSRR

 100µA SET Pin Current: ±1% Initial Accuracy

 Single Resistor Programs Output Voltage

 High Bandwidth: 1MHz

 Programmable Current Limit

 Low Dropout Voltage: 350mV

 Output Voltage Range: 0V to 15V

 Programmable Power Good

 Fast Start-Up Capability

 Precision Enable/UVLO

 Parallelable for Lower Noise and Higher Current

 Internal Current Limit with Foldback

 Minimum Output Capacitor: 4.7µF Ceramic

 Reverse Battery and Reverse Current Protection

n 10-Lead MSOP and 3mm × 3mm DFN Packages

APPLICATIONS

 RF Power Supplies: PLLs, VCOs, Mixers, LNAs

 Very Low Noise Instrumentation

 High Speed/High Precision Data Converters

 Medical Applications: Imaging, Diagnostics

 Precision Power Supplies

 Post-Regulator for Switching Supplies

DESCRIPTION

The LT®3042 is a high performance low dropout linear regulator featuring LTC’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 <<1µA in shutdown. The LT3042’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 4.7µF 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 × 3mm DFN packages.

INFORMATION

Drawing

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