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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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 Images