LT3094 Datasheet | Analog Devices

FEATURES n Ultralow RMS Noise: 0.8µVRMS (10Hz to 100k Hz) n Ultralow Spot Noise: 2.2n V/√Hz at 10k Hz n Ultrahigh PSRR: 74d B at 1MHz n Output Current: 500m A n Wide Input Voltage Range: - 1.8V to - 20V n Single Capacitor Improves Noise and PSRR n 100µA SET Pin Current: ±1% Initial Accuracy n Single Resistor Programs Output Voltage n Programmable Current Limit n Low Dropout Voltage: 235m V n Output Voltage Range: 0V to - 19.5V n Programmable Power Good and Fast Start-Up n Bipolar Precision Enable/UVLO Pin n VIOC Pin Controls Upstream Regulator to Minimize Power Dissipation and Optimize PSRR n Minimum Output Capacitor: 10µF Ceramic n 12-Lead MSOP and 3mm × 3mm DFN Packages APPLICATIONS n RF and Precision Power Supplies n Very Low Noise Instrumentation n High Speed/High Precision Data Converters n Medical Applications: Diagnostics and Imaging n Post-Regulator for Switching Supplies - 20V, 500m A, Ultralow Noise, Ultrahigh PSRR Negative Linear Regulator DESCRIPTION The LT®3094 is a high performance low dropout negative linear regulator featuring ADI’s ultralow noise and ultrahigh PSRR architecture for powering noise sensitive applications. The device can be easily paralleled to further reduce noise, increase output current and spread heat on a PCB. The LT3094 supplies 500m A at a typical 235m V dropout voltage. Operating quiescent current is nominally 2.35m A and drops to 3µA in shutdown. The device’s wide output voltage range (0V to - 19.5V) error amplifier operates in unity-gain and provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additional features are a bipolar enable pin, programmable current limit, fast startup capability and programmable power good to indicate output voltage regulation. The regulator incorporates a tracking function to control an upstream supply to maintain a constant voltage across the LT3094 to minimize power dissipation and optimize PSRR. The LT3094 is stable with a...