Datasheet LT3093 (Analog Devices)

LT3093 –20V, 200mA, Ultralow Noise, Ultrahigh PSRR Negative Linear Regulator
FEATURES DESCRIPTION
n
Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz)
The LT®3093 is a high performance low dropout negative n
Ultralow Spot Noise: 2.2nV/√Hz at 10kHz
linear regulator featuring ADI’s ultralow noise and ultrahigh n
Ultrahigh PSRR: 73dB at 1MHz
PSRR architecture for powering noise sensitive applica- n
Output Current: 200mA
tions. The device can be easily paralleled to further reduce n
Wide Input Voltage Range: –1.8V to –20V
noise, increase output current and spread heat on a PCB. n
Single Capacitor Improves Noise and PSRR
The LT3093 supplies 200mA at a typical 190mV dropout n
100µA SET Pin Current: ±1% Initial Accuracy
voltage. Operating quiescent current is nominally 2.35mA n Single Resistor Programs Output Voltage and drops to 3µA in shutdown. The device’s wide output n Programmable Current Limit voltage range (0V to –19.5V) error amplifier operates in n Low Dropout Voltage: 190mV unity-gain and provides virtually constant output noise, n Output Voltage Range: 0V to –19.5V PSRR, bandwidth, and load regulation independent of n Programmable Power Good and Fast Start-Up the programmed output voltage. Additional features are a n Bipolar Precision Enable/UVLO Pin bipolar enable pin, programmable current limit, fast start- n VIOC Pin Controls Upstream Regulator to Minimize up capability and programmable power good to indicate Power Dissipation and Optimize PSRR output voltage regulation. The regulator incorporates a n Minimum Output Capacitor: 4.7µF Ceramic tracking function to control an upstream supply to main- n 12-Lead MSOP and 3mm × 3mm DFN Packages tain a constant voltage across the LT3093 to minimize power dissipation and optimize PSRR.
APPLICATIONS
The LT3093 is stable with a minimum 4.7µF ceramic out- n RF and Precision Power Supplies put capacitor. Built-in protection includes internal current n Very Low Noise Instrumentation limit with foldback and thermal limit with hysteresis. The n High Speed/High Precision Data Converters LT3093 is available in thermally enhanced 12-Lead MSOP n and 3mm × 3mm DFN Packages. Medical Applications: Diagnostics and Imaging n Post-Regulator for Switching Supplies All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Power Supply Ripple Rejection
4.7µF 33.2k 50k 9.76k 120 3.3V 105 450k LT3093 SET GND I 90 LIM PGFB 200k OUTS 4.7µF V 75 OUT PG + OUT –3.3V I 60 OUT(MAX) –200mA PSRR (dB) 45 EN/UV – VIN = –5V 30 RSET = 33.2k COUT = 4.7µF 4.7µF 100µA 15 CSET = 4.7µF IN I V L = –200mA IN 0 –5V 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 3093 TA01a PIN NOT USED IN THIS CIRCUIT: VIOC 3093 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Application Package Description Typical Application Related Parts