LT3094 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Negative Linear Regulator FEATURES DESCRIPTION n Ultralow RMS Noise: 0.8V (10Hz to 100kHz) The LT 3094 is a high performance low dropout negative RMS n Ultralow Spot Noise: 2.2nV/Hz at 10kHz linear regulator featuring ADIs ultralow noise and ultrahigh n Ultrahigh PSRR: 74dB at 1MHz PSRR architecture for powering noise sensitive applica- n tions. The device can be easily paralleled to further reduce Output Current: 500mA n noise, increase output current and spread heat on a PCB. Wide Input Voltage Range: 1.8V to 20V n Single Capacitor Improves Noise and PSRR The LT3094 supplies 500mA at a typical 235mV dropout n 100A SET Pin Current: 1% Initial Accuracy voltage. Operating quiescent current is nominally 2.35mA n Single Resistor Programs Output Voltage and drops to 3A in shutdown. The devices wide output n Programmable Current Limit voltage range (0V to 19.5V) error amplifier operates in n Low Dropout Voltage: 235mV 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: 10F Ceramic tracking function to control an upstream supply to maintain n 12-Lead MSOP and 3mm 3mm DFN Packages a constant voltage across the LT3094 to minimize power dissipation and optimize PSRR. APPLICATIONS The LT3094 is stable with a minimum 10F ceramic out- put capacitor. Built-in protection includes internal current n RF and Precision Power Supplies limit with foldback and thermal limit with hysteresis. The n Very Low Noise Instrumentation LT3094 is available in thermally enhanced 12-Lead MSOP n High Speed/High Precision Data Converters and 3mm 3mm DFN Packages. n Medical Applications: Diagnostics and Imaging All registered trademarks and trademarks are the property of their respective owners. n Post-Regulator for Switching Supplies TYPICAL APPLICATION Power Supply Ripple Rejection 120 50k 4.7F 33.2k 7.5k 105 3.3V 90 450k SET GND I PGFB 75 LIM 200k OUTS 10F 60 V OUT PG OUT 3.3V + 45 I OUT(MAX) 500mA V = 5V IN 30 R = 33.2k SET EN/UV C = 10F OUT 15 C = 4.7F SET I = 500mA L 10F 0 10 100 1k 10k 100k 1M 10M IN V IN FREQUENCY (Hz) 5V 3094 TA01b 3094 TA01a PIN NOT USED IN THIS CIRCUIT: VIOC Rev. B 1 Document Feedback For more information www.analog.com LT3094 100A PSRR (dB)LT3094 TABLE OF CONTENTS Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Pin Configuration ................................................................................................................. 3 Order Information ................................................................................................................. 4 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .......................................................................................... 7 Pin Functions .....................................................................................................................15 Block Diagram ....................................................................................................................16 Applications Information .......................................................................................................17 Typical Applications .............................................................................................................29 Package Description ............................................................................................................31 Revision History .................................................................................................................33 Typical Application ..............................................................................................................34 Related Parts .....................................................................................................................34 Rev. B 2 For more information www.analog.com