LT3040 20V, 200mA, Ultralow Noise, Ultrahigh PSRR Precision DAC/Reference Buffer FEATURES DESCRIPTION n Ultralow Wideband Noise: 1.2V (10Hz to The LT 3040 is a high performance, robust Voltage Output RMS 100kHz) Reference/DAC buffer that employs a unique architecture n Ultralow 1/f Noise: 0.6V (0.1Hz to 10Hz) that seeks to maintain the precision and accuracy of the P-P n Ultralow Spot Noise: 4nV/Hz at 1kHz and Above Reference or DAC while sourcing up to 200mA. It fea- n Ultrahigh PSRR: 73dB at 1MHz tures ADIs ultralow noise and ultrahigh PSRR architec- n Ultralow Input Offset: 125V ture for powering noise sensitive, high accuracy systems. n Output Source Current: 200mA Designed as an advanced voltage buffer for Voltage Output n Wide Input Voltage Range: 1.8V to 20V References/DACs, the LT3040 features extremely low 1/f n Rail to Rail Output Voltage Range: 0V to 15V noise, very low wideband noise, excellent PSRR over a n Single Capacitor Improves Noise and PSRR wide frequency range and low dropout performance a n Fast Start-Up for V Pin typical 350mV dropout at 200mA of source current. IN n FAULT Flag Operating quiescent current is nominally 2.5mA and drops n High Bandwidth: 1MHz to <1A in shutdown. The LT3040s wide output voltage n Low Dropout Voltage: 350mV range (0V to 15V) while maintaining unity-gain operation n Programmable Current Limit provides virtually constant output noise, PSRR, bandwidth n Precision Enable/UVLO and load regulation independent of the V voltage. Ad- IN n Parallelable for Lower Noise and Higher Current ditionally, the buffer features programmable current limit, n Internal Current Limit with Foldback fast start capability and a FAULT flag to indicate faults on n Minimum Output Capacitor: 4.7F Ceramic the output. n Reverse Supply and Reverse Current Protection n The LT3040 is stable with a minimum 4.7F ceramic output Thermal Limit with Hysteresis n capacitor. Built-in protection includes reverse supply volt- 10-Lead 3mm 3mm DFN and 12-Lead MSOP age protection, reverse current protection, internal current limit with fold-back and thermal limit with hysteresis. The APPLICATIONS LT3040 is available in thermally enhanced 12-Lead MSOP n High Speed/High Precision Data Converters and 10-Lead 3mm 3mm DFN packages. n High Precision Voltage References All registered trademarks and trademarks are the property of their respective owners. n Very Low Noise Instrumentation TYPICAL APPLICATION Power Supply Ripple Rejection + 120 V LTC66552.5 OUTPUT 5V 5% C + V R FAULT 110 LT3040 OUTPUT 4.7F 200k + LT3040 100 FAULT EN/UV V LTC6655-3.3 90 IN OUT F FS C REF R 80 SHDN OUT S IN 2.2F QPWR 5k V IN GND 70 + OUT V = 3.3V QDRV OUT 60 I = 200mA C OUT(MAX) IN + V 2.2F FB 50 V = 4.5V R = 5k IN GND ILIM 40 C = 4.7F IN C = 4.7F 30 OUT C OUT I = 200mA R LOAD ILIM 4.7F 20 499 10 100 1k 10k 100k 3040 TA01a FREQUENCY (Hz) 3040 TA01b Rev. 0Rev. 0 1 Document Feedback For more information www.analog.com PSRR (dB)LT3040 ABSOLUTE MAXIMUM RATINGS (Note 1) + V Pin Voltage ....................................................... 22V OUT-to-V Differential (Note 14) ......................... 1.2V FB + EN/UV Pin Voltage ................................................ 22V V -to-OUT Differential ........................................... 22V + + V -to-EN/UV Differential Voltage ........................... 22V V -to-V Differential ............................................ 22V FB FAULT Pin Voltage (Note 10) ..........................0.3V, 22V FS Pin Voltage (Note 10) .............................. 0.3V, 16V ILIM Pin Voltage (Note 10) ............................. 0.3V, 1V Output Short-Circuit Duration ........................ Indefinite V Pin Voltage (Note 10) ............................. 0.3V, 16V Operating Junction Temperature Range (Note 9) IN V Pin Current (Note 7) .................................... 20mA E-Grade, I-Grade .............................. 40C to 125C IN V Pin Voltage (Note 10) ............................ 0.3V, 16V Storage Temperature Range ................ 65C to 150C FB V Pin Current (Note 7) ................................... 20mA Lead Temperature (Soldering, 10 sec) FB OUT Pin Voltage (Note 10) ........................... 0.3V, 16V MSE Package .................................................. 300C PIN CONFIGURATION TOP VIEW TOP VIEW + + 1 12 OUT V 1 10 OUT V + + V 2 11 OUT V 2 9 V FB + V 3 10 V FB EN/UV 3 8 GND EN/UV 4 9 GND FAULT 4 7 V IN FAULT 5 8 V IN ILIM 6 7 FS ILIM 5 6 FS MSE PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 28C/W, = 6C/W JMAX JA JC T = 125C, = 43C/W, = 5.5C/W JMAX JA JC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3040EMSE PBF LT3040EMSE TRPBF 3040 12-Lead Plastic MSOP 40C to 125C LT3040IMSE PBF LT3040IMSE TRPBF 3040 12-Lead Plastic MSOP 40C to 125C LT3040EDD PBF LT3040EDD TRPBF LHGM 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3040IDD PBF LT3040IDD TRPBF LHGM 10-Lead (3mm 3mm) Plastic DFN 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev. 0 2 For more information www.analog.com