LT3045-1 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator with VIOC Control FEATURES DESCRIPTION n Ultralow RMS Noise: 0.8V (10Hz to 100kHz) The LT 3045-1 is a high performance low dropout linear RMS n Ultralow Spot Noise: 2nV/Hz at 10kHz regulator featuring LTCs ultralow noise and ultrahigh PSRR n Ultrahigh PSRR: 76dB at 1MHz architecture for powering noise sensitive applications. De- n Output Current: 500mA signed as a precision current reference followed by a high n Wide Input Voltage Range: 1.8V to 20V performance voltage buffer, the LT3045-1 can be easily n Single Capacitor Improves Noise and PSRR paralleled to further reduce noise, increase output current n 100A SET Pin Current: 1% Initial Accuracy and spread heat on the PCB. In addition to the LT3045 n VIOC Pin Controls Upstream Regulator to Minimize feature set, the LT3045-1 incorporates a VIOC tracking Power Dissipation function to control an upstream switching converter to n Single Resistor Programs Output Voltage maintain a constant voltage across the LT3045-1 and n Programmable Current Limit hence minimize power dissipation. n Low Dropout Voltage: 260mV The device supplies 500mA at a typical 260mV dropout n Output Voltage Range: 0V to 15V voltage. Operating quiescent current is nominally 2.3mA n Programmable Power Good and drops to <<1A in shutdown. The LT3045-1s wide n Fast Start-Up Capability output voltage range (0V to 15V) while maintaining unity- n Precision Enable/UVLO gain operation provides virtually constant output noise, n Parallelable for Lower Noise and Higher Current PSRR, bandwidth and load regulation, independent of the n Internal Current Limit with Foldback programmed output voltage. Additionally, the regulator n Minimum Output Capacitor: 10F Ceramic features programmable current limit, fast start-up capa- n Reverse-Battery and Reverse-Current Protection bility and programmable power good to indicate output n 12-Lead MSOP and 3mm 3mm DFN Packages voltage regulation. The LT3045-1 is stable with a minimum 10F ceramic APPLICATIONS output capacitor. Built-in protection includes reverse- n RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs battery protection, reverse-current protection, internal n Very Low Noise Instrumentation current limit with foldback and thermal limit with hysteresis. n High Speed/High Precision Data Converters The LT3045-1 is available in thermally enhanced 12-Lead n Medical Applications: Imaging, Diagnostics MSOP and 3mm 3mm DFN packages. n Post-Regulator for Switching Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. Patents pending. All other trademarks are the property of their respective owners. Noise Spectral Density TYPICAL APPLICATION 1000 0.22F LDO = 4.3V IN 2.2H LT8608 LT3045-1 IN LDO = 3.3V V IN OUT IN BST 12V I = 500mA 100 LOAD 47F 100A EN/UV SW EN/UV TR/SS PG PGFB 10 + 10nF OUT V : VARIABLE MODE OUT I : 500mA 2.21k OUT(MAX) 1 OUTS R FB VIOC T V V = 1V 40.2k LDOIN LDOUT 7.68k SET GND ILIM PG 10F INTV CC GND 0.1 30451 TA01a LDO 1F OUT LDO IN 249 Noise Floor 4.7F 0.01 f = 1MHz SW 10 100 1k 10k 100k 1M 10M L: XFL4020-222MEC FREQUENCY (Hz) 30451 TA01b 30451fa 1 For more information www.linear.com/LT3045-1 NOISE (V/Hz)LT3045-1 ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage .........................................................22V OUT Pin Voltage (Note 10) .............................0.3V, 16V VIOC Pin Voltage (Note 10) ..............................0.3V, 4V OUT-to-OUTS Differential (Note 14) ....................... 1.2V EN/UV Pin Voltage ..................................................22V IN-to-OUT Differential .............................................22V IN-to-EN/UV Differential..........................................22V IN-to-OUTS Differential ...........................................22V PG Pin Voltage (Note 10) ...............................0.3V, 22V Output Short-Circuit Duration .......................... Indefinite ILIM Pin Voltage (Note 10) ...............................0.3V, 1V Operating Junction Temperature Range (Note 9) PGFB Pin Voltage (Note 10) ...........................0.3V, 22V E-Grade, I-Grade ............................... 40C to 125C SET Pin Voltage (Note 10) ..............................0.3V, 16V Storage Temperature Range .................. 65C to 150C SET Pin Current (Note 7) .................................... 20mA Lead Temperature (Soldering, 10 Sec) OUTS Pin Voltage (Note 10) ...........................0.3V, 16V MSE Package ...................................................300C OUTS Pin Current (Note 7) ................................. 20mA PIN CONFIGURATION TOP VIEW TOP VIEW 1 12 OUT IN IN 1 12 OUT 2 IN 11 OUT IN 2 11 OUT 3 VIOC 13 10 OUTS VIOC 3 13 10 OUTS GND GND EN/UV 4 9 GND 4 9 GND EN/UV PG 5 8 SET 5 8 SET PG ILIM 6 7 PGFB 6 7 ILIM PGFB MSE PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 12-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 33C/W, = 8C/W JMAX JA JC T = 150C, = 34C/W, = 5.5C/W JMAX JA JC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION