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LT3085 Datasheet(PDF) 1 Page - Linear Technology |
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LT3085 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LT3045-1 1 30451fa For more information www.linear.com/LT3045-1 TYPICAL APPLICATION FEATURES DESCRIPTION 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator with VIOC Control The LT®3045-1 is a high performance low dropout linear regulatorfeaturingLTC’sultralownoiseandultrahighPSRR architectureforpoweringnoisesensitiveapplications.De- signed as a precision current reference followed by a high performance voltage buffer, the LT3045-1 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB. In addition to the LT3045 feature set, the LT3045-1 incorporates a VIOC tracking function to control an upstream switching converter to maintain a constant voltage across the LT3045-1 and hence minimize power dissipation. The device supplies 500mA at a typical 260mV dropout voltage. Operating quiescent current is nominally 2.3mA and drops to <<1µA in shutdown. The LT3045-1’s wide output voltage range (0V to 15V) while maintaining unity- gain operation provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capa- bility and programmable power good to indicate output voltage regulation. The LT3045-1 is stable with a minimum 10µF ceramic output capacitor. Built-in protection includes reverse- battery protection, reverse-current protection, internal currentlimitwithfoldbackandthermallimitwithhysteresis. The LT3045-1 is available in thermally enhanced 12-Lead MSOP and 3mm × 3mm DFN packages. Noise Spectral Density APPLICATIONS n Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz) n Ultralow Spot Noise: 2nV/√Hz at 10kHz n Ultrahigh PSRR: 76dB at 1MHz n Output Current: 500mA 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 VIOC Pin Controls Upstream Regulator to Minimize Power Dissipation n Single Resistor Programs Output Voltage n Programmable Current Limit n Low Dropout Voltage: 260mV n Output Voltage Range: 0V to 15V n Programmable Power Good n Fast Start-Up Capability n Precision Enable/UVLO n Parallelable for Lower Noise and Higher Current n Internal Current Limit with Foldback n Minimum Output Capacitor: 10µF Ceramic n Reverse-Battery and Reverse-Current Protection n 12-Lead MSOP and 3mm × 3mm DFN Packages n RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs n Very Low Noise Instrumentation n High Speed/High Precision Data Converters n Medical Applications: Imaging, Diagnostics 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. LDOIN = 4.3V LDOOUT = 3.3V ILOAD = 500mA LDOOUT LDOIN Noise Floor FREQUENCY (Hz) 10 100 1k 10k 100k 1M 10M 0.01 0.1 1 10 100 1000 30451 TA01b 100µA IN EN/UV PGFB VIOC GND OUT LT3045-1 ILIM PG 10µF 47µF VIN 12V 4.7µF VOUT: VARIABLE IOUT(MAX): 500mA 30451 TA01a 249 SET OUTS LT8608 BST SW PG FB IN EN/UV TR/SS MODE RT INTVCC 7.68k 40.2k 2.2µH 2.21k GND 10nF 1µF 0.22µF fSW = 1MHz L: XFL4020-222MEC VLDOIN – VLDOUT = 1V |
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