FEATURES：
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 Single Resistor Programs Output Voltage
n High Bandwidth: 1MHz
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 10-Lead 3mm × 3mm DFN Packages
APPLICATIONS：
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 Precision Power Supplies
n Post-Regulator for Switching Supplies
DESCRIPTION：
The LT®3045 is a high performance low dropout linear
regulator featuring LTC’s ultralow noise and ultrahigh
PSRR architecture for powering noise sensitive applications. Designed as a precision current reference followed
by a high performance voltage buffer, the LT3045 can be
easily paralleled to further reduce noise, increase output
current and spread heat on the PCB.
The device supplies 500mA at a typical 260mV dropout
voltage. Operating quiescent current is nominally 2.2mA
and drops to <<1µA in shutdown. The LT3045’s wide
output voltage range (0V to 15V) while maintaining unitygain 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 capability and programmable power good to indicate output
voltage regulation.
The LT3045 is stable with a minimum 10µF ceramic output
capacitor. Built-in protection includes reverse-battery
protection, reverse-current protection, internal current
limit with foldback and thermal limit with hysteresis. The
LT3045 is available in thermally enhanced 12-Lead MSOP
and 10-Lead 3mm × 3mm DFN packages.
