LT3045EMSE#TRPBF

The LT3045 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 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 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.

Applications

• RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
• Very Low Noise Instrumentation
• High Speed/High Precision Data Converters
• Medical Applications: Imaging, Diagnostics
• Precision Power Supplies
• Post - Regulator for Switching Supplies

Key features

• Ultralow RMS Noise: 0.8µV_{RMS} (10Hz to 100kHz)
• Ultralow Spot Noise: 2nV/√Hz at 10kHz
• Ultrahigh PSRR: 76dB at 1MHz
• Output Current: 500mA
• Wide Input Voltage Range: 1.8V to 20V
• Single Capacitor Improves Noise and PSRR
• 100µA SET Pin Current: ±1% Initial Accuracy
• Single Resistor Programs Output Voltage
• High Bandwidth: 1MHz
• Programmable Current Limit
• Low Dropout Voltage: 260mV
• Output Voltage Range: 0V to 15V
• Programmable Power Good
• Fast Start - Up Capability
• Precision Enable/UVLO
• Parallelable for Lower Noise and Higher Current
• Internal Current Limit with Foldback
• Minimum Output Capacitor: 10µF Ceramic
• Reverse - Battery and Reverse - Current Protection
• 12 - Lead MSOP and 10 - Lead 3mm × 3mm DFN Package