LT3045 Ultra-Low Noise 3.3V Linear Voltage Regulator Module – High-Performance Upgrade to LM78/LM317, Ideal for RF & Precision Power Supply

Description

Product Overview

The LT3045 Ultra-Low Noise Linear Voltage Regulator Module is a professional-grade power solution designed for applications where power supply noise cannot be tolerated. Engineered by Analog Devices (formerly Linear Technology), the LT3045 represents the gold standard in low-dropout regulator (LDO) technology, delivering an astonishing 0.8µVRMS output noise across the 10Hz to 100kHz bandwidth .

For engineers and audiophiles seeking to upgrade from legacy regulators like the LM78xx series or LM317, the LT3045 offers a dramatic performance improvement. While the LM317 typically produces around 40µVRMS of noise, the LT3045 achieves 50 times less noise, making it the definitive choice for powering high-resolution DACs, precision instrumentation, RF synthesizers, and medical imaging equipment .

This fixed 3.3V output version simplifies integration for common logic and analog supply rails. The module incorporates all necessary support components on a compact PCB, allowing you to instantly upgrade existing 3.3V power rails or create new ultra-clean supplies for your most demanding projects. With an input range of 1.8V to 20V, high-frequency PSRR of 76dB at 1MHz, and a low dropout voltage of just 260mV, this regulator maintains exceptional performance regardless of load or line conditions .

Key Features

• Ultra-Low Output Noise: 0.8µVRMS (10Hz to 100kHz) and 2nV/√Hz spot noise at 10kHz – unprecedented cleanliness for sensitive analog and RF circuits .

• High-Frequency Power Supply Rejection Ratio (PSRR): 76dB at 1MHz effectively eliminates switching regulator ripple and high-frequency interference .

• Fixed 3.3V Output: Pre-configured for convenient drop-in replacement of 3.3V rails in audio DACs, microcontrollers, FPGAs, and sensors.

• 500mA Output Current: Capable of powering multiple low-noise devices simultaneously, with easy paralleling for higher current requirements .

• Wide Input Voltage Range: Accepts 1.8V to 20V DC input, providing flexibility for various power sources including batteries and pre-regulated supplies .

• Low Dropout Voltage: 260mV typical at full 500mA load – minimizes power dissipation and heat generation .

• Built-in Protection Features: Includes programmable current limit, reverse-battery and reverse-current protection, internal current limit with foldback, and thermal shutdown with hysteresis .

• Industrial Temperature Range: Rated for -40°C to +125°C, suitable for demanding environmental conditions .

• Pin-Compatible Replacement: For fixed voltage applications, this module can replace LM317, LM7805, and other 3-terminal regulators with superior performance .

Technical Specifications