Power Electronics / Power Management


Ultra-low noise linear regulator

30 August 2023 Power Electronics / Power Management

Analog Devices’ LT3073 is a 3 A, ultra-low noise, high PSRR linear regulator, which features 45 mV dropout and ultra-fast time response. With an input range of 0,6 to 5,5 V, the regulator integrates a digitally programmable output of 0,5 to 4,2 V.

The device has an ultra-low RMS noise of 1,2 µV (10 Hz to 100 kHz), and an ultra-low 1/f noise of 7 µVP-P from 0,1 to 10 Hz. The LT3073 incorporates a unique tracking feature (VIOC) to control the upstream switching regulator to maintain a constant voltage across the LT3073 and minimise power dissipation.

A precision current monitor provides power monitoring for system energy management, while precision current limiting allows users to minimise input power supply size and cost. Built-in protection includes UVLO, internal current limit, and thermal shutdown with hysteresis.

The wide bandwidth and high PSRR permit the use of small ceramic capacitors, saving bulk capacitance and cost. The LT3073 is ideal for powering high-performance FPGAs, data converters, RF, and noise-sensitive signal chain applications.


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