LT3094, −20V, 500mA, Ultralow Noise, Ultrahigh PSRR Negative Linear Regulator
Analog Devices announces the Power by Linear LT3094, an ultralow noise, ultrahigh power supply ripple rejection (PSRR), low dropout voltage, 500mA negative linear regulator that targets applications requiring the lowest noise performance. It features industry-leading 0.8µVRMS integrated output noise (10Hz to 100kHz), providing the quietest environment for precision measurements of low level signals. The LT3094 features very low 2nV/√Hz spot noise (at 10kHz), minimizing phase noise when powering sensitive communications circuitry. PSRR performance is exceptional over a wide frequency range: low frequency PSRR exceeds 100dB out to nearly 4kHz and high frequency PSRR exceeds 70dB at 2MHz. The LT3094’s high PSRR greatly reduces ripple and noise when used as a post regulator for switching power supplies.
The LT3094 utilizes a proprietary LDO architecture – its precision current source reference followed by a high-performance unity gain buffer results in virtually constant noise, PSRR and load regulation performance, independent of output voltage. This architecture permits easy paralleling of multiple LT3094s to further increase output current, spread heat on a printed circuit board and decrease output noise. In addition, it allows the output voltage to be programmed down to 0V.
Delivering up to 500mA output current, the LT3094 has a low 235mV typical dropout voltage at full load. It features a –2V to –20V input voltage range and a 0V to –19.5V output voltage range with ±2% tolerance over line, load and temperature. The device’s wide input and output voltage ranges, high PSRR and ultralow noise performance are ideal for powering noise-sensitive applications such as LNA power, very low noise instrumentation, high speed/high precision data converters, power medical applications such as imaging and diagnostics, RF switch negative supplies, PA biasing, precision power supplies and as a post regulator for switching power supplies.
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