Power by Linear™/ADI’s LT3094 are high-performance, low dropout (LDO) negative linear regulators. These regulators have ultra-low noise and ultra-high PSRR architecture for powering noise-sensitive applications. They easily parallel to further reduce noise, increase output current, and spread heat on a PCB. The LT3094 supplies 500 mA at a typical 235 mV dropout voltage. The operating quiescent current is nominally 2.35 mA and drops to 3 μA in shutdown. The device's wide output voltage range (0 V to -19.5 V) error amplifier operates in unity-gain and provides virtually constant output noise, power supply rejection ratio (PSRR), bandwidth, and load regulation independent of the programmed output voltage.

The additional features include a bipolar enable pin, programmable current limit, fast start-up capability, and programmable power good to indicate output voltage regulation. These regulators incorporate a tracking function to control an upstream supply to maintain a constant voltage across the LT3094 to minimize power dissipation and optimize PSRR.

The LT3094 is stable with a minimum 10 μF ceramic output capacitor. The built-in protection includes internal current limit with foldback and thermal limit with hysteresis. These regulators are available in MSOP and DFN packages. They are the ideal regulator for noise sensitive applications found in RF, instrumentation, and medical applications.