Negative linear regulators for providing power to noise-sensitive applications

Analog Devices LT3093 Negative Linear Regulators are a high-performance, low dropout negative linear regulators that offer the company’s ultra-low noise and ultra-high PSRR architecture for providing power to noise-sensitive applications. The device can be readily paralleled to reduce noise, increase output current and spread heat on a PCB.

The device provides 200mA at a typical 190mV dropout voltage. Operating quiescent current is nominally 2.35mA and drops to 3µA in shutdown. The device’s wide output voltage range, from 0V to 9.5V, error amplifier works in unity-gain. This option offers practically constant output noise, bandwidth, PSRR, and load regulation independent of the programmed output voltage. Further features are a programmable current limit, bipolar enable pin, fast startup ability and programmable power good to show output voltage regulation. The regulator includes a tracking function to control an upstream supply to sustain a constant voltage across the device to minimise power dissipation and optimise PSRR.

The device is stable with a minimum 4.7µF ceramic output capacitor. Built-in protection incorporates an internal current limit with foldback and thermal limit with hysteresis. The device is offered in thermally enhanced 12-Lead MSOP and 3mm x 3mm DFN Packages.