Analog Devices LT3099 Product Info

The LT3099 is a high-performance, low-dropout negative linear regulator featuring Analog Devices, Inc.’s ultralow noise and ultrahigh power-supply rejection ratio (PSRR) architecture for powering noisesensitive applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3099 can be easily paralleled to reduce noise further, increase output current, and spread heat on the PCB.

The device supplies 1A at a typical 350mV dropout voltage. The operating quiescent current is nominally 2.9mA and drops to 5μA in shutdown. The LT3099’s wide output voltage range (0V to -19V) error amplifier operates at unity gain and provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additionally, the regulator features a bi-directional enable pin, programmable current limit, fast start-up capability, and programmable power good for indicating output voltage regulation. The regulator incorporates a tracking function to control an upstream supply to maintain a constant voltage across the LT3099 and minimize power dissipation.

Built-in protection includes an internal current limit with foldback and a thermal limit with hysteresis. The LT3099 is available in a thermally enhanced 4mm × 3mm DFN package.

APPLICATIONS

• RF Power Supplies and Precision Power Supplies
• Very Low Noise Instrumentation
• High-speed/High-precision Data Converters
• Medical Applications: Diagnostics and Imaging
• Post-regulator for Switching Supplies