20V, 200mA, Ultra-Low Noise, Ultra-High PSRR, Linear Regulator

The LT3046 is a high-performance, low-dropout linear regulator featuring Analog Devices, Inc. ultra-low noise and ultra-high PSRR architecture for powering noisesensitive applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3046 can be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB.

The device supplies 200mA at a typical 300mV dropout voltage. Operating quiescent current is nominally 3.7mA and drops to 26μA in shutdown. The LT3046’s wide output-voltage range (0.2V to 19V) while maintaining unity-gain operation provides virtually constant output noise, PSRR, bandwidth, and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capability, and programmable power good to indicate output voltage regulation.

Built-in protection includes reverse-battery protection, reverse-current protection, internal current limit with foldback and thermal limit with hysteresis. The LT3046 is available in thermally enhanced, 12-lead, 3mm × 3mm, DFN and 11-Ball, 1.621mm × 1.680mm, WLCSP packages.

APPLICATIONS

* RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs

* Very Low-Noise Instrumentation

* High-Speed/High-Precision Data Converters

* Post-Regulator for Switching Supplies

* Ultra-Low RMS Noise: 0.8μVRMS (10Hz to 100kHz)

* Ultra-Low Noise: 2.2nV/√Hz at 10kHz

* Ultra-Low 1/f Noise: 2.5μVP-P (0.1Hz to 10Hz)

* Ultra-High PSRR: 82dB at 1MHz

* Output Current: 200mA

* Wide Input-Voltage Range: 2.2V to 20V

* Single Capacitor Improves Noise and PSRR

* SET Pin Current: 100μA, ±0.5% Initial Accuracy

* Single Resistor Programs Output Voltage

* Programmable Current Limit