20 V, 1 A, Ultra-Low Noise, Ultra-High PSRR Linear Regulator with VIOC Control

The LT3041 is a high-performance, low-dropout linear regulator featuring Analog Devices, Inc., ultra-low noise and ultra-high power supply rejection ratio (PSRR) architecture for powering noise-sensitive applications. Designed as a precision-current reference followed by a high-performance voltage buffer, the LT3041 can be easily paralleled to further reduce noise, increase output current, and spread heat on the printed circuit board (PCB).

The LT3041 supplies 1 A at a typical 310 mV dropout voltage. The operating quiescent current is nominally 4.3 mA and drops to 18 μA in shutdown. The wide output voltage range (0.2 V to 15 V) of the LT3041 maintained by the unity-gain operation provides virtually constant output noise, PSRR, bandwidth, and load regulation, independent of the programmed output voltage. Additionally, the regulator features VIOC, 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 LT3041 is available in a thermally enhanced, 14-lead 4 mm × 3 mm, DFN package.

APPLICATIONS

* RF power supplies: phase-locked loops, voltage-controlled oscillators, mixers, low-noise amplifiers, and power amplifiers

* Low-noise instrumentation

* High-speed and high-precision data converters

* Medical applications: imaging and diagnostics

* Postregulator for switching supplies

* Ultra-low output RMS noise: 1.0 μV rms (10 Hz to 100 kHz)

* Ultra-low output noise spectral density: 3 nV/√Hz at 10 kHz

* Ultra-low 1/f noise: 8 μV p-p (0.1 Hz to 10 Hz)

* Ultra-high PSRR: 80 dB at 1 MHz

* Output current: 1 A

* Wide input voltage range: 2.2 V to 20 V

* Single capacitor improves noise and PSRR

* SET pin current: 100 μA, ±0.5% initial accuracy

* VIOC pin to manage power dissipation

* Single resistor programs output voltage