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GENERAL DESCRIPTION

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.

FEATURES

? 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

? Programmable current limit

? Low-dropout voltage: 310 mV

? Output voltage range: 0.2 V to 15 V

? Programmable power good

? Fast start-up capability

? Precision enable/UVLO

? Parallelable for lower noise and higher current

? Internal current limit with foldback

? Minimum output capacitor: 2 parallel 10 μF ceramic

? Compact, low profile, 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