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