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