ADI LT3041ADE#PBF

A high-performance, low-dropout linear regulator featuring 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, it can be easily paralleled to further reduce noise, increase output current, and spread heat on the printed circuit board (PCB). It 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) 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. It is available in a thermally enhanced, 14-lead 4 mm×3 mm, DFN package.

• 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

• 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