ADM7171ACPZ-3.3-R7

Overview

The ADM7171ACPZ-3.3-R7 is a fixed-output low dropout linear regulator manufactured by Analog Devices Inc., providing a regulated 3.3 V output with a maximum load current of 1 A. It operates from an input voltage range of 2.3 V to 6.5 V and features ultralow noise performance, delivering 5 μV rms in the 100 Hz to 100 kHz bandwidth. The device achieves high power supply rejection ratio (PSRR) of 60 dB at 100 kHz and fast transient response, settling within 1.5 μs for a 1 mA to 500 mA load step. Initial accuracy is specified between −0.5% and +1%, expanding to ±1.5% over line, load, and temperature conditions. Quiescent current is typically 0.7 mA with no load, dropping to 0.25 μA in shutdown mode.

Feature Summary

• Ultralow noise architecture delivers consistent 5 μV rms output noise across all fixed voltage options.
• High power supply rejection ratio maintains 60 dB attenuation at 100 kHz under full load conditions.
• Fast transient response capability settles output deviations within 1.5 μs during rapid load steps.
• Precision enable pin provides controlled startup sequencing with programmable soft start functionality.

Applications

• Regulation for analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuits
• Powering precision amplifiers and phase-locked loops (PLLs)/voltage-controlled oscillators (VCOs)
• Clocking integrated circuits requiring clean power rails in communications infrastructure
• Medical and healthcare equipment demanding stable low-noise voltage regulation

Procurement Notes

Verify component authenticity through authorized distribution channels or direct manufacturer procurement. Confirm package marking matches the 8-lead LFCSP specification. Ensure ordering suffix -R7 corresponds to tape and reel packaging requirements. Validate RoHS compliance status against current regulatory standards before integration into production assemblies.

Selection Notes

Select this fixed 3.3 V variant when precise output voltage stability is required without external feedback networks. Consider the 4.7 μF ceramic capacitor requirement for optimal transient performance. Evaluate thermal dissipation capabilities based on input-output voltage differential and maximum load current constraints within the operating temperature range.

Part Context

This component belongs to the ADM7171 family of CMOS low dropout regulators designed for high-performance analog and mixed-signal applications. The series includes adjustable versions and multiple fixed output voltage options ranging from 1.2 V to 5.0 V. All variants share the same compact 8-lead, 3 mm × 3 mm LFCSP package footprint and utilize advanced proprietary architecture for superior noise and PSRR characteristics.

Replacement Considerations

ADM7171ACPZ-3.0-R7 offers identical electrical specifications with a 3.0 V fixed output. ADM7171ACPZ-5.0-R7 provides the same package and performance profile with a 5.0 V fixed output. These alternatives maintain compatibility with existing board layouts while adjusting the regulated voltage level to match specific circuit requirements.