ADM7171ACPZ-5.0-R7

Overview

The ADM7171ACPZ-5.0-R7 is a fixed-output low dropout linear regulator manufactured by Analog Devices Inc., providing a regulated 5.0 V output with a maximum load current of 1 A. It operates within 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. Quiescent current is typically 0.7 mA at no load and 4.0 mA at full load. Dropout voltage is specified at 84 mV typical and 135 mV maximum at 1 A load. It includes precision enable control, adjustable soft start, and overcurrent/thermal protection.

Feature Summary

• Ultralow noise architecture delivers consistent 5 μV rms output noise independent of the fixed output voltage setting.
• High power supply rejection ratio maintains effective filtering across varying input conditions and frequencies.
• Fast transient response capability ensures rapid stabilization following significant load current changes.
• Precision enable pin allows precise control over regulator startup and shutdown states.

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
• Communications infrastructure and industrial instrumentation systems

Procurement Notes

Verify the specific suffix -R7 indicates tape and reel packaging when sourcing. Confirm the manufacturer part number matches exactly to ensure the 5.0 V fixed output variant. Check RoHS compliance status as per the latest datasheet revision. Ensure the ordering quantity aligns with standard reel sizes if applicable. Validate that the component meets the required operating temperature range specifications for your application environment.

Selection Notes

Select this component when a stable 5.0 V rail is required from inputs between 2.3 V and 6.5 V. It is suitable for designs needing minimal output capacitance, specifically supporting stability with small 4.7 μF ceramic capacitors. Consider the thermal resistance characteristics of the 8-lead LFCSP package for heat dissipation under full load conditions. Evaluate the quiescent current consumption against battery life requirements for portable applications.

Part Context

This device belongs to the ADM7171 family of CMOS low dropout linear regulators. The family offers various output voltage options including adjustable versions and other fixed voltages like 3.0 V and 3.3 V. Related devices include the ADM7170 with 500 mA output and the ADM7172 with 2 A output capability, all sharing similar architectural benefits such as high PSRR and low noise in compact packages.

Replacement Considerations

Direct substitutes within the same family include ADM7171ACPZ-3.0-R7 or ADM7171ACPZ-3.3-R7 for different fixed voltages. For higher current needs, consider the ADM7172 series. Lower current applications might utilize the ADM7170 series. Verify pin compatibility and thermal performance when switching between these variants.