ADM7172ACPZ-3.0-R7

Overview

The ADM7172ACPZ-3.0-R7 is a fixed-output low dropout linear regulator manufactured by Analog Devices Inc., providing a regulated 3.0 V output with a maximum load current of 2 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 1.5 A load step. It maintains a low dropout voltage of 172 mV at full load and utilizes a small 4.7 µF ceramic output capacitor for stability.

Feature Summary

• Ultralow noise architecture ensures minimal signal interference for sensitive analog circuits
• High power supply rejection ratio effectively suppresses input voltage ripple across frequencies
• Fast transient response capability allows rapid recovery from sudden load changes
• Low dropout operation maximizes efficiency under varying input-to-output voltage differentials

Applications

• Regulation for analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuits
• Powering precision amplifiers requiring stable voltage rails
• Supplying phase-locked loops (PLLs), voltage-controlled oscillators (VCOs), and clocking ICs
• Communications infrastructure and industrial instrumentation systems

Procurement Notes

Verify the specific ordering suffix matches the required package and tape/reel configuration. Confirm that the fixed 3.0 V output variant aligns with system design requirements before procurement. Ensure compatibility with the manufacturer's recommended input and output capacitance specifications to maintain stability and performance standards.

Selection Notes

Select this component when designing circuits requiring high current delivery alongside stringent noise suppression. The fixed 3.0 V output eliminates external feedback resistors, simplifying board layout. Consider the thermal resistance characteristics of the LFCSP package for heat dissipation planning in compact enclosures.

Part Context

This part belongs to the ADM7172 family of CMOS low dropout regulators designed for high-performance mixed-signal applications. It shares architectural similarities with the ADM7170 and ADM7171 but offers higher current capacity. The device integrates precision enable controls and adjustable soft-start functionality to manage inrush currents during startup sequences.

Replacement Considerations

Direct substitutes include other ADM7172 variants with different fixed output voltages or the adjustable version. Cross-family replacements require verification of pinout compatibility, current ratings, and noise specifications to ensure functional equivalence in existing designs.