ADM7171ACPZ-1.8-R7

Overview

The ADM7171ACPZ-1.8-R7 is a fixed-output CMOS low dropout linear regulator manufactured by Analog Devices Inc. It provides a regulated 1.8 V output with a maximum load current of 1 A, operating from an input voltage range of 2.3 V to 6.5 V. The device features ultralow noise performance and high power supply rejection ratio (PSRR). It is housed in an 8-lead, 3 mm × 3 mm LFCSP package.

Feature Summary

• Delivers up to 1 A of continuous output current while maintaining a low quiescent current profile suitable for portable applications.
• Provides ultralow output noise and high PSRR to ensure clean power delivery for sensitive analog and mixed-signal circuits.
• Features fast transient response capabilities that maintain stability using small ceramic output capacitors.
• Includes precision enable control and adjustable soft start functionality to manage inrush current during startup.

Applications

• Power regulation for ADC and DAC circuits
• Supplying precision amplifiers and PLL/VCOs
• Clocking IC power management
• Medical and healthcare equipment
• Industrial instrumentation systems

Procurement Notes

Verify the specific ordering suffix R7 indicates tape and reel packaging when sourcing components. Confirm the fixed 1.8 V output variant matches the design requirement, as the ADM7171 family includes adjustable and other fixed voltage options. Ensure compatibility with the required thermal management strategy given the LFCSP package constraints.

Selection Notes

Select this component for designs requiring high current capability combined with strict noise specifications. The fixed 1.8 V output eliminates the need for external feedback resistors found in adjustable versions. Consider the minimum input voltage requirement relative to the dropout voltage at the expected load current to ensure proper regulation under all operating conditions.

Part Context

This part belongs to the ADM7171 series of high-performance CMOS LDO regulators. The series offers variants with different output currents and fixed or adjustable voltages. The ADM7171 specifically targets applications needing robust line and load transient response without requiring large bulk capacitance, distinguishing it from standard LDOs.

Replacement Considerations

The ADM7170 serves as a lower current alternative within the same family. Designers should verify pinout compatibility and thermal characteristics when substituting parts. Cross-reference datasheets to confirm equivalent PSRR and noise specifications for the target application.