ADM7154ARDZ-2.5-R7

Overview

The ADM7154ARDZ-2.5-R7 is a fixed-output linear regulator providing 2.5 V at up to 600 mA load current. It operates from an input voltage range of 2.3 V to 5.5 V with typical quiescent current of 4 mA and shutdown current of 0.2 μA. The device delivers ultralow noise, specified as 0.9 μV rms (100 Hz to 100 kHz) and 1.5 nV/√Hz spectral density (10 kHz to 1 MHz). Power supply rejection ratio reaches 90 dB from 200 Hz to 200 kHz. Initial output accuracy is ±0.5%, with line regulation of 0.02 %/V and load regulation of 0.3 %/A. Dropout voltage is typically 120 mV at 600 mA. It includes precision enable, thermal overload protection, and current limiting.

Feature Summary

• Ultralow noise performance optimized for RF applications
• High power supply rejection ratio across wide frequency ranges
• Precision enable pin with programmable thresholds
• Stable operation with small ceramic output capacitors

Applications

• PLLs and VCOs requiring clean power supplies
• Communications infrastructure equipment
• Backhaul and microwave link systems

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing. Confirm the ARDZ designation corresponds to the industrial temperature range (-40°C to +85°C) and SOIC package type. Ensure compatibility with ADIsimPower design tools for schematic generation. Check manufacturer documentation for any recent revision changes affecting ordering or electrical characteristics.

Selection Notes

Select this component for designs requiring high PSRR and minimal output noise in compact form factors. The fixed 2.5 V output eliminates external resistor networks required for adjustable regulators. Verify that input voltage remains within the 2.3 V to 5.5 V range under all operating conditions. Consider thermal dissipation requirements given the 600 mA maximum load capability and available package options.

Part Context

This part belongs to the ADM7154 family of 600 mA RF linear regulators. It shares architectural similarities with the ADM7155 but offers fixed output voltages instead of adjustable options. The device complements other Analog Devices PMIC solutions by providing specialized low-noise regulation for sensitive analog and RF circuits.

Replacement Considerations

ADM7154ACPZ-2.5-R7 serves as a direct replacement offering identical electrical specifications in an LFCSP package instead of SOIC. Both variants maintain the same 2.5 V fixed output and 600 mA current rating while differing only in physical footprint and thermal characteristics.

FAQ

What is the minimum recommended output capacitance for stability?

The ADM7154 requires a minimum of 10 µF ceramic output capacitor with ESR less than 0.2 Ω to ensure loop stability.

How does the BYP capacitor affect noise performance?

Increasing the BYP capacitor value reduces output noise below 1 kHz, though it increases start-up time. A 1 µF capacitor is typically used for optimal high-frequency noise filtering.

Can the enable threshold be adjusted?

Yes, the EN pin threshold can be programmed higher than the nominal 1.22 V using external resistors to set specific turn-on voltages with added hysteresis.