ADP7185ACPZN2.5-R7

Overview

The ADP7185ACPZN2.5-R7 is a negative low dropout linear regulator providing a fixed output voltage of −2.5 V with a maximum load current of −500 mA. It operates from an input voltage range of −2.0 V to −5.5 V and features ultralow noise performance, delivering 4 μV rms integrated noise from 100 Hz to 100 kHz. The device offers high power supply rejection ratios of 68 dB at 10 kHz and 40 dB at 1 MHz under full load conditions. It utilizes an 8-lead, 2 mm × 2 mm LFCSP package and includes positive or negative enable logic for flexible system control.

Feature Summary

• Ultralow noise architecture provides consistent 4 μV rms output noise independent of the selected output voltage setting.
• High power supply rejection ratio maintains effective filtering across frequencies up to 1 MHz under heavy load conditions.
• Flexible enable pin supports both positive and negative logic levels for seamless integration into various control schemes.
• Stable operation is achieved using small ceramic capacitors, specifically requiring only a 4.7 μF input and output capacitance.

Applications

• Power regulation for analog-to-digital converters (ADCs)
• Supply conditioning for digital-to-analog converters (DACs)
• Noise-sensitive precision amplifier circuits
• Medical and healthcare instrumentation systems

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing components. Confirm that the ACPZN designation corresponds to the 8-lead LFCSP package variant. Ensure compatibility with negative voltage rails ranging from −2.0 V to −5.5 V. Check for RoHS compliance status prior to final procurement decisions.

Selection Notes

Select this component when designing negative rail supplies requiring minimal noise injection into sensitive analog front ends. The fixed −2.5 V output eliminates the need for external feedback resistors compared to adjustable variants. Consider thermal dissipation requirements given the compact LFCSP footprint during high-current operations near the −500 mA limit.

Part Context

This part belongs to the ADP7185 family of complementary metal oxide semiconductor low dropout regulators manufactured by Analog Devices. The series is designed for applications demanding high performance in a small form factor. Other options within the family include different fixed voltage outputs and adjustable versions sharing similar electrical characteristics and package styles.

Replacement Considerations

Direct substitutes within the same family include other fixed voltage variants such as ADP7185ACPZN3.3-R7 or ADP7185ACPZN1.2-R7. These parts share identical pinouts and electrical specifications but provide different regulated output voltages. Verify that the required system voltage matches the replacement part's fixed output specification.