ADP7185ACPZN-R7

Overview

The ADP7185ACPZN-R7 is a negative low dropout linear regulator manufactured by Analog Devices Inc. It operates from an input voltage range of −2.0 V to −5.5 V and provides up to −500 mA of output current. The device features ultralow noise, with an integrated output noise of 4 μV rms from 100 Hz to 100 kHz. It offers high power supply rejection ratio (PSRR), reaching 68 dB at 10 kHz under full load. The regulator includes fixed output voltage options ranging from −0.5 V to −4.5 V, as well as an adjustable version. It utilizes an 8-lead, 2 mm × 2 mm LFCSP package.

Feature Summary

• Ultralow output noise performance independent of the output voltage setting
• High power supply rejection ratio across a wide frequency spectrum
• Positive or negative enable logic for flexible system interfacing
• Integrated current-limit and thermal overload protection mechanisms

Applications

• Power regulation for analog-to-digital converters (ADCs)
• Power regulation for digital-to-analog converters (DACs)
• Precision amplifier circuits
• Medical and healthcare equipment
• Industrial instrumentation systems

Procurement Notes

Verify the specific ordering suffix and output voltage option required for your design, as the ADP7185 family includes multiple fixed voltage variants and an adjustable model. Confirm that the LFCSP-8 package matches your PCB footprint requirements. Ensure compatibility with the recommended ceramic capacitor specifications to maintain stability and achieve the specified transient response characteristics.

Selection Notes

Select this component when designing negative rail supplies for noise-sensitive mixed-signal applications requiring high current capability. Consider the dropout voltage characteristics relative to your minimum input voltage and maximum load current. Evaluate the thermal resistance of your PCB layout against the junction-to-ambient thermal data to ensure reliable operation within the specified temperature range without derating.

Part Context

This part belongs to the ADP7185 series of low dropout linear regulators designed for negative voltage rails. It is engineered using complementary metal oxide semiconductor technology to deliver high performance in a compact form factor. The series supports various fixed output voltages and an adjustable configuration, catering to diverse requirements in communications, infrastructure, and precision measurement environments.

Replacement Considerations

Direct substitutes include other ADP7183 variants if adjustable output is acceptable, though output current differs. Verify pinout compatibility and electrical parameters such as PSRR and noise density before substitution. Consult the manufacturer's documentation for cross-reference information regarding alternative packages or updated revisions.