ADP7183ACPZN1.8-R7

Overview

The ADP7183ACPZN1.8-R7 is a negative low dropout linear regulator from Analog Devices, operating within an input voltage range of −2.0 V to −5.5 V and delivering up to −300 mA output current. It provides a fixed output voltage of −1.8 V with ±0.5% initial accuracy. The device features ultralow noise (4 μV rms) and high power supply rejection ratio (PSRR), reaching 75 dB at 10 kHz. It operates in temperatures from −40°C to +125°C, housed in an 8-lead LFCSP package.

Feature Summary

• Ultralow noise architecture providing 4 μV rms integrated noise independent of the output voltage setting.
• High power supply rejection ratio (PSRR) maintaining effective filtering across wide frequency ranges under heavy loads.
• Flexible enable logic supporting both positive and negative control signals for system integration compatibility.
• Optimized stability with small ceramic capacitors, requiring only 4.7 μF for reliable transient response.

Applications

• Powering analog-to-digital converters (ADCs) requiring clean negative rails
• Supplying precision amplifiers in instrumentation systems
• Providing regulated bias for digital-to-analog converters (DACs)
• Noise-sensitive medical and healthcare equipment

Procurement Notes

Verify the specific ordering suffix matches the required fixed output voltage of −1.8 V. Confirm the package type corresponds to the 8-lead LFCSP variant. Ensure the revision level aligns with your design specifications. Cross-reference the manufacturer part number directly with official Analog Devices documentation to avoid counterfeit components.

Selection Notes

Select this component when a stable negative voltage rail is required for sensitive analog circuits. The fixed −1.8 V option eliminates external feedback resistors, simplifying board layout. Consider the thermal performance of the LFCSP package if operating near maximum load currents or elevated ambient temperatures.

Part Context

This regulator belongs to the ADP7183 family, designed for high-performance mixed-signal applications. The series offers various fixed voltage options ranging from −0.5 V to −4.5 V, alongside an adjustable version. All variants share the same compact footprint and low-noise characteristics, ensuring consistent performance across different system voltage requirements.

Replacement Considerations

Direct pin-compatible replacements are not explicitly listed in the provided datasheet. Verify electrical parameters such as dropout voltage, quiescent current, and PSRR against alternative negative LDO regulators before substitution.