ADP7183ACPZN1.5-R7

Overview

The ADP7183ACPZN1.5-R7 is a negative-output low dropout linear regulator from Analog Devices, providing a fixed -1.5 V output with up to -300 mA load current capability. It operates within 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 achieves high power supply rejection ratios of 75 dB at 10 kHz and 62 dB at 100 kHz under full load. It incorporates positive or negative enable logic, thermal overload protection, and current-limit safeguards. Packaged in an 8-lead, 2 mm × 2 mm LFCSP, it requires only a 4.7 μF ceramic capacitor for stability.

Feature Summary

• Ultralow noise architecture delivers 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 loads.
• Flexible enable pin supports both positive and negative logic levels for system integration compatibility.
• Operates stably with small 4.7 μF ceramic capacitors on both input and output terminals.

Applications

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

Procurement Notes

Verify the specific ordering suffix matches the required fixed output voltage option. Confirm package type and reel specifications align with manufacturing requirements. Ensure environmental compliance documentation is available for the intended deployment region. Cross-reference the datasheet revision to validate parameter accuracy against current production standards.

Selection Notes

Select this component when a stable negative voltage rail is required for sensitive analog circuitry. The fixed -1.5 V output eliminates external feedback resistor networks, simplifying board layout. Consider the thermal resistance characteristics if operating near maximum load currents. Verify that the input voltage differential remains sufficient to maintain regulation during transient conditions.

Part Context

This part belongs to the ADP7183 family of low dropout regulators designed for high-performance mixed-signal applications. The series offers multiple fixed voltage options ranging from -0.5 V to -4.5 V alongside an adjustable variant. All members share the same compact LFCSP footprint and core architectural benefits regarding noise and PSRR performance.

Replacement Considerations

Direct substitutes include other ADP7183 variants with different fixed output voltages such as ADP7183ACPZN-1.2-R7 or ADP7183ACPZN-3.3-R7. Ensure the replacement maintains the same -300 mA current rating and compatible package dimensions for mechanical fit.