ADP7182ACPZN-R7

Overview

The ADP7182ACPZN-R7 is a negative low dropout linear regulator from Analog Devices, operating within an input voltage range of −2.7 V to −28 V and delivering up to −200 mA output current. It features a low noise specification of 18 μV rms and a power supply rejection ratio of 66 dB at 10 kHz. The device supports adjustable output voltages ranging from −1.22 V to −VIN + VDO via an external feedback divider. It includes positive or negative enable logic, current-limit protection, thermal overload shutdown, and requires a minimum 2.2 μF ceramic output capacitor for stability.

Feature Summary

• Provides ultra-low output noise of 18 μV rms independent of the output voltage setting.
• Features high power supply rejection ratio (PSRR) of 66 dB at 10 kHz for effective ripple suppression.
• Supports flexible control with positive or negative enable logic levels.
• Ensures stability using small 2.2 μF ceramic output capacitors.

Applications

• Regulation for noise-sensitive analog-to-digital converter (ADC) circuits
• Precision digital-to-analog converter (DAC) power supplies
• High-performance precision amplifier biasing
• Communications and infrastructure equipment power management

Procurement Notes

Verify the specific package variant matches the design requirements, as the ADP7182 series is available in 5-lead TSOT, 6-lead LFCSP, and 8-lead LFCSP configurations. Confirm that the ordering suffix corresponds to the desired reel quantity and tape specifications. Ensure the selected part number aligns with the required fixed or adjustable output voltage configuration before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring negative voltage rails between −27 V and −1.2 V. It is suitable for applications demanding low noise performance and high PSRR. Consider the thermal resistance characteristics of the chosen package type, such as the 6-lead LFCSP, to ensure junction temperatures remain within the specified −40°C to +125°C operating range under maximum load conditions.

Part Context

This component belongs to the ADP7182 family of CMOS low dropout regulators designed for high input voltage applications. It utilizes an advanced proprietary architecture to achieve excellent line and load transient response. The family supports both fixed and adjustable output versions, catering to diverse power management needs in mixed-signal environments where clean negative power rails are critical.

Replacement Considerations

Direct replacements include other Analog Devices negative LDOs within the same family, such as the ADP7183, which offers similar functionality but may differ in output current capabilities and package options. Verify pin compatibility and electrical specifications against the original design requirements before substitution.