ADP7182ACPZ-R7

Overview

The ADP7182ACPZ-R7 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc. It operates from an input voltage range of −2.7 V to −28 V and provides up to −200 mA of output current. The device features low noise performance with an output noise of 18 μV rms, independent of the output voltage. It offers high power supply rejection ratio (PSRR) of 66 dB at 10 kHz when VOUT = −3 V. The regulator supports both fixed and adjustable output voltages, with the adjustable version allowing outputs from −1.22 V to −VIN + VDO via an external feedback divider. It includes current-limit and thermal overload protection, and is stable with small 2.2 μF ceramic output capacitors.

Feature Summary

• Low noise performance with 18 μV rms output noise
• High power supply rejection ratio (PSRR) of 66 dB at 10 kHz
• Supports positive or negative enable logic for flexible interfacing
• Stable with small 2.2 μF ceramic output capacitors

Applications

• Regulation to noise-sensitive applications
• Analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuits
• Precision amplifiers
• Communications and infrastructure systems
• Medical and healthcare equipment

Procurement Notes

Verify the exact package type and pin configuration required for your design, as the ADP7182 series is available in multiple packages including 5-lead TSOT, 6-lead LFCSP, and 8-lead LFCSP. Ensure that the specific ordering suffix matches your desired output voltage configuration (fixed or adjustable). Confirm compatibility with your PCB layout constraints, particularly regarding the exposed pad connection to VIN for proper thermal and electrical operation. Always refer to the latest datasheet revision for updated specifications and application notes.

Selection Notes

Select the ADP7182ACPZ-R7 when designing circuits requiring a negative voltage rail with low noise and high PSRR. Consider the input voltage range of −2.7 V to −28 V and the maximum output current of −200 mA. Choose between fixed or adjustable output versions based on your specific voltage requirements. Ensure that the selected package fits your board space and thermal management needs. Verify that the enable logic polarity matches your system's control signals.

Part Context

The ADP7182 is part of Analog Devices' portfolio of low dropout linear regulators designed for high-performance analog and mixed-signal circuits. It is ideal for applications requiring regulation from −27 V down to −1.2 V rails. The device utilizes an advanced proprietary architecture to achieve excellent line and load transient response. It is supported by the ADIsimPower design tool for ease of integration into various power management solutions.

Replacement Considerations

When replacing the ADP7182ACPZ-R7, ensure that the substitute component matches the input voltage range, output current capability, and package type. Verify that the replacement also offers low noise and high PSRR if these are critical to your application. Check for compatibility with existing PCB layouts, especially regarding pin configurations and thermal pad connections. Consult the manufacturer's documentation for any recommended alternatives within the same product family.

FAQ

What is the typical output noise of the ADP7182?

The ADP7182 has a typical output noise of 18 μV rms, which is independent of the output voltage.

Can the ADP7182 be used with positive or negative enable logic?

Yes, the ADP7182 supports both positive and negative enable logic, providing flexibility for interfacing with different control signals.

What is the minimum capacitance required for stable operation?

The ADP7182 is stable with a minimum capacitance of 2.2 μF ceramic output capacitor.