ADP7118ARDZ

Overview

The ADP7118ARDZ is a CMOS low dropout linear regulator manufactured by Analog Devices Inc. It operates from an input voltage range of 2.7 V to 20 V and provides up to 200 mA of output current. The device features a typical quiescent current of 50 µA with no load and a shutdown current of 1.8 µA at VIN = 5 V. It offers high power supply rejection ratios, reaching 88 dB at 10 kHz and 50 dB at 1 MHz for outputs ≤ 5 V. The output noise is specified at 11 µV rms across all fixed voltage options. Initial accuracy is ±0.8%, with line regulation at ±0.015 %/V and load regulation at 0.004 %/mA. The package is an 8-lead SOIC.

Feature Summary

• Provides ultralow output noise of 11 µV rms independent of the fixed output voltage setting.
• Features user-programmable soft start capability via an external capacitor in LFCSP and SOIC packages.
• Includes precision enable logic with programmable thresholds and hysteresis to prevent oscillation.
• Stable with small ceramic output capacitors, requiring only a minimum of 2.2 µF.

Applications

• Regulation for noise-sensitive applications such as ADC and DAC circuits.
• Powering precision amplifiers and VCO VTUNE control.
• Medical and healthcare equipment requiring stable analog rails.
• Industrial and instrumentation systems.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and thermal characteristics. Ensure that the selected component matches the required output voltage option and package type for your design. Confirm availability status through authorized distributors as supply levels may vary. Cross-reference the datasheet revision to ensure all electrical specifications align with your system requirements before finalizing procurement.

Selection Notes

Select the ADP7118ARDZ when a high input voltage range up to 20 V is required alongside low noise performance. Consider this component for designs needing precise enable control and adjustable soft-start timing. Evaluate the thermal resistance of the 8-lead SOIC package relative to your PCB layout and ambient temperature conditions. Ensure the application utilizes X5R or X7R dielectric capacitors to maintain stability and meet minimum capacitance requirements.

Part Context

The ADP7118 series includes various output voltage options and package types, including LFCSP and TSOT. The ARDZ designation specifically identifies the 8-lead SOIC package variant. This part belongs to a family of low dropout regulators designed for high-performance analog and mixed-signal circuits. Other variants in the series offer different fixed voltages or smaller footprints while maintaining similar electrical characteristics.

Replacement Considerations

Consult the official Analog Devices ordering guide for direct cross-references. Verify that any substitute maintains the 20 V maximum input rating and 200 mA output current capability. Ensure the replacement package is compatible with your existing PCB footprint or allows for necessary redesign adjustments.