ADP7156ACPZ-1.8-R7

Overview

The ADP7156ACPZ-1.8-R7 is a fixed-output linear regulator providing 1.8 V at up to 1.2 A load current. It operates from an input voltage range of 2.3 V to 5.5 V with a typical dropout voltage of 120 mV at full load. The device features ultralow noise, delivering 0.9 µV rms integrated noise (100 Hz to 100 kHz) and 1.7 nV/√Hz spectral density (10 kHz to 1 MHz). Power supply rejection ratio reaches 80 dB from 1 kHz to 100 kHz. Quiescent current is 4.0 mA at no load and 7 mA at 1.2 A, with shutdown current as low as 0.2 µA. Initial output accuracy is ±0.6% at 25°C.

Feature Summary

• Ultralow noise architecture optimized for RF applications
• High power supply rejection ratio across wide frequency bands
• Precision enable pin with defined logic thresholds and hysteresis
• Stable operation with standard ceramic output capacitors

Applications

• Phase-locked loops (PLLs)
• Voltage controlled oscillators (VCOs)
• Communications infrastructure systems
• Backhaul and microwave links

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when confirming order details. Ensure the 1.8 V fixed output variant matches the system requirement, as the ADP7156 family offers multiple voltage options. Confirm the LFCSP package type aligns with PCB footprint specifications. Check for automotive qualification requirements if deploying in vehicle environments, as AEC-Q100 qualified versions exist within this series.

Selection Notes

Select this component for designs requiring minimal output noise and high PSRR in compact form factors. The 1.8 V output suits digital logic or analog front-ends needing clean power rails. Consider thermal dissipation capabilities given the 1.2 A maximum current rating. Verify input voltage headroom against the 120 mV typical dropout specification under expected load conditions. Evaluate capacitor ESR requirements to maintain loop stability with ceramic components.

Part Context

This part belongs to the ADP7156 series of radio frequency linear regulators manufactured by Analog Devices. The series includes variants with different output voltages and current ratings, such as the ADP7158 offering 2 A. These regulators utilize a proprietary architecture to achieve superior noise performance compared to standard LDOs. The family supports both fixed and adjustable output configurations across various packages including LFCSP and SOIC.

Replacement Considerations

Direct replacements include other ADP7156 variants with identical pinouts but different output voltages, such as ADP7156ACPZ-2.0-R7. For higher current needs, consider the ADP7158 series. Adjacent products like the ADM7155 offer similar noise profiles but with lower current capacity.