ADM1281-2ACPZ

Overview

The ADM1281-2ACPZ is a low-voltage hot swap controller manufactured by Analog Devices Inc., designed for safe insertion and removal of circuit boards from live backplanes. It features an integrated 12-bit ADC for precise monitoring of current, power, voltage, and temperature via a PMBus interface. The device operates within a supply voltage range of 4.5 V to 20 V and supports a single channel. It utilizes an internal current sense amplifier with a default limit of 20 mV, adjustable between 5 mV and 25 mV. The component functions reliably across an operating temperature range of -40°C to +85°C and is housed in a 32-lead LFCSP package.

Feature Summary

• Provides high-precision feedback for current, power, voltage, and temperature using an integrated 12-bit ADC accessible via PMBus.
• Supports constant power foldback to enforce stricter FET Safe Operating Area (SOA) protection during fault conditions.
• Features programmable start-up current limiting and independent UV, OV, and PWRGD thresholds for customized power sequencing.
• Includes remote temperature detection with configurable warning and shutdown thresholds to monitor thermal health.

Applications

• Server systems requiring robust power management
• Power monitoring and control applications involving power budgeting
• Telecommunications and data communication equipment

Procurement Notes

Verify the specific suffix 'RL' against official Analog Devices documentation to confirm reel packaging requirements. Confirm availability status as distribution channels may indicate limited stock or factory special order constraints. Ensure compatibility with EVAL-ADM1281-AZ evaluation tools if development support is required. Cross-reference pinout and electrical specifications with the latest datasheet revision to avoid integration errors.

Selection Notes

Select this component when precise digital monitoring of hot-swap events is required alongside standard protection features. The integrated 12-bit ADC offers superior resolution compared to analog-only controllers. Consider the 32-lead LFCSP package size for space-constrained designs. Verify that the 4.5 V to 20 V input range aligns with the system's bus voltage. Evaluate the need for PMBus connectivity for centralized power management.

Part Context

The ADM1281 belongs to the ADM1281 series of low-voltage hot swap controllers from Analog Devices. It serves as a direct replacement for older models like the ADM1278, offering enhanced monitoring capabilities through its integrated ADC. The device is categorized under PMIC - Power Management ICs and is part of the broader portfolio of power protection solutions designed for high-reliability computing environments.

Replacement Considerations

The ADM1281 is documented as a direct replacement for the ADM1278. When substituting, verify that the target application supports the PMBus interface and the specific threshold accuracies provided by the ADM1281. Ensure that the PCB layout accommodates the 32-lead LFCSP package dimensions and thermal requirements specified in the datasheet.