ADM1281-3ACPZ-RL

Overview

The ADM1281-3ACPZ-RL is a low-voltage hot swap controller designed for safe insertion and removal of circuit boards from live backplanes. It features an integrated 12-bit ADC for monitoring current, power, voltage, and temperature via PMBus. The device includes an internal current sense amplifier measuring voltage across the detection resistor at HS+ and HS- pins. It operates within a supply voltage range of 4.5 V to 20 V and supports a working supply current of 5.5 mA. The component functions reliably between -40°C and +85°C in a 32-lead LFCSP package.

Feature Summary

• Integrated 12-bit ADC provides high-precision feedback for current, power, voltage, and temperature measurements accessible through the PMBus interface.
• Internal current sense amplifier measures load current by detecting voltage drops across the external detection resistor connected to HS+ and HS- pins.
• Configurable RETRY pin allows selection between automatic retry or latch-off modes during overcurrent fault conditions.

Applications

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

Procurement Notes

Verify availability status carefully as distribution channels may indicate limited supply or discontinuation. Confirm that the specific suffix matches project requirements for packaging and tape specifications. Ensure compatibility with existing thermal management designs given the LFCSP package constraints. Validate PMBus interface settings against system software expectations before finalizing procurement orders.

Selection Notes

Select this controller when precise power monitoring and programmable protection thresholds are required for low-voltage hot swap applications. Consider the integrated ADC capabilities if system-level telemetry is necessary without additional external sensors. Evaluate the constant power foldback feature for enhanced FET SOA protection compared to simpler limiters. Ensure the operating voltage range aligns with the target backplane specifications.

Part Context

This component belongs to the ADM1281 series of hot swap controllers from Analog Devices. It serves as a successor to older models like the ADM1278, offering improved accuracy and integrated monitoring features. The device is categorized under PMIC - Power Management ICs specifically for low-voltage hot swap control applications.

Replacement Considerations

The ADM1278 series has been discontinued. The ADM1281-1ACPZ-RL is listed as a direct replacement for certain ADM1278 variants. Verify pinout and functional compatibility when migrating from legacy parts to ensure seamless integration into existing designs.