PM8801

Overview

The PM8801 is a high-efficiency, IEEE 802.3at compliant integrated Power over Ethernet (PoE) interface and PWM controller designed for Powered Devices (PD). It combines a standard-compliant PoE/PoE+ interface with a current-mode PWM controller to simplify power supply design. Key electrical parameters include a 48 V operating supply voltage, a maximum on-resistance of 1 Ohm, and a typical DC current limit of 640 mA. The device operates within a temperature range of -40°C to +85°C and features an integrated 100 V, 0.45 Ω, 1 A hot-swap MOSFET. It supports flyback, forward, and synchronous rectification topologies.

Feature Summary

• Integrates IEEE 802.3at compliant PoE interface with Layer 1 hardware classification and detection functions
• Combines PoE management with a programmable current-mode PWM controller for flexible DC/DC conversion
• Supports dual power sources from Ethernet cables or external auxiliary supplies with automatic source precedence
• Includes internal protection mechanisms such as undervoltage lockout, inrush current limitation, and thermal sensing

Applications

• VoIP phones
• Wireless LAN access points
• Industrial IoT powered devices
• Networked security cameras

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors due to the presence of End-of-Life status indicators in some marketplaces. Confirm package integrity upon receipt, as the HTSSOP-24 form factor requires careful handling during inspection. Ensure that any replacement sourcing strictly adheres to the original datasheet specifications to maintain system compliance with IEEE 802.3at standards.

Selection Notes

Select this component for designs requiring strict adherence to IEEE 802.3at Type 2 PD classifications. It is suitable for applications needing simultaneous support for PoE and local auxiliary power inputs. The integrated MOSFET and PWM controller reduce external component count. Verify compatibility with specific converter topologies such as flyback or synchronous rectification before finalizing the bill of materials.

Part Context

The PM8801 belongs to STMicroelectronics' portfolio of PoE controllers aimed at simplifying powered device development. It addresses the need for compact, efficient power solutions in networked electronics by integrating critical analog and digital control functions into a single HTSSOP-24 package, reducing board space and design complexity.

Replacement Considerations

PM8803 is listed as a potential manufacturer substitute.