PM8803C

Overview

The PM8803C is a Power over Ethernet (PoE) controller from STMicroelectronics, designed for Powered Devices (PD). It integrates an IEEE 802.3at compliant PoE interface with a current-mode PWM controller to simplify power supply design. The device supports flyback, forward, and synchronous rectification topologies. Key electrical parameters include a maximum power output of 25.5 W, a 100 V internal hot-swap MOSFET with 0.45 Ω on-resistance, and a typical inrush current limit of 140 mA. It operates within a temperature range of -40°C to +85°C and is housed in a 20-HTSSOP package.

Feature Summary

• Integrates IEEE 802.3at Layer 1 hardware classification and detection logic
• Includes an integrated 100 V, 0.45 Ω, 1 A hot-swap MOSFET
• Features a programmable current-mode PWM controller with adjustable oscillator frequency
• Supports auxiliary source priority over PoE input

Applications

• IEEE 802.3at (PoE+) Powered Device power supply sections
• Industrial and power conversion systems requiring simplified PD design
• Gigabit Ethernet interfaces with integrated power management

Procurement Notes

Verify the specific suffix 'C' against the official datasheet to confirm package and tape/reel specifications, as distributor listings may vary. Confirm RoHS3 compliance status directly with the manufacturer documentation before finalizing procurement orders. Ensure the selected packaging format matches your assembly line requirements.

Selection Notes

Select this component when designing a single-channel PoE+ Powered Device that requires integrated classification and DC-DC control. It is suitable for applications needing auxiliary power source priority and support for various converter topologies including flyback and forward converters. Verify thermal performance requirements align with the HTSSOP package capabilities.

Part Context

The PM8803C belongs to the PM880x family of Power Over Ethernet ICs by STMicroelectronics. This family integrates PoE interface functions and current-mode PWM controllers into a single chip to streamline Powered Device designs. The series complies with IEEE 802.3af and 802.3at standards, offering detection, classification, and inrush current limiting features.

Replacement Considerations

The PM8803TR is a pin-compatible variant of the same device family, differing primarily in packaging configuration (Tape & Reel vs. Tray). Both share identical functional specifications and electrical characteristics.