PD70211

PD Controller with Switching Regulator for AF/AT/UPOE/

HDBaseT/4-pair PoE Applications

Product Overview

Microchip's PD70211 is an advanced PD interface IC with integrated switching Pulse-Width Modulation (PWM)

regulator control for powered devices in PoE applications. It supports IEEE

general 2/4-pair configurations.

The PD70211 front-end includes an advanced classification block that supports 2, 3, 4, and 6 event classification.

Using the SUPP_Sx pins, it also identifies the four pairs of cable that actually receive power and generate

appropriate flags.

The IC features an internal bleeder for discharging the input capacitor of the DC/DC converter rapidly to ensure fast

re-detection and port power-up, in case of a sudden removal and re-insertion of the Ethernet cable into the RJ-45.

The advanced PWM current-mode section supports synchronous Flyback and Active Clamp Forward topologies, as

well as Buck, Boost, and so on.

Features

The PD70211 device has the following key features.

• Supports IEEE 802.3af/at, HDBaseT, and other 2-pair/4-pair configurations

• Wall adapter support (Rear Aux method)

• PD detection and programmable classification

• 2, 3, 4, and 6 event classification

• Integrated 0.3Ω isolating (series-pass) FET

• Inrush current limiting

• Less than 10 µA offset current during detection

• Advanced PWM section

• Lead-free QFN-36 (6 mm × 6 mm) package

Datasheet

DS00003672A-page 1