Description
PD70211 is an advanced PD Interface IC with
integrated switching (PWM) regulator control for
Powered Devices in PoE applications. It supports
IEEE802.3af, IEEE802at, HDBaseT and 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
which of the four pairs of the cable actually receives
power and generates appropriate flags.
The IC features an internal bleeder for discharging the
input capacitor of the DC/DC converter rapidly, so as
to ensure fast re-detection and port power-up in case
of sudden removal and re-insertion of the Ethernet
cable into the RJ-45. The advanced PWM currentmode
section supports synchronous Flyback and Active
clamp Forward topologies, as well as Buck, Boost etc.

Features
 Supports IEEE802.3af/at, HDBaseT and other 2-
pair/4-pair configurations
 Wall-adapter support (Rear Aux method)
 PD detection & programmable classification
 2,3,4, and 6 event classification
 Integrated 0.3Ω isolating (series-pass) FET
 Inrush current limiting
 Less than 10μA offset current during detection
 Advanced PWM section
 Lead-free MLPQ-36 (6 × 6 mm) package

Applications
 HDBaseT up to 95 Watts
 IEEE802.3af and 802.3at
 Power Forwarding
 Indoor and outdoor PoE