PD70224

Introduction

PD70224 is a dual pack of MOSFET-based full-bridge rectifiers. It contains low-RDS 0.16 Ω N-channel MOSFETs for

much higher overall efficiency and higher output power, particularly when used in Powered Devices for Power over

Ethernet (PoE) applications. The entire drive circuitry for driving the MOSFETs is on-chip, including a charge pump

rectifier is only 192 mV at 0.6 A, compared to a standard bridge rectifier that typically presents 2000 mV of forward

drop.

4), IEEE 802.3at and IEEE 802.3af (Type 1 and Type 2). The PD70224 also supports legacy 4 pair standards such as

UPoE (60 W) and POH (Power over HDBase-T, 95 W)..

In addition, PD70224 is capable of helping to identify at the physical layer itself whether a 2-pair PSE or a 4-pair PSE

is providing power over the cable. It does that by sensing the voltage on the line (un-rectified) side of the pairs.

Features

• Active circuit with low forward-drop to replace dissipative passive diode bridges

• Self-contained drive circuitry for MOSFETs

• Designed to support IEEE 802.3af/at/bt, Universal PoE (UPOE), and Power over HDBase-T (PoH)

• Integrated 0.16 Ω N-Channel MOSFETs for 0.32 Ω total path resistance

• “Power present” indicator signals for identifying 4-pair bridge power

• Dedicated pin to implement adapter priority

• Low leakage, <10 μA during detection

• Wide operating voltage range up to 57 V

• -40 °C to 85 °C ambient

• Available in 40-pin package

• MSL3, RoHS compliant

Applications

• Power over Ethernet IEEE 802.3bt/at/af

• Proprietary 4-pair standards, UPOE, and POH

Datasheet

DS00003575C-page 1