+FAUX

-PoE

-FAUX

+

VOUT

-

VIN

UVLO

VEE

nSD

nPGOOD

SD

RTN

UVLORTN

DCCL

RCLASS

FAUX

RAUX

VIN

SD

GND

0.1 PF

LM5073

DC-DC

CONVERTER

+PoE

LM5073

www.ti.com

SNVS490C – MARCH 2007 – REVISED APRIL 2013

LM5073 100V Power Over Ethernet PD Interface with Aux Support

Check for Samples: LM5073

1

FEATURES

DESCRIPTION

The LM5073 Powered Device (PD) interface provides

2

PD Interface

a high performance solution that is fully compliant to

•

Fully Compliant IEEE 802.3af PD Interface

IEEE 802.3af for a PD connecting into Power over

•

Versatile Auxiliary Power Options

Ethernet (PoE) networks. The LM5073 provides the

flexibility for the PD to also accept power from

•

13V Minimum Front Auxiliary Power Range

unregulated auxiliary sources such as AC adapters

•

9V Minimum Rear Auxiliary Power Range

and solar cells in a variety of configurations. The low

•

Programmable DC Current Limit up to 800 mA

programmable DC current limit extend the range of

•

100V, 0.7

Ω Hot Swap MOSFET

LM5073 applications up to twice the power level of

•

Integrated PD Signature Resistor

IEEE 802.3af compliant devices. The 100V maximum

•

Integrated PoE Input UVLO

voltage rating simplifies selection of the transient

voltage suppressor that protects the PD from network

•

Inrush Current Limit

transients. Control outputs for a separate DC-DC

•

PD Classification Capability

converter are provided to allow freedom to select the

•

Thermal Shutdown Protection

best DC-DC converter topology for the particular

•

Line Over Voltage Protection

application.

•

Complementary Open Drain Outputs for

Packages

Controlling a DC-DC Converter

•

HTSSOP-14 EP (Exposed Pad)

•

Power Good Indicator

APPLICATIONS

•

IEEE 802.3af Compliant PoE Powered Devices

•

Non-Compliant, Application Specific Devices

•

Higher Power Ethernet Powered Devices

Simplified Application Diagram

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.