LM5073 Datasheet, PDF (1/20 Pages) Texas Instruments – 100V Power Over Ethernet PD Interface

March 2007
LM5073
100V Power Over Ethernet PD Interface with Aux Support
General Description
The LM5073 Powered Device (PD) interface provides a high
performance solution that is fully compliant to IEEE 802.3af
for a PD connecting into Power over Ethernet (PoE) networks.
The LM5073 provides the flexibility for the PD to also accept
power from unregulated auxiliary sources such as AC
adapters and solar cells in a variety of configurations. The low
R_DS(ON) PD interface hot swap MOSFET and programmable
DC current limit extend the range of LM5073 applications up
to twice the power level of IEEE 802.3af compliant devices.
The 100V maximum voltage rating simplifies selection of the
transient voltage suppressor that protects the PD from net-
work transients. Control outputs for a separate DC-DC con-
verter are provided to allow freedom to select the best DC-DC
converter topology for the particular application.
Features
PD Interface
■ ^{Fully Compliant IEEE 802.3af PD Interface}
■ ^{Versatile Auxiliary Power Options}
■ ^{13V Minimum Front Auxiliary Power Range}
■ ^{9V Minimum Rear Auxiliary Power Range}
■ ^{Programmable DC Current Limit up to 800 mA}
■ ^{100V, 0.7Ω Hot Swap MOSFET}
■ ^{Integrated PD Signature Resistor}
■ ^{Integrated PoE Input UVLO}
■ ^{Inrush Current Limit}
■ ^{PD Classification Capability}
■ ^{Thermal Shutdown Protection}
■ ^{Line Over Voltage Protection}
■ ^{Complementary Open Drain Outputs for Controlling a DC-}
DC Converter
■ ^{Power Good Indicator}
Applications
■ ^{IEEE 802.3af Compliant PoE Powered Devices}
■ ^{Non-Compliant, Application Specific Devices}
■ ^{Higher Power Ethernet Powered Devices}
Packages
■ ^{TSSOP-14 EP (Exposed Pad)}
Simplified Application Diagram
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