LM5073_14 Datasheet, PDF (1/27 Pages) Texas Instruments – 100V Power Over Ethernet PD Interface with Aux Support

LM5073
www.ti.com
SNVS490B – MARCH 2007 – REVISED FEBRUARY 2010
LM5073 100V Power Over Ethernet PD Interface with Aux Support
Check for Samples: LM5073
FEATURES
1
2PD 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
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 network
transients. Control outputs for a separate DC-DC
converter are provided to allow freedom to select the
best DC-DC converter topology for the particular
application.
Packages
• HTSSOP-14 EP (Exposed Pad)
APPLICATIONS
• IEEE 802.3af Compliant PoE Powered Devices
• Non-Compliant, Application Specific Devices
• Higher Power Ethernet Powered Devices
Simplified Application Diagram
+PoE
+FAUX
0.1 PF
-FAUX
-PoE
LM5073
VIN
UVLO
UVLORTN
RCLASS
RAUX
SD
nSD
FAUX
DCCL
nPGOOD
VEE
RTN
VIN
SD
DC-DC
CONVERTER
+
VOUT
-
GND
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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