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LM5073 Dataheets PDF



Part Number LM5073
Manufacturers National Semiconductor
Logo National Semiconductor
Description 100V Power Over Ethernet PD Interface
Datasheet LM5073 DatasheetLM5073 Datasheet (PDF)

LM5073 100V Power Over Ethernet PD Interface with Aux Support 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 configura.

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LM5073 100V Power Over Ethernet PD Interface with Aux Support 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 RDS(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. ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 DCDC Converter ■ Power Good Indicator Applications ■ IEEE 802.3af Compliant PoE Powered Devices ■ Non-Compliant, Application Specific Devices ■ Higher Power Ethernet Powered Devices 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 Packages ■ TSSOP-14 EP (Exposed Pad) Simplified Application Diagram 30000201 © 2007 National Semiconductor Corporation 300002 www.national.com LM5073 Connection Diagram 30000202 14 Lead TSSOP-EP Ordering Information Order Number LM5073MH LM5073MHX Package Type TSSOP-14EP TSSOP-14EP NSC Package Drawing MXA14A MXA14A Supplied As 94 Units per Rail 2500 Units on Tape and Reel Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name UVLORTN UVLO VIN RCLASS FAUX DCCL VEE NC RTN NC nPGOOD nSD SD RAUX EP Description Return for the external UVLO programming resistor divider. Line under-voltage lockout programming pin. Positive supply pin for the PD interface and the DC-DC converter interface. PD Classification programming pin. Front auxiliary power enable pin. PD interface DC current limit programming pin. Negative supply pin for the PD interface; connected to PoE and/or front auxiliary power return path. No internal connection. DC-DC converter power return; connected to the drain of the internal PD interface hot swap MOSFET. No internal connection. PD interface power good delay and indicator. nPGOOD is low when the hot swap MOSFET drain to source voltage is less than 1.5V. Open drain, active low shut down signal to the DC-DC converter. The nSD pin switches to the high impedance state when nPGOOD is less than 2.5V. Open drain, active high shut down signal to the DC-DC converter. The SD pin switches to the low state when nPGOOD is less than 2.5V. Rear auxiliary power enable pin, and dominant/non-dominant selection. Exposed metal pad on the underside of the device. It is recommended to connect this pad to a PC Board plane connected to the VEE pin to improve heat dissipation. www.national.com 2 LM5073 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN, FAUX, UVLO, RTN to VEE (Note 6) UVLORTN to VEE DCCL, RCLASS to VEE nPGOOD, nSD, SD to RTN RAUX to RTN       -0.3V to 100V -0.3V to 16V -0.3V to 7V -0.3V to 16V -0.3V to 100V         ESD Rating Human Body Model (Note 2) Lead Soldering Temp. (Note 3) Wave (4 seconds) Infrared (10 seconds) Vapor Phase (75 seconds) Storage Temperature Junction Temperature   2000V 260°C 240°C 219°C -55°C to 150°C 150°C Operating Ratings VIN voltage Operating Junction Temperature 9V to 70V -40°C to 125°C Electrical Characteristics (Note 4) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. VIN = 48V unless otherwise indicated. (Note 3) SYMBOL Supply Current VIN Supply Current Detection and Classification VIN Signature Startup Voltage Signature Resistance Signature Resistor Disengage / Classification Engage Hysteresis Classification Current Turn Off RCLASS Voltage Supply Current During Classification Line Under Voltage Lock-Out Default UVLO Release Default UVLO Lock out Default UVLO Hysteresis Programmed UVLO Reference Voltage Programmed UVLO Hysteresis Current UVLORTN Pull Down Resistance UVLO Filter Power Goo.


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