Controller doubles scope for Power over Ethernet

National Semiconductor has introduced the LM5073, an enhanced Power over Ethernet (PoE) controller capable of delivering more than twice the 15W maximum power defined in the IEEE802.3af PoE standard.

This allows new types of applications to benefit from the convenience of PoE, including networked security and access control systems.

The LM5073 extends the standard PoE capabilities safely, by allowing the current limit to be adjusted up to 800mA and by implementing a 100V-rated hot-swap MOSFET with ultra-low on-resistance of 0.7Ω.

The 100V maximum voltage rating simplifies selection of the transient voltage suppressor that protects the Powered Device (PD) from network transients.

Control outputs are provided for a separate DC/DC converter to allow selection of the most suitable topology for the application, such as a non-isolated buck converter or isolated PWM controller. The LM5073 also provides the flexibility for the PD to accept power from unregulated auxiliary sources such as AC adapters and solar cells in a variety of configurations.

 

FEATURES Integrated PD-signature resistor Integrated PoE input UVLO Inrush-current limit PD-classification capability Power-Good pin 14-pin, exposed-pad TSSOP package

APPLICATIONS Remote security cameras Card readers Point-Of-Sale (POS) terminals PoE enabled industrial automation systems

 

National Semiconductor/LM5073