SI3460-EVB: 48V @ 4W, 7W, or 15.4W, 11 ~ 16V in

The Si3460 is a single-port –48 V power management controller for IEEE 802.3af compliant Power Sourcing Equipment (PSE). The Si3460 operates directly from a 12 or 15 V isolated input supply and integrates a digital PWM-based dc-dc converter for generating the –48 V PSE output supply.

The negative polarity on the PSE supply provides safety-extra-low-voltage (SELV) compatibility with telephony ports in the same system.

The complete Si3460 reference design (i.e., the Si3460-EVB) also provides full IEEE-compliant classification and detection as well as a robust disconnect algorithm. Intelligent protection circuitry includes input under-voltage lockout (UVLO), current limiting, and output short-circuit protection.

The Si3460 is designed to operate completely independently of host processor control. A reset input and an optional LED status signal is provided to indicate the port status, including detect, power good and output fault event information for use within the host system.

The Si3460 is pin programmable to support:

• Endpoint and midspan applications, with support for either 10/100BASE-T or 10/100/1000BASE-T
  

• All four classification power levels specified by the IEEE 802.3 standard
  

• Classification-based current limiting
  

• Automatic or manual restart after various fault events are detected