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SI3454

QUAD IEEE 802.3AT POE PSE CONTROLLER

Silicon Laboratories 

Si3454

QUAD IEEE 802.3AT POE PSE CONTROLLER

Features

 Quad-Port Power Sourcing

Equipment (PSE) controller

 IEEE 802.3at Type I and II

compliant

 Port priority shutdown control

 Adds enhanced features for

maximum design flexibility:

Per-port current and voltage

monitoring

PoE Plus support with

programmable current limits

Multi-point detection

Programmable power MOSFET

gate drive control

Configurable watchdog timer

enables failsafe operation

 Maskable interrupt pin

 Comprehensive fault protection

circuitry includes:

Power undervoltage lockout

Output current limit and short-

circuit protection

Thermal overload detection

 Supports pin-selectable

AUTO mode

 Extended operating temp range:

–40 to +85 °C

 5x7 mm 38-pin QFN package

(RoHS-compliant)

 On-chip dc-dc converter enables

single-rail power operation

Applications

 IEEE Power Sourcing Equipment  IP Phone Systems

(PSE)

 Smartgrid Switches

 Power over Ethernet (PoE)

Switches

 Ruggedized and Industrial

Switches

Description

The Si3454 is a fully-programmable, four-port power management

controller for IEEE 802.3 compliant Power Sourcing Equipment (PSE).

Designed for use in PSE endpoint (switches), the Si3454 integrates four

independent ports, each with IEEE-required powered device (PD)

detection and classification functionality. In addition, the Si3454 features a

fully-programmable architecture that enables powered device (PD)

disconnect using a dc sense algorithm, a robust multipoint detection

algorithm, software-configurable per-port current and voltage monitoring,

and programmable current limits to support the IEEE 802.3at standard.

Intelligent protection circuitry includes input undervoltage detection,

output current limit, and short-circuit protection. The Si3454 operates by

host processor control through a three-wire, I2C-compatible serial

interface. Independent serial data input and output pins enable high-

voltage isolation through external isolators. An interrupt pin is used to

alert the host processor of various status and fault conditions. The device

also supports a pin-selectable AUTO mode for autonomous operation,

without the need for a host processor. The Si3454 also features an on-

chip dc-dc converter for creating the digital voltage rail from the PoE

voltage, thus enabling single-rail power operation.

Ordering Information:

See page 49.

Rev. 1.1 9/15

Copyright © 2015 by Silicon Laboratories

Si3454

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