Si3462
SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE
Features
IEEE 802.3atTM compliant PSE
Short-circuit outpu...
Si3462
SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE
Features
IEEE 802.3atTM compliant PSE
Short-circuit output fault
Autonomous operation requires no
protection
host processor interface
LED status signal (detect,
Complete reference design
power good, output fault)
available, including Si3462 controller UNH Interoperability Test Lab
and schematic:
report available
Low-cost BOM
Extended operating range
Compact PCB footprint
(–40 to +85 °C)
Operates directly from a +50 V 11-Pin Quad Flat No-Lead (QFN)
isolated supply
package
Supports up to 30 W maximum
Tiny 3x3 mm PCB footprint;
output power (Class 4)
RoHS-compliant
Robust 3-point detection algorithm No-classify modes force power
eliminates false detection events
after valid detection
IEEE-compliant disconnect
Eliminates 10 BOM
Inrush current control
components
Applications
IEEE 802.3at endpoints and midspans
Environment A and B PSEs Embedded PSEs
Set-top boxes FTTH media converters Cable modem and DSL gateways
Description
The Si3462 is a single-port power management controller for IEEE 802.3atcompliant Power Sourcing Equipment (PSE). The Si3462 can be powered from a 50 V input using a shunt
regulator, or, to save power, it can be powered from 50 V and 3.3 V power supplies. The IEEE-required Powered Device (PD) detection feature uses a robust 3-point algorithm to avoid false detection events. The Si3462's reference design kit also provides ful...