Part Name
SI3461
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Silicon Laboratories
SI3461 Datasheet - Silicon Laboratories
Silicon Laboratories
Click, 396 11Description
The Si3461 is a single-port power management controller for IEEE 802.3at-compliant Power Sourcing Equipment (PSE). The Si3461 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.
Features
◾ IEEE 802.3atTM compliant PSE
◾ Autonomous operation requires
no host processor interface
◾ Complete reference design
available, including Si3461
controller and schematic:
• Low-cost BOM
• Compact PCB footprint
• Operates directly from a +50 V
isolated supply
• Supports up to 30 W maximum
output power (Class 4)
• Robust 3-point detection algorithm
eliminates false detection events
• IEEE-compliant disconnect
• Inrush current control
• Short-circuit output fault
protection
• LED status signal (detect,
power good, output fault)
◾ UNH Interoperability Test Lab
report available
◾ Extended operating range
(–40 to +85 °C)
◾ 11-Pin Quad Flat No-Lead
(QFN) package
• Tiny 3x3 mm PCB footprint;
RoHS-compliant
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
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