Número de pieza
SI3453
componentes Descripción
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Fabricante
Silicon Laboratories
SI3453 Hoja de datos - Silicon Laboratories
Silicon Laboratories
Description
When connected directly to the host system or configured in Auto mode, each Si3452/3 high-voltage port controller provides all of the critical circuitry and sophisticated power measurement functionality for the high-voltage interfaces of four complete PSE ports. The Si3452/3 fully integrates robust, low-RON (0.3 typical) power MOSFET switches, low-power dissipation current sensing circuitry, and transient voltage surge suppression devices.
Features
◾ Each Si3452/3 high-voltage port
controller supports four PSE power
interfaces
◾ Programmable current limits for PoE
(15.4 W), PoE+ (30 W), and
proprietary systems (up to 40 W) per
port
◾ I2C interface requires no external
MCU for easy, low-cost management
of 4 to 48 ports by the host system
◾ Unique mixed-signal IC high-voltage
component integration simplifies
design, lowers power dissipation,
minimizes external BOM, and
reduces PCB footprint
• Internal low-RON power FETs with
current-sense circuitry
• Integrated transient voltage surge
suppressors
• DC disconnect (Si3453) or
proprietary dV/dt disconnect
(Si3452) sensing methods
◾ Programmable architecture supports
IEEE 802.3af (PoE) and IEEE
802.3at (PoE+) PSEs
• Programmable current limits for
PoE (350 mA) and PoE+
(600 mA), and custom limits to
850 mA
• Per-port current and voltage
monitoring for sophisticated power
management and control
• Power policing mode
• Robust multi-point detection
• Supports 1-Event and 2-Event
classification algorithms
◾ Comprehensive, robust, faultprotection circuitry
• Supply under-voltage lockout
(UVLO)
• Output current limit and shortcircuit protection
• Foldback current limiting
• Dual-threshold thermal overload
protection
• Fault source reporting for
intelligent port management
◾ Extended commercial (–10 to 85 °C)
and industrial (–40 to 85 °C)
operating temperatures
◾ Compact, 6×6 mm2, 40-pin QFN
RoHS-compliant package
Applications
◾ Power over Ethernet Endpoint
switches and Midspans for IEEE Std
802.3af and 802.3at
◾ Supports high power PDs, such as:
• Pan/Tilt/Zoom security cameras
• 802.11n WAPs
• Multi-band, multi-radio WAPs
◾ Security and RFID systems
◾ Industrial automation systems
◾ Networked audio
◾ IP Phone Systems and iPBXs
◾ Metropolitan area networked WAPs,
cameras, and sensors
◾ WiMAX ASN/BTS and CPE/ODU
systems
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