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TMI7608R

8-Port IEEE 802.3af/at PSE Controller for Power-over-Ethernet

产品详细信息

特性
说明

·IEEE 802.3af/at compliant 

·Single DC power supply voltage input  (44~57V)  

·Supplies 8 independent power ports 

·Supports DC Load-Removal Detections 

·Built-in power FETs 

·0.1Ω Sense embedded 

·Up to 50W per Port for PSE Applications 

·Wide temperature range: -40°C ~+85°C 

·9-Bit Port Current and Voltage Monitoring 

·I 2C Bus to access up to 8 x TMI7608R  devices 

·Independent system parameters setting for  every port 

·Thermal monitoring and protection 

·Built-in 3.3V regulators for external devices 

·Built-in Power on Reset 

·Configurations: 30W x 8ports 

·Built-in LEDs control for multi-port use 

·Built-in EEPROM interface for dumb  application 

·Direct or Shift Overload LED 

·Pin Selectable Detection Backoff Timer for  ALT_A/B 

·2-Event Pin-Select 

·Support 24V low voltage application 

·Pin Programmable Maximum Total current  limit for Smart power management.  

·Robust Short-Circuit Protection 

·Space-Saving,48-Pin MQFN (7mm x 7mm)  Power Package

TMI7608R is an 8-port PSE (Power Sourcing  Equipment) controller IC for PoE (Power over  Ethernet) systems. It integrates power, analog and  logic circuits into a single chip, and can be used for  Midspans and Endpoint PSE applications.  TMI7608R meets all IEEE 802.3AF-2003  requirements, such as multi-point resistor detection,  PD classification, DC Disconnect, and Back-off for  Midspans. It also meets all IEEE 802.3AT-2009  requirements, such as two-event classification and  supply maximum 36W per port. The device also  supports Class 5 for detection and classification of  high-power PDs. The device supports singlesupply operation, provides up to 50W to each port  (Class 5 enabled). TMI7608R comprises internal temperature  monitoring and thermal protection to protect  against junction overheating. TMI7608R has a maximum power setting pin.  Connect a resistor from this pin to AGND to set the  total power capability on all 8 output ports.  TMI7608R will limit the total power on 8 ports below  this power limit. The 3.3V regulator is built-in to support external  devices. Multiple TMI7608Rs can integrate to build  an 8 x N ports PSE system, and I2C bus uses to  collect PD power status from each TMI7608R to  support global power managements. Management  switch host has options to communicate TMI7608R  via I2C bus for PSE management activities.  Optocouplers can be implemented to provide  electrical isolations between the host and  TMI7608R for signal communication.

TMI7608R
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TMI7608R

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