TMI7608S

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

数据表

TMI7608S_DS_EN_V0.3

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

· I²C Bus to access up to 8 x TMI7608S 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

· 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,56-Pin QFN (8mm x 8mm) Power Package

TMI7608S 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. TMI7608S 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 Class4+ for detection and classification of high-power PDs. The device supports singlesupply operation, provides up to 50W to each port (Class4+ enabled). TMI7608S comprises internal temperature monitoring and thermal protection to protect against junction overheating. TMI7608S 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. TMI7608S will limit the total power on 8 ports below this power limit. The 3.3V regulator is built-in to support external devices. Multiple TMI7608Ss can integrate to build an 8 x N ports PSE system, and I2C bus uses to collect PD power status from each TMI7608S to support global power managements. Management switch host has options to communicate TMI7608S via I2C bus for PSE management activities. Optocouplers can be implemented to provide electrical isolations between the host and TMI7608S for signal communication