TMI7604R

TMI7604R is an 4-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. TMI7604R 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). TMI7604R comprises internal temperature monitoring and thermal protection to protect against junction overheating. TMI7604R has a maximum power setting pin. Connect a resistor from this pin to AGND to set the total power capability on all 4 output ports. TMI7604R will limit the total power on 4 ports below this power limit. The 3.3V regulator is built-in to support external devices. Multiple TMI7604Rs can integrate to build an 4xN ports PSE system, and I²C bus uses to collect PD power status from each TMI7604R to support global power managements. Management switch host has options to communicate TMI7604R via I²C bus for PSE management activities. Optocouplers can be implemented to provide electrical isolations between the host and TMI7604R for signal communication.

Applications

• PSE-ICM
• Power-Sourcing Equipment (PSE)
• Switches/Routers
• ALT_A/B Power Injectors

Key features

• IEEE 802.3af/at compliant
• Single DC power supply voltage input (44~57V)
• Supplies 4 independent power ports
• Supports DC Load-Removal Detections
• Built-in power FETs
• 0.1Ω Sense embedded
• Wide temperature range: -40°C~+85°C
• 9-Bit Port Current and Voltage Monitoring
• I²C Bus to access up to 8 x TMI7604R devices
• Independent system parameters setting for every port
• Thermal monitoring and protection
• Built-in 3.3V regulators for external devices
• Up to 50W per Port for PSE Applications
• Configurations: 30W x 4ports
• 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
• Pin Programmable Maximum Total current limit for Smart power management
• Robust Short-Circuit Protection
• Space-Saving, 48-Pin QFN (7mm x 7mm) Power Package