• IEEE 802.3af/at Power over Ethernet (PoE) PSE Controller
• Four Independent PSE Channels
• Up to 70W per Port for High Power PSE application
• 0.25Ω Current-Sensing Resistor
• High Capacitance Legacy Device Detection
• 400kHz I2C Compatible Serial Control Interface
• 9-Bit Port Current and Voltage Monitoring
• Supports DC Load Disconnect Detection
• Wide Junction Temperature Range (-40℃ to 125℃)
• Over Temperature Protection
• Available in QFN5× 5_32 Package

The SQ24908A is an IEEE 802.3af/at-compliant Power over Ethernet (PoE) PSE controller. External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heatsinks even at Type 2 power levels. External power components also allow use at very high-power levels while remaining otherwise compatible with the IEEE standard.

The SQ24908A supports single-supply operation, provides up to 70W to each port (Class 5 and EN_HP enabled), and still provides high-capacitance detection for legacy PDs. The device features an I2C-compatible, 3-wire serial interface, and is fully software configurable and programmable. The device provides instantaneous readout of port current and voltage through the I2C interface. The device’s extensive programmability enhances system flexibility, enables field diagnosis, and allows for uses in other, nonstandard applications.

The SQ24908A is available in QFN5x5_32 package.