Texas Instruments TPS23861 - QUAD IEEE 802.3at Power-Over-Ethernet PSE
The TPS23861 is a flexible IEEE802.3at Power-Over-Ethernet PSE solution that automatically manages four 802.3at ports without the need for any external control.
- Pin-Out Enables Two-Layer PCB
- Kelvin Current Sensing
- 4-Point Detection
- -40°C to 125°C Temperature Range
- TSSOP28 Package 9.8 mm x 6.6 mm
Product Description
The TPS23861 is a flexible IEEE802.3at PSE solution that automatically manages four 802.3at ports without the need for any external control.
The TPS23861 automatically detects Powered Devices that have a valid signature. It then determines power requirements according to classification and applies power.
It also supports two-event classification for type-2 PDs. The TPS23861 supports DC disconnection and the external FET architecture allows designers to balance size efficiency and solution cost requirements.
It has a unique pin-out enabling two-layer PCB designs via logical grouping and clear upper and lower differentiation of I2C and power pins. This delivers best-in-class thermal performance Kelvin accuracy and low-build cost.
The TPS23861 also supports a semi-automatic mode via I2C control for precision monitoring and intelligent power management. The 400-ms TPON specification is met whether in semi-automatic or automatic mode.
Applications
Ethernet Switches and Routers Surveillance NVR and DVRs Residential Gateways PoE Pass-Through Systems and Wireless Backhaul.
Controller features
IEEE 802.3at Quad Port PSE; Auto Detect Classification; Auto Turn-On and Disconnect; Efficient 255-mΩ Sense Resistor.
Operating modes
Automatic (As Shipped): No External Terminal Setting Required; No Initial I²C Communication Required. Semi-Automatic (Set by I²C Command): Continuous Identification and Classification; Meets IEEE 400-ms TPON Specification; Fast-Port Shutdown Input.