Texas Instruments TPS23851DCER

Description
The TPS23851 is a quad-power controller designed to insert power onto Ethernet cables according to IEEE Std 802.3at-2009 (or 802.3at) for Power Sourcing Equipment (PSE). The PSE controller can detect Powered devices (PDs) that have a valid signature, determine the power requirements of the devices according to the classification, and apply power to the devices, limited per 802.3at. Based on an industry-standard register set, the PSE controller is software compatible with other PSE controllers for basic functionality.

Features
Fully IEEE Std 802.3at-2009 Compliant
Four Independent PSE Ports
PD Detection and Classification
Current Limit Output Protection with Foldback for Reduced Cost FET
AC and DC Disconnect Detection
I²C Communication
4 Bit Address for 64-Port Systems
Flexible Operation Modes
Automatic
Semi Automatic
Processor Controlled
Pin Compatible with LTC4259A & MAX5952/MAX5945/MAX5935
Enhanced Features
Never Fooled 4-Point Detection
Onboard Precision 110-Hz AC Disconnect Sine Wave Oscillator
F²C Watchdog for Failsafe Operation
Individual and Multiplexed Port Shutdown Modes
Per Port A/D Converters
14-Bit Resolution for Precision Measurements
Typical Application
Real-time Voltage Monitoring
Real-time Current Monitoring
Inherent Filtering
Extended -20°C to 125°C Temperature Operation
802.3at Type 2 Mode
High-Power Mode
Classification through Link Layer Discovery Protocol (LLDP)
Available in 36-lead SSOP Package

Applications
Ethernet Switches and Routers