1 Features
1• Fully IEEE 802.3at Compliant
• Port Re-Mapping
• 1- and 3-Bit Fast Port Shutdown Input
• “Never Fooled” 4-Point Detection
• Type 1 and Type 2 PD Classification
• Programmable Current Limit With Foldback
• DC Disconnect Detection
• Flexible Processor Controlled Operating Modes
– Semiauto
– Manual
• 14-Bit Port Current and Voltage Monitoring
– 100-ms Rolling Port Current Averaging
– 2% Current Sensing Accuracy
– 0.255-Ω Sense Resistor With Kelvin Sense
• I2C Communication
– I2C Watchdog for Failsafe Operation
– 8- and 16-Bit Access Mode Selectable
• –40°C to 125°C Temperature Operation
• 56-Lead VQFN Package

2 Applications
• Enterprise Switches and Routers
• SoHo Switches and Routers
• PoE Pass-Through Power Modules
• Network Video Recorders (NVRs)

3 Description
The TPS2388 is an 8-channel power source
equipment (PSE) controller engineered to insert
power onto Ethernet cable according to IEEE
802.3at-2012 standard (or 802.3at). The PSE
controller can detect powered devices (PDs) that
have a valid signature, determine the power
requirements according to the classification, and
apply power through either one (Type -1) or twoevent
(Type-2) physical classification. The TPS2388
also has the flexibility to support UPoE and other
non-standard loads.
The Port remapping and the device pinout allow
designers to enable 2-layer PCB designs and simplify
software migration from previous generation PSE
devices. The external FET architecture allows
designers to further balance size, efficiency, thermal,
and solution cost requirements. The current foldback
reduces thermal stress on the external MOSFETs
during startup and overload conditions allowing the
use of cheaper FETs.
The Fast Shutdown (OSS) input provides up to eight
levels of per port shutdown priority for applications
that require the immediate disabling of multiple ports.