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.