TPS2388 Power Source Equipment (PSE) Controller

TPS2388 Power Source Equipment (PSE) Controller

Texas Instruments' TPS2388 is an 8-channel (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 two-event (Type-2) physical classification. The TPS2388 also has the flexibility to support Universal Power over Ethernet (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.

Features
  • Fully IEEE 802.3at compliant
  • Port remapping
  • 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
Applications
  • Enterprise switches and routers
  • SoHo switches and routers
  • PoE pass-through power modules
  • Network video recorders (NVRs)

New Products:

TPS2388RTQT
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