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Microchip Technology PD77728 8-Port PoE PSE Controller/Manager

Microchip Technology PD77728 8-Port PoE PSE Controller/Manager is part of Microchip’s seventh-generation IEEE® 802.3bt-compliant Power over Ethernet (PoE) Power Sourcing Equipment (PSE) family. This device is a fully integrated 8-port PoE controller, and PoE manager with integrated Field Effect Transistor (FET) switches and current sense resistors. Up to 12x devices can be cascaded to provide 48x 4-pair ports. According to IEEE, the device supports PoE Powered Device (PD) detection, classification, power-up, and protection, as well as legacy/pre-standard PD detection. The Microchip Technology PD77728 provides real-time protection through overload, under-load, over-voltage, over-temperature, short-circuit, and enables operation in standalone mode. The device is available in a 56-pin 8mm × 8mm QFN package.

Features

  • Supports IEEE 802.3bt standards
  • Supported PD types
    • Type 1, Type 2 PDs (802.3af, 802.3at)
    • Single-signature (Type 1–4) PDs
    • Dual-signature (Type 3 and 4) PDs
    • Pre-standard (legacy) 4-pair PDs
    • Supports non-compliant and legacy PDs
  • 4x operational modes
    • Controller mode in conjunction with PD77020 PSE Power Management Controller
    • Semi-auto mode
    • Managed auto mode
    • Unmanaged auto mode
  • Device
    • Stand-alone device supports up to 8x 2-pair ports or 4x 4-pair ports and any 4-pair/2-pair combination
    • Per-port integrated FET, sense resistor, and port diode
    • 160mΩ total port resistance
    • ≤2W device power dissipation at full load
    • Two power rails (55V and 3.3V) for maximum power efficiency
    • Guaranteed 4-pair output power of >90W
    • Over Supply Signal (OSS) support
    • AutoClass support
    • Supports fast and perpetual PoE
    • MarkHold function support
    • Host interface through I2C communication
  • Cascade up to 12x devices to support 96x 2-pair ports or 48x 4-pair ports and any 4-pair/2-pair combination
  • Real-Time Protection (RTP)
  • Measurements
    • Per-port voltage and current measurement
    • Accurate main power measurement
  • Surge
    • Surge up to 2kV without additional components per IEC61000-4-5-2014
    • Surge compliance, ITU-T K.21, GR1089, IE61000-4-5-2014, EN55024
      • Up to 10kV per IEC61000-4-5-2014
      • Up to 6kV per ITU-T K.21
  • Physical characteristics
    • –40°C to +85°C ambient temperature range
    • 56-pin 8mm × 8mm QFN package with thermal pad
    • Moisture Sensitivity Level (MSL) 3
    • RoHS compliant

Applications

  • Switches and routers for enterprise, small and medium business, SOHO, and commercial markets
  • Switches for the lighting market
  • PoE injectors

Specifications

  • 47.5W 2-pair power
  • 95W 4-pair power
  • 1.185A maximum current
  • 2.0W maximum power dissipation
  • 0.160Ω typical total channel resistance
  • 50kΩ to 70kΩ port resistance range
  • 47nF to 22nF port capacitance range
  • 100W maximum supported output power
  • 65ms typical inrush time
  • 8 ports

Typical PoE Application

Application Circuit Diagram - Microchip Technology PD77728 8-Port PoE PSE Controller/Manager

Block Diagram

Block Diagram - Microchip Technology PD77728 8-Port PoE PSE Controller/Manager

Resources

Related Development Tool

Microchip Technology EV71C64A Auto Mode Evaluation Board

Built on the PD77728 PoE controller/manager, showcasing four IEEE 802.3bt 4-pair ports.

Learn Moreabout Microchip Technology EV71C64A Auto Mode Evaluation Board View Productsrelated to Microchip Technology EV71C64A Auto Mode Evaluation Board

Related Products

Microchip Technology PD77020 PoE Power Management Controller

This device is based on a SAMD21 controller and provides multi-port PoE functions.

Learn Moreabout Microchip Technology PD77020 PoE Power Management Controller View Productsrelated to Microchip Technology PD77020 PoE Power Management Controller
Published: 2024-06-07 | Updated: 2024-08-29