GreenEdge™ IEEE802.3af/802.3at (13-30W) PoE PD Controller with HV Isolation, Quad DC-DC Outputs with I2C based Management & Diagnostics

The AS1854 integrates Akros GreenEdge™ Isolation technology with next generation Power-over-Ethernet (PoE) PD and power conversion technology to deliver groundbreaking power integration, and enable a new range of Digital Power PoE PD capabilities and solutions.      

A Type 1 (IEEE® 802.3af) and Type 2 (IEEE® 802.3at) compliant PD is integrated with high-voltage isolation and quad-output digital power DC-DC converters – resulting in a complete PoE & Power management solution in a single device with minimal external components for higher power systems requiring upto 30W power capability. 
In addition to enabling digital PoE power conversion, Akros GreenEdge™ isolation enables direct digital management of isolated Primary GPIO for real time Green Power application capabilities. The device includes a standard I2C based uController interface for advance programmability, monitoring, alarms, diagnostics and management support. The AS1854 is available in a 64-pin 9x9 QFN, Reduction of Hazardous Substance (RoHS)-compliant package.


The AS1854 is geared towards use in high-power, low-cost sytems that will greatly benefit from the GreenEdge Technology performane, integration, and feature enablement; and can enhance product features and benefits with advanced software programmability, monitoring and diagnostic features.

  • Voice-over-IP (VoIP) phones
  • Wireless LAN & WiMAX access points (WAP)
  • Pan, Tilt, Zoom (PTZ) Cameras, IP cameras
  • Thin-client and notebook computers
  • Fiber-to-the-home (FTTH) terminals
  • Point-of-sale (PoS) terminals, RFID readers



Digitally Isolated Programmable Power

   PoE PD Controller

  • Type 1 IEEE® 802.3af and Type2 IEEE® 802.3at Compliant PD for 13-30W applications
  • Automatic PoE-Plus (Type 2) detection in H/W and I2C Modes

   Primary-Side DC-DC Controller

  • High-efficiency DC-DC Controller with Digital Optimization
  • Primary-Secondary High-voltage integrated Digital Isolation
  • Programmable Primary Clock Frequency
  • Local-power operation down to 9.5V

  Secondary-Side Power Outputs

  • Programmable PWM Frequencies synched to External Clock
  • Output #1: Sync Controller with programmable power-FET timing for high efficiency at both light and full load
  • Outputs #2 & #3: Fully integrated Buck Regulators w/2A FETs
  • Output #4: DC-DC Controller for Buck, Boost, or LED Driver

 Power Management

  • Hardware programmable start-up power sequencing
  • Primary-side power monitoring & control from Secondary side
  • Individual output Power-Good management
  • Voltage margining for each output
  • Primary GPIO/ADC controlled via Secondary GPIO or I2C
  • 5V µC-compatible with interrupt on alarm services
  • Programmable watchdog timer

EMC Compliance and Protection

  • Slew-rate-controlled power drivers
  • Multi-phased PWM clocking, with External Sync clock option
  • Optional spread-spectrum clocking available for all PWMs
  • Over-current, Under/Over-voltage and Short-circuit Protection
  • High-temperature warning and shutdown
  • Meets IEC 61000-4-2/3/4/5/6, IEC60747, IEC 60950, DIN EN60747-5-2 (VDE0884), & UL1577 requirements for EMC compliance and basic isolation to 1500 VRMS



Block Diagram




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