AS1844

GreenEdge™ IEEE802.3af/802.3at (13W-30W) PoE PD Controller with HV Isolation and Quad DC-DC outputs

The AS1844 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 Type2 (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 PoE powered systems upto 30W.

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 AS1844 is available in a 64-pin 9x9 QFN, Reduction of Hazardous Substance (RoHS)-compliant package.

Applications

The AS1844 is geared towards use in high-power, low-cost sytems that will greatly benefit from the GreenEdge Technology performane, integration, and feature enablement, without the need for 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

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Features

Digitally Isolated Programmable Power

PoE PD Controller

Type 1 IEEE^® 802.3af and Type2 IEEE^® 802.3at Compliant PD for upto 30W applications
Automatic PoE-Plus (Type2) detection with Secondary-side isolated indicator

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
Power-Good management
Primary GPIO controlled via Secondary GPIO

EMC Compliance and Protection

Slew-rate-controlled power drivers
Multi-phased PWM clocking, with External Sync clock option
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

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