Kinetic Technology


13W/30W IEEE 802.3af/at PoE Powered Device with Integrated DC-DC Controller

Topology: Flyback
Input Voltage (min.): 9.50 V
Input Voltage (max.): 57.00 V
Switching Frequency (min.): 80.00 kHz
Switching Frequency (max.): 550.00 kHz

Original publication on 2011-03-01, revision 1.4


The AS1135 is a single-chip, highly integrated CMOS solutionfor Power over Ethernet (PoE) Powered Devices requiring input power of up to 30Watts. Applications include Voiceover IP (VoIP) Phones, Wireless LAN Access Point, SecurityCameras, WiMax Terminals, Point-of-Sales Terminals, RFID Readers, Thin Clients and Notebook computers.The AS1135 integrates input surge protection, a PD controllerand a low-emission DC-DC controller. The AS1135 implementsall of the physical layer Powered Device (PD) functionality, asrequired by IEEE® 802.3af-2005 and IEEE® 802.3at-2009standards. This includes 2-event classification, Type 2 PSEdetection indicator (ATDET), PD detection, under-voltage lockout (UVLO), and Hot-Swap FET integration.The AS1135 has been architected to address both EMemissionconcerns and surge/over-voltage protection in PoE applications.The chip implements many design features that minimizetransmission of system common-mode noise onto theUnshielded Twisted Pair (UTP). On-chip integrationof surge protection provides faster response to surge events and limits stray surge current from passing through sensitive circuits, such as the Ethernet PHY. The device is designed to provide safe, low-impedance discharge paths directly to the earthground, resulting in superior reliability and circuit protection.By using high-volume standard CMOS technology, Akros enables its customers to implement higher-performance PoEdevices with low cost and a small footprint.


  • Full support of both IEEE® Std. 802.3af-2005 and IEEE® Std. 802.3at-2009 power requirements
  • “2-Event” classification for 802.3at higher power PDs
  • Robust Type 2 PSE detector with proprietary digital filtering for line noise to eliminate false positives
  • IEC 61000-4-2/3/4/5/6 requirements for EMCCompliance
  • Integrated Surge Protection for 15kV/8kV Systemlevel ESD Compliance
  • Integrated DC-DC controller for exceptional EMIperformance
  • Programmable DC current limit up to 720mA for 30Wapplications
  • Seamless support for local power, down to 9.5V
  • Implemented in robust 100V automotive process
  • Low Rds-on Hot-Swap FET (typical 0.8Ω)
  • Over temperature protection
  • Industrial temperature range,
  • 40º to +85ºC
  • 5x5 mm, 20 lead QFN Package, RoHS compliant


Order Code SPEC Product series Samples
750310925 PDF
750310926 PDF
750310927 PDF