Analog Devices / Maxim Integrated MAX5981A/MAX5981B PD Interface Controllers
Analog Devices MAX5981A/MAX5981B IEEE® 802.3af/at-Compliant, Powered Device (PD) Interface Controllers with Integrated Power MOSFET provide a complete interface for a PD to comply with the IEEE 802.3af/at standard in a power-over-ethernet (PoE) system. Analog Devices MAX5981x PD Interface Controllers provide the PD with a detection signature, a classification signature, and an integrated isolation power switch with inrush current control. MAX5981x supports a 2-Event classification method specified in the IEEE 802.3at standard and provides a signal to indicate when probed by a Type 2 power sourcing equipment (PSE).
This Analog Devices device detects the presence of a wall adapter power source connection and allows a smooth switchover from the PoE power source to the wall power adapter. Sleep mode and ultra-low power sleep mode features provide low power consumption while supporting Maintain Power Signature (MPS). MAX5891x PD Interface Controllers also feature an LED driver automatically activated during sleep mode. During sleep mode, the LED driver sources a periodic current (ILED) at 250Hz (MAX5981A) or 15.625kHz (MAX5981B).
Features
- Sleep mode and ultra-low power
- IEEE 802.3af/at compliant
- 2-Event classification or an external wall adapter indicator output
- Simplified wall adapter interface
- PoE classification 0-5
- 100V Input absolute maximum rating
- Inrush current limit of 180mA maximum
- Current limit during normal operation is between 720mA and 880mA
- Current limit and foldback
- Legacy UVLO at 36V
- LED driver with programmable LED current
- Overtemperature protection
- Thermally enhanced, 5mm x 5mm, 16-Pin TQFN
Applications
- IEEE 802.3af/at powered devices
- IP phones, wireless access nodes, IP security
- Cameras
- WiMAX™ base stations
Pin Configuration
Published: 2012-01-16
| Updated: 2023-04-13