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MAX5982A/MAX5982B/
MAX5982C
EVALUATION KIT AVAILABLE
IEEE 802.3af/at-Compliant,
Powered Device Interface Controllers with
Integrated 70W High-Power MOSFET
General Description
The MAX5982A/MAX5982B/MAX5982C provide a com-
plete interface for a powered device (PD) to comply with
the IEEE® 802.3af/at standard in a power-over-Ethernet
(PoE) system. The MAX5982A/MAX5982B/MAX5982C
provide the PD with a detection signature, classifica-
tion signature, and an integrated isolation power switch
with inrush current control. During the inrush period, the
MAX5982A/MAX5982B/MAX5982C limit the current to
less than 182mA before switching to the higher current
limit (1700mA to 2100mA) when the isolation power
MOSFET is fully enhanced. The devices feature an input
UVLO with wide hysteresis and long deglitch time to com-
pensate for twisted-pair cable resistive drop and to assure
glitch-free transition during power-on/-off conditions. The
MAX5982A/MAX5982B/MAX5982C can withstand up to
100V at the input.
The MAX5982A/MAX5982B/MAX5982C support a
2-Event classification method as specified in the IEEE
802.3at standard and provide a signal to indicate when
probed by a Type 2 power sourcing equipment (PSE).
The devices detect the presence of a wall adapter power
source connection and allow a smooth switchover from
the PoE power source to the wall power adapter.
The MAX5982A/MAX5982B/MAX5982C also provide a
power-good (PG) signal, two-step current limit and fold-
back, overtemperature protection, and di/dt limit. A sleep
mode feature in the MAX5982A/MAX5982B provides low
power consumption while supporting Maintain Power
Signature (MPS). An ultra-low-power sleep mode feature
in the MAX5982A/MAX5982B further reduces power
consumption while still supporting MPS. The MAX5982A/
MAX5982B also feature an LED driver that is automati-
cally activated during sleep mode.
The MAX5982A/MAX5982B/MAX5982C are available
in a 16-pin, 5mm x 5mm, TQFN power package. These
devices are rated over the -40°C to +125°C extended
temperature range.
Features
●● Sleep Mode and Ultra-Low-Power Sleep
(MAX5982A/MAX5982B)
●● 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 182mA Maximum
●● Current Limit During Normal Operation Between
1700mA and 2100mA
●● Current Limit and Foldback
●● Legacy UVLO at 36V
●● LED Driver with Programmable LED Current
(MAX5982A/MAX5982B)
●● 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
Ordering Information appears at end of data sheet.
WiMAX is a trademark of WiMAX Forum.
IEEE is a registered service mark of the Institute of Electrical
and Electronics Engineers, Inc.
19-5960; Rev 1; 3/19
