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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5982B Datasheet

Powered Device Interface Controllers

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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


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5982B Datasheet

Powered Device Interface Controllers

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MAX5982A/MAX5982B/
MAX5982C
IEEE 802.3af/at-Compliant,
Powered Device Interface Controllers with
Integrated 70W High-Power MOSFET
Absolute Maximum Ratings
VDD to VSS...........................................................-0.3V to +100V
DET, RTN, WAD, PG, 2EC to VSS.......................-0.3V to +100V
CLS, SL, WK, ULP, LED to VSS..............................-0.3V to +6V
Maximum Current on CLS (100ms maximum)..................100mA
Continuous Power Dissipation (TA = +70°C) (Note 1)
TQFN (derate 28.6mW/°C above +70°C)
Multilayer Board.......................................................2285.7mW
Operating Temperature Range.......................... -40°C to +125°C
Maximum Junction Temperature......................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................ +260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Note 1: Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 specifications.
Package Thermal Characteristics (Note 2)
TQFN
Junction-to-Ambient Thermal Resistance (θJA)...........35°C/W
Junction-to-Case Thermal Resistance (θJC)...............2.7°C/W
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VIN = (VDD - VSS) = 48V, RDET = 24.9kΩ, RCLS = 615Ω, and RSL = 60.4kΩ. RTN, WAD, PG, 2EC, WK, and ULP unconnected, all
voltages are referenced to VSS, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 3)
PARAMETER
DETECTION MODE
Input Offset Current
Effective Differential Input
Resistance
CLASSIFICATION MODE
Classification Disable
Threshold
Classification Stability Time
SYMBOL
IOFFSET
dR
VTH,CLS
Classification Current
ICLASS
TYPE 2 (802.3at) CLASSIFICATION MODE
Mark Event Threshold
VTHM
Hysteresis on Mark Event
Threshold
CONDITIONS
MIN
VIN = 1.4V to 10.1V (Note 4)
VIN = 1.4V up to 10.1V with 1V step,
VDD = RTN = WAD = PG = 2EC (Note 5)
23.95
VIN rising (Note 6)
22.0
VIN = 12.5V to
20.5V, VDD =
RTN = WAD =
PG = 2EC
Class 0, RCLS = 615Ω
Class 1, RCLS = 117Ω
Class 2, RCLS = 66.5Ω
Class 3, RCLS = 43.7Ω
Class 4, RCLS = 30.9Ω
Class 5, RCLS = 21.3Ω
0
9.12
17.2
26.3
36.4
52.7
VIN falling
10.1
TYP
25.00
22.8
0.2
10.7
0.82
MAX
10
25.50
23.6
3.96
11.88
19.8
29.7
43.6
63.3
11.6
UNITS
µA
V
ms
mA
V
V
Mark Event Current
Reset Event Threshold
IMARK
VTHR
VIN falling to enter mark event, 5.2V ≤
VIN ≤ 10.1V
VIN falling
0.25
0.85
2.7 3.8 5.2
mA
V
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX5982B
Description Powered Device Interface Controllers
Maker Maxim Integrated
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MAX5982B Datasheet PDF






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