Datasheet

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IEEE 802.3af/at-Compliant, Powered Device Interface

Controllers with Integrated 70W High-Power MOSFET

MAX5982A/MAX5982B/MAX5982C

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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 cur-

rent 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

compensate for twisted-pair cable resistive drop and to

assure glitch-free transition during power-on/-off condi-

tions. The MAX5982A/MAX5982B/MAX5982C can with-

stand 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 -40NC to +85NC extended

temperature range.

Features

S 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

WiMAXK Base Stations

19-5960; Rev 0; 6/11

WiMAX is a trademark of WiMAX Forum.

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

Ordering Information appears at end of data sheet.

Summary of content (17 pages)

PAGE 1
9-5960; Rev 0; 6/11 IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET Features The MAX5982A/MAX5982B/MAX5982C provide a complete 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, classification signature, and an integrated isolation power switch with inrush current control.
PAGE 2
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 = +70NC) (Note 1) TQFN (derate 28.
PAGE 3
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET (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 = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 60 V 0.25 0.55 mA 35.4 36.
PAGE 4
MAX5982A/MAX5982B/MAX5982C IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET ELECTRICAL CHARACTERISTICS (continued) (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 = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 5
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET TA = -40°C 25.0 24.5 0.1 TA = +25°C TA = +85°C MAX5982A toc03 25.5 5 4 3 2 TA = +85°C 1 0 -1 -2 TA = +25°C -3 TA = -40°C -4 -5 24.0 0 2 4 6 8 0 10 2 4 8 CLASSIFICATION CURRENT vs. INPUT VOLTAGE CLASS 5 IIN (mA) 4 8 10 2.0 TA = -40°C CLASS 4 CLASS 3 VIN 5V/div 1.6 IIN 100mA/div 1.2 TA = +25°C TA = +85°C 0.
PAGE 6
Typical Operating Characteristics (continued) (VIN = (VDD - VSS) = 54V, RDET = 24.9kω, RCLS = 615ω, and RSL = 60.4kω. RTN, WAD, PG, 2EC, WK, and ULP unconnected; all voltages are referenced to VSS.) INRUSH CONTROL WAVEFORM WITH TYPE 2 CLASSIFICATION INRUSH CONTROL WAVEFORM WITH TYPE 2 CLASSIFICATION MAX5982A toc10 MAX5982A toc11 VIN 50V/div VIN 50V/div V2EC 50V/div VPG 50V/div VRTN 50V/div V2EC 50V/div VRTN 50V/div IRTN 100mA/div IRTN 100mA/div 400µs/div LED CURRENT vs.
PAGE 7
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET 11 2EC VDD 2 10 PG DET 3 9 WAD I.C. 4 N.C. LED N.C. SL N.C. WK N.C. ULP *EP 1 + MAX5982C *EP 5 6 7 8 5 6 7 12 CLS 11 2EC 10 PG 9 WAD 8 RTN 4 N.C. 13 RTN I.C. MAX5982A MAX5982B CLS 14 VSS 3 12 15 VSS DET + 16 RTN 2 13 RTN VDD 14 VSS 1 15 VSS N.C. 16 TOP VIEW TQFN TQFN *CONNECT EP TO VSS.
PAGE 8
MAX5982A/MAX5982B/MAX5982C IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET Pin Description (continued) PIN MAX5982A/ MAX5982B MAX5982C NAME FUNCTION 11 11 2EC 2-Event Classification Detect or Wall Adapter Detect Output. A 1.5mA current sink is enabled at 2EC when a Type 2 PSE or a wall adapter is detected. When powered by a Type 2 PSE, the 2EC current sink is enabled after the isolation MOSFET is fully on until VIN drops below the UVLO threshold.
PAGE 9
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET VDD VDD EN CLS CLASSIFICATION VDD 2EC D SET Q CLR Q D SET Q CLR Q 5V REGULATOR 1.5mA VDD 5V PG 46µA DET VON/VOFF VDD 230µA VDD THERMAL SHUTDOWN WAD R S Q 9V tDELAY ISWITCH VSS RTN ISOLATION SWITCH K x ISWITCH S I0 1/K I1 MUX MAX5982A MAX5982B SL 5V 2.
PAGE 10
MAX5982A/MAX5982B/MAX5982C IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET MAX5982C Simplified Block Diagram VDD VDD EN CLS CLASSIFICATION VDD 2EC D SET Q CLR Q D SET Q CLR Q 5V REGULATOR 1.
PAGE 11
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET 2-EVENT CLASSIFICATION DETECTION GND 2EC VDD RJ-45 AND BRIDGE RECTIFIER DET MAX5982A MAX5982B MAX5982C 1.5mA DC-DC CONVERTER WAD 24V/48V BATTERY RCLS IN- VSS -54V ENABLE 2EC/WAD CLS SMAJ58A GND PG RDET 24.
PAGE 12
MAX5982A/MAX5982B/MAX5982C IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET Detailed Description Operating Modes Depending on the input voltage (VIN = VDD - VSS), the MAX5982A/MAX5982B/MAX5982C operate in four different modes: PD detection, PD classification, mark event, and PD power. The devices enter PD detection mode when the input voltage is between 1.4V and 10.1V. The device enters PD classification mode when the input voltage is between 12.
PAGE 13
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET Power Mode (Wake Mode) The MAX5982A/MAX5982B/MAX5982C enter power mode when VIN rises above the undervoltage-lockout threshold (VON). When VIN rises above VON, the MAX5982A/MAX5982B/MAX5982C turn on the internal n-channel isolation MOSFET to connect VSS to RTN with inrush current limit internally set to 53mA when VRTN VSS > 7V and 135mA when VRTN - VSS < 7V.
PAGE 14
MAX5982A/MAX5982B/MAX5982C IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET Applications Information 2) Use large SMT component pads for power dissipating devices such as the MAX5982A/MAX5982B/ MAX5982C and the external diodes. Operation with 12V Adapter Layout Procedure Careful PCB layout is critical to achieve high efficiency and low EMI. Follow these layout guidelines for optimum performance: 3) Use short and wide traces for high-power paths.
PAGE 15
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET ISOLATED 2-EVENT CLASSIFICATION OUTPUT GND GND 2EC VDD 2EC/WAD VAC DET 68nF CLS SMAJ58A VAC WAD MAX5982A MAX5982B MAX5982C 1.4mA 24/48V BATTERY 43.7I VSS -54V GND CBULK NT RIN D2 CIN L2 RTN RTN D3 RDCLMP1 T1 NP IN PG RTN RTN D1 L1 RTN PG PG 24.
PAGE 16
MAX5982A/MAX5982B/MAX5982C IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET Ordering Information PART SLEEP/ULTRA-LOWPOWER MODE 6s FILTER DELAY ON SL 16 TQFN-EP* Yes Yes 16 TQFN-EP* Yes No 16 TQFN-EP* No –– TEMP RANGE PIN-PACKAGE MAX5982AETE+ -40NC to +85NC MAX5982BETE+ -40NC to +85NC MAX5982CETE+ -40NC to +85NC +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
PAGE 17
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated 70W High-Power MOSFET REVISION NUMBER REVISION DATE 0 6/11 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.