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MAX5984AETI+ |MAX5984AETIMAXIMN/a2avaiSingle-Port, 40W, IEEE 802.3af/at PSE Controller with Integrated MOSFET


MAX5984AETI+ ,Single-Port, 40W, IEEE 802.3af/at PSE Controller with Integrated MOSFETApplications)PoE Repeaters PSE OUTPUTSwitches/RoutersAGNDIndustrial Automation EquipmentV-54V EEOUT ..
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MAX6001EUR-T ,Low-Cost / Low-Power / Low-Dropout / SOT23-3 Voltage ReferencesFeaturesThe MAX6001–MAX6005 family of SOT23, low-cost' 1% max Initial Accuracyseries voltage refere ..
MAX6001EUR-T ,Low-Cost / Low-Power / Low-Dropout / SOT23-3 Voltage ReferencesApplicationsOrdering InformationPortable/Battery-Powered EquipmentNotebook ComputersPIN- SOTPART TE ..
MAZ8220-H ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8220-L ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaMarking SymbolParameter Symbol Rating UnitRefer to the list of t ..
MAZ8220-M ,Silicon planar typeElectrical Characteristics T = 25°CaParameter Symbol Conditions Min Typ Max UnitForward voltage V ..
MAZ8240-H ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8240-L ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8240-M ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..


MAX5984AETI+
Single-Port, 40W, IEEE 802.3af/at PSE Controller with Integrated MOSFET
MAX5984
Single-Port, 40W, IEEE 802.3af/at PSE
Controller with Integrated MOSFET
19-6142; Rev 0; 12/11
Typical Operating Circuit
General Description
The MAX5984 is a single-port, power-sourcing equip-
ment (PSE) power controller designed for use in IEEE®
802.3af/at-compliant PSE. This device provides powered
device (PD) discovery, classification, current limit, and
DC and AC load-disconnect detections. The MAX5984
operates automatically without the need for any software
programming and features an integrated power MOSFET
and sense resistor. The device also supports new Class 5
and 2-Event classification for detection and classification
of high-power PDs. The MAX5984 provides up to 40W to
a single port (Class 5 enabled) and still provides high-
capacitance detection for legacy PDs.
The MAX5984 provides input undervoltage lockout
(UVLO), input overvoltage lockout, overtemperature
detection, output voltage slew-rate limit during startup,
and LED status indication.
The MAX5984 is available in a space-saving, 28-pin
TQFN (5mm x 5mm) power package, and is rated for the
extended (-40NC to +85NC) temperature range.
Applications
Single-Port PSE End-Point Applications
Single-Port PSE Power Injectors (Midspan
Applications)
PoE Repeaters
Switches/Routers
Industrial Automation Equipment
Wireless LAN Access Point/WiMAX® Base
Stations
Features
S IEEE 802.3af/at Compliant
S Up to 40W for Single-Port PSE Applications
S Integrated 0.5I Power MOSFET and Sense
Resistor
S 2-Event Pin-Select (MAX5984A/MAX5984B)
S PD Detection and Classification
S Programmable Current Limit for Class 5 PDs
S High-Capacitance Detection for Legacy Devices
S Supports Both DC and AC Load Removal
Detections
S Current Foldback and Duty Cycle-Controlled
Current Limit
S LED Indicator for Port Status
S Direct Fast-Shutdown Control Capability
S Space-Saving, 28-Pin TQFN (5mm x 5mm)
Package
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
**Future product—Contact factory for availability.
Ordering Information
IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.
EVALUATION KIT
AVAILABLE
-54V
AGND
LED
2-EVENT
VEE_DIG
VEE
LEGACY
MIDSPAN
OSC
OUT
OUTP
DET
ILIM1
ILIM2
MAX5984A
PSE OUTPUT
PARTPIN-
SELECTTEMP RANGEPIN-
PACKAGE
MAX5984AETI+2-EVENT-40NC to +85NC28 TQFN-EP*
MAX5984BETI+**2-EVENT-40NC to +85NC28 TQFN-EP*
MAX5984CETI+**PWMEN-40NC to +85NC28 TQFN-EP*
MAX5984DETI+LSCEN-40NC to +85NC28 TQFN-EP*
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
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.
(Voltages referenced to VEE, unless otherwise noted.)
AGND, DET, LED ..................................................-0.3V to +80V
OUT ......................................................-0.3V to (VAGND + 0.3V)
OUTP .......................................................-6V to (VAGND + 0.3V)
VEE_DIG ...............................................................-0.3V to +0.3V
OSC .........................................................................-0.3V to +6V
EN, 2-EVENT/PWMEN/LSCEN, MIDSPAN, LEGACY, ILIM1, ILIM2..........................................-0.3V to +4V
Maximum Current Into LED ................................................40mA
Maximum Current Into OUT .........................Internally regulated
Continuous Power Dissipation (TA = +70NC)TQFN (derate 34.5mW/NC above +70NC)...............2758.6mW
Operating Temperature Range ..........................-40NC to +85NC
Storage Temperature Range ............................-65NC to +150NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VAGND - VEE = 32V to 60V, TA = -40NC to +85NC, all voltages are referenced to VEE, unless otherwise noted. Typical values are at
VAGND - VEE = 54V, TA = +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
ABSOLUTE MAXIMUM RATINGS
Note 1: 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 /thermal-tutorial.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFNJunction-to-Ambient Thermal Resistance .......................29NCJunction-to-Case Thermal Resistance ..............................2NC
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLIES
Operating Voltage RangeVAGNDVAGND - VEE3260V
Supply CurrentIEEVOUT = VEE, all logic inputs unconnected,
measured at AGND in power mode2.54mA
CURRENT LIMIT
Current Limit ILIM
Maximum
ILOAD
allowed
during
current-limit
conditions,
VOUT = 0V
(Note 3)
Class 0, 1, 2, 3400420441
Class 4 684720756
Class 5 if ILIM1 = VEE, ILIM2
= unconnected807850893
Class 5 if ILIM1 =
unconnected, ILIM2 = VEE855900945
Class 5 if ILIM1 = VEE, ILIM2
= VEE902950998
Foldback Initial OUT VoltageVFLBK_STVAGND - VOUT below which the current
limit starts folding back27V
Foldback Final OUT VoltageVFLBK_ENDVAGND - VOUT below which the current
limit reaches ITH_FB10V
Minimum Foldback Current Limit
ThresholdITH_FBVOUT = VAGND166mA
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
ELECTRICAL CHARACTERISTICS (continued)
(VAGND - VEE = 32V to 60V, TA = -40NC to +85NC, all voltages are referenced to VEE, unless otherwise noted. Typical values are at
VAGND - VEE = 54V, TA = +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
OVERCURRENT
Overcurrent ThresholdICUT
Overcurrent
threshold
allowed for
t P tFAULT,
VOUT = 0V
(Note 3)
Class 0, 1, 2, 3351370389
Class 4 602634666
Class 5 if ILIM1 = VEE,
ILIM2 = unconnected710748785
Class 5 if ILIM1 =
unconnected, ILIM2 = VEE752792832
Class 5 if ILIM1 = VEE,
ILIM2 = VEE794836878
INTERNAL POWER
DMOS On-ResistanceRDS(ON)
Measured
from OUT to
VEE, IOUT =
100mA
TA = +25NC0.50.9
TA = +85NC0.61.3
Power-Off OUT Leakage CurrentIOUT_LEAKVEN = VEE, VOUT = VAGND10FA
SUPPLY MONITORS
VEE Undervoltage Lockout VEE_UVLOVAGND - VEE, VAGND increasing28.5V
VEE Undervoltage Lockout
HysteresisVEE_UVLOHPort is shutdown if: VAGND - VEE < VEE_
UVLO - VEE_UVLOH3V
VEE Overvoltage LockoutVEE_OVVAGND - VEE > VEE_OV, VAGND increasing62.5V
VEE Overvoltage Lockout
HysteresisVEE_OVH1V
Thermal Shutdown ThresholdTSHD
Port is shutdown and device resets if the
junction temperature exceeds this limit,
temperature increasing
+150NC
Thermal Shutdown HysteresisTSHDHTemperature decreasing20NC
OUTPUT MONITOR
OUT Input CurrentIBOUTVOUT = VAGND, probing phases6FA
Idle Pullup Current at OUTIDIS
OUTP discharge current, detection and
classification off, port shutdown,
VOUTP = VAGND - 2.8V
200265FA
Short to VEE Detection
ThresholdDCNTHVOUT - VEE, VOUT decreasing, enabled
during detection1.52.02.5V
Short to VEE Detection
Threshold HysteresisDCNHY220mV
LOAD DISCONNECT
DC Load-Disconnect ThresholdIDCTH
Minimum load current allowed before
disconnect (DC disconnect active),
VOUT = 0V7.510mACurrent into DET, for IDET < IACTH the
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
ELECTRICAL CHARACTERISTICS (continued)
(VAGND - VEE = 32V to 60V, TA = -40NC to +85NC, all voltages are referenced to VEE, unless otherwise noted. Typical values are at
VAGND - VEE = 54V, TA = +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Triangular Wave Peak-to-Peak
Voltage AmplitudeAMPTRWMeasured at DET, referred to AGND3.8544.2V
OSC Pullup/Pulldown CurrentsIOSCMeasured at OSC263239FA
ACD_EN ThresholdVACD_ENVOSC - VEE > VACD_EN to activate AC
disconnect270330380mV
Load Disconnect TimertDISC
Time from IRSENSE < IDCTH (DC
disconnect active) or IDET < IACTH (AC
disconnect active) to gate shutdown
300400ms
DETECTION
Detection Probe Voltage
(First Phase)VDPH1VAGND - VDET during the first detection
phase3.844.2V
Detection Probe Voltage
(Second Phase)VDPH2VAGND - VDET during the second
detection phase99.39.6V
Current-Limit ProtectionIDLIMVDET = VAGND during detection, measure
current through DET1.501.752.00mA
Short-Circuit ThresholdVDCP
If VAGND - VOUT < VDCP after the first
detection phase, a short circuit to AGND
is detectedV
Open-Circuit ThresholdID_OPENFirst point measurement current threshold
for open condition8FA
Resistor Detection WindowRDOK(Note 4)1926.5kI
Resistor Rejection WindowRDBADDetection rejects lower values15.5kIDetection rejects higher values32
CLASSIFICATION
Classification Probe Voltage VCLVAGND - VDET during classification1620V
Current-Limit ProtectionIClLIMVDET = VAGND, during classification
measure current through DET6580mA
Classification Current
ThresholdsICL
Classification
current
thresholds
between
classes
Class 0, Class 15.56.57.5
Class 1, Class 213.014.516.0
Class 2, Class 3212325
Class 3, Class 4313335
Class 4 upper limit (Note 5)454851
Mark Event VoltageVMARKVAGND - VDET during mark event810V
Mark Event Current LimitIMARK_LIMVDET = VAGND, during mark event
measure current through DET5580mA
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Note 2: This device is production tested at TA = +25NC. Limits at TA = -40NC and TA = +85NC are guaranteed by design.
Note 3: If ILIM1 and ILIM2 are both unconnected, Class 5 detection is disabled. See the Class 5 PD Classification section and Table 3 for
details and settings.
Note 4: RDOK = (VOUT2 - VOUT1)/(IDET2 - IDET1). VOUT1, VOUT2, IDET2, and IDET1 represent the voltage at OUT and the current at
DET during phase 1 and 2 of the detection, respectively.
Note 5: If Class 5 is enabled, this is the classification current thresholds from Class 4 to Class 5.
ELECTRICAL CHARACTERISTICS (continued)
(VAGND - VEE = 32V to 60V, TA = -40NC to +85NC, all voltages are referenced to VEE, unless otherwise noted. Typical values are at
VAGND - VEE = 54V, TA = +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DIGITAL INPUTS/OUTPUTS (Voltages referenced to VEE)
Digital Input LowVIL0.8V
Digital Input HighVIH2.4V
Internal Input Pullup CurrentIPUPullup current to internal digital supply to
set default values357FA
LED Output Low VoltageVLED_LOWILED = 10mA, PWM disabled, port power-on0.8V
LED Output LeakageILED_LEAKPWM disabled, shutdown mode,
VLED = 60V10FA
PWM Frequency25kHz
PWM Duty Cycle6.25%
TIMING
Startup TimetSTART
Time during which a current limit set to
420mA is allowed, starts when power is
turned on6070ms
Fault TimetFAULTMaximum allowed time for an overcurrent
condition set by ICUT after startup506070ms
Detection Reset TimetMETime allowed for the port voltage to reset
before detection starts8090ms
Detection TimetDETMaximum time allowed before detection is
completed330ms
Midspan Mode Detection DelaytDMID22.22.4s
Classification TimetCLASSTime allowed for classification1923ms
Mark Event TimeTime allowed for mark event7911ms
VEEUVLO Turn-On DelaytDLYTime VAGND must be above the VEEUVLO
thresholds before the device operates5.2ms
Restart TimertRESTARTTime the device waits before turning on
after an overcurrent fault
16 x
tFAULTms
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
DC DISCONNECT THRESHOLD
vs. TEMPERATURE
MAX5984 toc07
DC DISCONNECT THRESHOLD (mA)3510-15
FOLDBACK CURRENT-LIMIT THRESHOLD
vs. OUTPUT VOLTAGE
MAX5984 toc06
IRSENSE
(mA)2010
CLASS 4
CLASS 0, 1, 2, 3
INTERNAL FET RESISTANCE
vs. TEMPERATURE
MAX5984 toc05
TEMPERATURE (°C)
FET RESISTANCE (m3510-15
VEE OVERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5984 toc04
TEMPERATURE (°C)
OVERVOLTAGE LOCKOUT (V)35-1510
VEE UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5984 toc03
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT (V)3510-15
ANALOG SUPPLY CURRENT
vs. TEMPERATURE
MAX5984 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
MEASURED AT AGND
ANALOG SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX5984 toc01
VAGND - VEE (V)
SUPPLY CURRENT (mA)5248444036
MEASURED AT AGND
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
ZERO-CURRENT DETECTION WAVEFORM
WITH AC DISCONNECT ENABLED
MAX5984 toc13
0mA
VAGND - VOUT
20V/div
IOUT
100mA/div
ZERO-CURRENT DETECTION WAVEFORM
WITH DC DISCONNECT ENABLED
MAX5984 toc12
0mA
VAGND - VOUT
20V/div
IOUT
100mA/div
EN TO OUT TURN-OFF DELAY
MAX5984 toc11
100μs/div
0mA
VAGND - VOUT
20V/div
IOUT
200mA/div
VEN
5V/div
SHORT-CIRCUIT TRANSIENT RESPONSE
MAX5984 toc10
10μs/div
0mA
VAGND - VOUT
20V/div
IOUT
5A/div
SHORT-CIRCUIT RESPONSE TIME
MAX5984 toc09
20ms/div
0mA
VAGND - VOUT
20V/div
IOUT
200mA/div
OVERCURRENT TIMEOUT (240Ω TO 138Ω)
MAX5984 toc08
20ms/div
0mA
VAGND - VOUT
20V/div
IOUT
200mA/div
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
DETECTION WITH INVALID PD (OPEN CIRCUIT)
MAX5984 toc16d
100ms/div
0mA
VAGND - VOUT
5V/div
IOUT
1mA/div
DETECTION WITH INVALID PD (33kΩ)
MAX5984 toc16c
100ms/div
0mA
VAGND - VOUT
5V/div
IOUT
1mA/div
DETECTION WITH INVALID PD (15kΩ)
MAX5984 toc16b
100ms/div
0mA
VAGND - VOUT
5V/div
IOUT
1mA/div
DETECTION WITH INVALID PD (25kΩ TO 10μF)
MAX5984 toc16a
40ms/div
0mA
VAGND - VOUT
1V/div
IOUT
1mA/div
STARTUP WITH A VALID PD
MAX5984 toc15
100ms/div
0mA
VAGND - VOUT
20V/div
IOUT
100mA/div
OVERCURRENT RESTART DELAY
MAX5984 toc14
400ms/div
0mA
VAGND - VOUT
20V/div
IOUT
200mA/div
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
CLASSIFICATION WITH DIFFERENT PD CLASSES
(4 AND 5)
MAX5984 toc20b
0mA
VAGND - VOUT
10V/div
IOUT
20mA/div
CLASS 5
CLASS 4
CLASSIFICATION WITH DIFFERENT PD CLASSES
(0 TO 3)
MAX5984 toc20a
0mA
VAGND - VOUT
10V/div
IOUT
10mA/div
CLASS 3
CLASS 2
CLASS 1
CLASS 0
DETECTION IN OUTPUT SHORTED TO AGND
MAX5984 toc19
40ms/div
0mA
VAGND - VOUT
5V/div
IOUT
1mA/div
DETECTION IN MIDSPAN WITH INVALID PD (33kΩ)
MAX5984 toc18b
400ms/div
0mA
VAGND - VOUT
5V/div
IOUT
1mA/div
DETECTION IN MIDSPAN WITH INVALID PD (15kΩ)
MAX5984 toc18a
400ms/div
0mA
VAGND - VOUT
5V/div
IOUT
1mA/div
STARTUP IN MIDSPAN WITH A VALID PD
MAX5984 toc17
100ms/div
0mA
VAGND - VOUT
20V/div
IOUT
100mA/div
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
LED PWM TIMING AND DUTY CYCLE
MAX5984 toc24
10µs/div
0mA
VAGND - VOUT
50V/div
VAGND - VLED
20V/div
IOUT
500mA/div
LED OVERCURRENT FAULT WITH PWM DISABLED
MAX5984 toc23b
200ms/div
0mA
VAGND - VOUT
50V/div
VAGND - VLED
20V/div
IOUT
500mA/div
LED OVERCURRENT FAULT WITH PWM ENABLED
MAX5984 toc23a
200ms/div
0mA
VAGND - VOUT
50V/div
VAGND - VLED
20V/div
IOUT
500mA/div
LED DETECTION FAULT WITH PWM DISABLED
MAX5984 toc22b
200ms/div
0mA
VAGND - VOUT
10V/div
VAGND - VLED
20V/div
IOUT
500mA/div
LED DETECTION FAULT WITH PWM ENABLED
MAX5984 toc22a
200ms/div
0mA
VAGND - VOUT
10V/div
VAGND - VLED
20V/div
IOUT
500mA/div
STARTUP USING 2-EVENT CLASSIFICATION
WITH A VALID PD
MAX5984 toc21
100ms/div
0mA
VAGND - VOUT
20V/div
IOUT
100mA/div
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Pin Description
Pin Configuration
ILIM1ILIM2
2-EVENT/PWMEN/LSCEN
MIDSPAN
N.C.N.C.LEDAGNDN.C.I.C.
OUTP672119171615
OUT
OUT
VEE_DIG
I.C.
I.C.
I.C.
MAX5984
OSC8N.C.I.C.
N.C.13LEGACYDET14EN
*EXPOSED PAD, CONNECT TO AGND.
*EP
N.C.
THIN QFN
TOP VIEW
PINNAMEFUNCTION
1, 2, 3VEEAnalog Low-Side Supply Input. Bypass with an external 100V, 47FF capacitor in parallel with a
100V, 0.1FF ceramic capacitance between AGND and VEE.ILIM1
Class 5 Current-Limit Digital Adjust 1. Referenced to VEE. ILIM1 is internally pulled up to the digital
supply. Use ILIM1 with ILIM2 to enable Class 5 operation and to adjust the Class 5 current-limit
value. See the Electrical Characteristics table and Table 3 for details.ILIM2
Class 5 Current-Limit Digital Adjust 2. Referenced to VEE. ILIM2 is internally pulled up to the digital
supply. Use ILIM2 with ILIM1 to enable Class 5 operation and to adjust the Class 5 current-limit
value. See the Electrical Characteristics table and Table 3 for details.
2-EVENT
(MAX5984A/
MAX5984B)
2-Event Classification Select. Referenced to VEE. 2-EVENT is internally pulled up to the digital
supply. Leave unconnected to disable 2-Event classification. Force low to enable the 2-Event
classification. See the 2-Event PD Classification section for more details. Change status of this
bit only when the part is in reset state. The MAX5984C/MAX5984D are enabled.
PWMEN
(MAX5984C)
PWM Control Logic Input. Referenced to VEE. PWMEN is internally pulled up to the digital supply.
Leave unconnected to enable the internal PWM to drive the LED pin. Force low to disable the
internal PWM. The MAX5984A/MAC5984B/MAX5984D are enabled.
LSCEN
(MAX5984D)
Load Stability Check Function Select. Referenced to VEE. LSCEN is internally pulled up to the
digital supply. Leave unconnected to enable the load stability check function. Force low to disable
the load stability check function. Change status of this bit only when the part is in reset state.
The MAX5984A is disabled but the MAX5984B/MAX5984C are enabled.
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