MAX5980GTJ+ datasheet(3/49 Pages) MAXIM

Part #	MAX5980GTJ+

Description	Quad, IEEE 802.3at/af PSE Controller

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Manufacturer	MAXIM [Maxim Integrated Products]

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3 / 49 page

Quad, IEEE 802.3at/af PSE Controller

for Power-over-Ethernet

3

ELECTRICAL CHARACTERISTICS (continued)

(VAGND = 32V to 60V, VEE = VDGND = 0V, TA = -40NC to +105NC. All voltages are referenced to VEE, unless otherwise noted. Typical

values are at VAGND = 54V, TA = +25NC, and default register settings. Currents are positive when entering the pin, and negative

otherwise.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Overcurrent Threshold after

Startup

VCUT

Overcurrent VSENSE_

threshold allowed for

t P tFAULT after startup,

VOUT_ = 0V

ICUT_ register

set to 14h,

Class 0 and 3

89

93.75

98.5

mV

ICUT_ register

set to 22h,

Class 4

178

187.5

197

ICUT_ register

set to 22h,

Class 5

356

375

394

Foldback Initial Voltage

VFLBK_ST

VAGND - VOUT_ above

which the current-limit trip

voltage starts folding back

ILIM register

set to 80h

32

V

ILIM register

set to C0h

18

Foldback Final Voltage

VFLBK_END

VAGND - VOUT_ above which the current

limit reaches VTH_FB

46

V

Minimum Foldback Current-Limit

Threshold

VTH_FB

VOUT_ = VAGND = 60V

35

mV

SENSE_ Input Bias Current

VSENSE_ = VEE

-2

F

A

SUPPLY MONITORS

VEE Undervoltage Lockout

VEE_UVLO VAGND - VEE, VAGND - VEE increasing

29

V

VEE Undervoltage Lockout

Hysteresis

VEE_UVLOH

Ports shut down if: VAGND - VEE <

VEE_UVLO - VEE_UVLOH

3

V

VEE Overvoltage Lockout

VEE_OV

Ports shut down if: VAGND - VEE > VEE_OV,

VAGND - VEE increasing

62

V

VEE Overvoltage-Lockout

Hysteresis

VEE_OVH

1

V

VEE Undervoltage

VEE_UV

VEE_UV event bit sets if: VAGND - VEE <

VEE_UV, VAGND - VEE increasing

40

V

VDD Output Voltage

VDD

IDD = 0 to 10mA

3.0

3.3

3.6

V

VDD Undervoltage Lockout

VDD_UVLO

2

V

Thermal-Shutdown Threshold

TSHD

Port is shut down and device resets if the

junction temperature exceeds this limit,

temperature increasing (Note 4)

+140

N

C

Thermal-Shutdown Hysteresis

TSHDH

Temperature decreasing (Note 4)

20

N

C

OUTPUT MONITOR

OUT_ Input Current

IBOUT

VOUT_ = VAGND, during idle

2

F

A

VAGND - VEE = 48V, VOUT_ = VEE, during

power-on mode

-70

Idle Pullup Resistance at OUT_

RDIS

Detection and classification off, port

shut down

0.7

1

1.25

MI

PGOOD High Threshold

PGTH

VOUT_ - VEE, OUT_ decreasing

1.5

2.0

2.5

V

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