MAX5971BETI+ datasheet(4/46 Pages) MAXIM

Part #	MAX5971BETI+

Description	Single-Port, 40W, IEEE 802.3af/at, PSE Controller with I2C

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Manufacturer	MAXIM [Maxim Integrated Products]

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4 ______________________________________________________________________________________

Single-Port, 40W, IEEE 802.3af/at,

PSE Controller with I2C

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)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LOAD DISCONNECT

DC Load-Disconnect Threshold

IDCTH

Minimum load current allowed before

disconnect (DC disconnect active),

VOUT = 0V

5

7.5

10

mA

AC Load-Disconnect Threshold

(Note 4)

IACTH

Current into DET, for IDET < IACTH the port

powers off (AC disconnect active)

115

130

145

F

A

Triangular Wave Peak-to-Peak

Voltage Amplitude

AMPTRW

Measured at DET, referred to AGND

3.85

4

4.2

V

OSC Pullup/Pulldown Currents

IOSC

Measured at OSC

26

32

39

F

A

ACD_EN Threshold

VACD_EN

VOSC - VEE > VACD_EN to activate AC

disconnect

270

330

380

mV

Load-Disconnect Timer

tDISC

Time from IRSENSE < IDCTH (DC

disconnect active) or IDET < IACTH (AC

disconnect active) to gate shutdown

(Note 5)

300

400

ms

DETECTION

Detection Probe Voltage

(First Phase)

VDPH1

VAGND - VDET during the first detection

phase

3.8

4

4.2

V

Detection Probe Voltage

(Second Phase)

VDPH2

VAGND - VDET during the second detection

phase

9

9.3

9.6

V

Current-Limit Protection

IDLIM

VDET = VAGND during detection, measure

current through DET

1.50

1.75

2.00

mA

Short-Circuit Threshold

VDCP

If VAGND - VOUT < VDCP after the first

detection phase a short circuit to AGND is

detected.

1

V

Open-Circuit Threshold

ID_OPEN

First point measurement current threshold

for open condition

20

F

A

Resistor Detection Window

RDOK

(Note 6)

19

26.5

kI

Resistor Rejection Window

RDBAD

Detection rejects lower values

15.5

kI

Detection rejects higher values

32

CLASSIFICATION

Classification Probe Voltage

VCL

VAGND - VDET during classification

16

20

V

Current-Limit Protection

IClLIM

VDET = VAGND, during classification

measure current through DET

65

80

mA

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