MAX5945 datasheet(4/44 Pages) MAXIM

4 / 44 page

Quad Network Power Controller

for Power-Over-LAN

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AGND = +32V to +60V, VEE = 0V, VDD to DGND = +3.3V, all voltages are referenced to VEE, unless otherwise noted. Typical

values are at AGND = +48V, DGND = +48V, VDD = (DGND + 3.3V), TA = +25°C. Currents are positive when entering the pin and

negative otherwise.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

AC Load Disconnect

Threshold (Note 4)

IACTH

Current into DET_, ACD_EN_ bit = high,

OSC_IN = 2.2V

300

325

350

µA

Oscillator Buffer Gain

AOSC

VDET_ / VOSC_IN, ACD_EN_ bit = high,

CDET = 400nF

2.92

2.98

3.04

V/V

OSC_IN Fail Threshold

(Note 5)

VOSC_FAIL

Port will not power on if VOSC_IN < VOSC_FAIL and

ACD_EN_ bit = high

1.8

1.9

2.1

OSC_IN Input Resistance

ZOSC

OSC_IN input impedance when all the ACD_EN_

are active

100

Ω

OSC_IN Input Capacitance

COSC_IN

5pF

Load Disconnect Timer

tDISC

Time from VSENSE < VDCTH or current into DET_

< IACTH to gate shutdown (Note 6)

300

400

DETECTION

Detection Probe Voltage

(First Phase)

VDPH1

VAGND - VDET_ during the first detection phase

3.8

4.2

Detection Probe Voltage

(Second Phase)

VDPH2

VAGND - VDET_ during the second detection

phase

9.0

9.3

9.6

Current-Limit Protection

IDLIM

VDET_ = VAGND, during detection, measure

current through DET_

1.5

1.75

2.0

Short-Circuit Threshold

VDCP

If VAGND - VOUT < VDCP after the first detection

phase a short circuit to AGND is detected

1.62

Open-Circuit Threshold

ID_OPEN

First point measurement current threshold for

open condition

12.5

µA

Resistor Detection Window

RDOK

(Note 7)

18.6

26.5

Ω

Detection rejects lower values

Resistor Rejection Window

RDBAD

Detection rejects higher values

Ω

CLASSIFICATION

Classification Probe Voltage

VCL

VAGND - VDET_ during classification

Current-Limit Protection

IClLIM

VDET_ = VAGND, during classification,

measure current through DET_

Class 0, class 1

5.5

6.5

7.5

Class 1, class 2

13.5

14.5

15.5

Class 2, class 3

21.5

24.5

Class 3, class 4

Classification Current

Thresholds

ICL

Classification current

thresholds between

classes

>Class 4

DIGITAL INPUTS/OUTPUTS (REFERRED to DGND)

Digital Input Low

VIL

0.9

Digital Input High

VIH

2.4

MAX5945 Datasheet(PDF) 4 Page - Maxim Integrated Products

MAX5945 Datasheet(HTML) 4 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL