MAX5940A datasheet(4/15 Pages) MAXIM

Part #	MAX5940A

Description	IEEE 802.3af PD Interface Controller For Power-Over-Ethernet

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Manufacturer	MAXIM [Maxim Integrated Products]

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IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

4

_______________________________________________________________________________________

IIN

IINi + 1

IINi

IOFFSET

dRi

1V

VINi

VINi + 1

IOFFSET

≅ IINi -

VINi

dRi

≅

(VINi + 1 - VINi)

=

1V

(IINi + 1 - IINi)

VIN

Figure1 . Effective Differential Input Resistance/Offset Current

DETECTION CURRENT vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

8

6

4

2

0.1

0.2

0.3

0.4

0.5

0

010

RDISC = 25.5k

Ω

IIN + IRDISC

CLASSIFICATION CURRENT vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

25

20

15

10

5

10

20

30

40

50

0

030

CLASS 0

CLASS 1

CLASS 2

CLASS 3

CLASS 4

EFFECTIVE DIFFERENTIAL INPUT

RESISTANCE vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

10

8

6

4

2

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0

012

INPUT OFFSET CURRENT

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

9

7

5

3

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0

-3.5

111

NORMALIZED UVLO

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

0.992

0.994

0.996

0.998

1.000

1.002

1.004

1.006

1.008

1.010

0.990

-40

85

UVLO = VEE

PGOOD OUTPUT LOW VOLTAGE

vs. CURRENT

ISINK (mA)

15

10

5

50

100

150

200

250

0

020

Typical Operating Characteristics

(VIN = (GND - VEE) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = VEE (MAX5940B), TA = -40°C to +85°C. Typical values

are at TA = +25°C. All voltages are referenced to VEE, unless otherwise noted.)

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