MAX5940BESA datasheet(2/15 Pages) MAXIM

2 / 15 page

IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = (GND - VEE) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = VEE, TA = -40

°C to +85°C, unless otherwise noted.

Typical values are at TA = +25

°C. All voltages are referenced to VEE, unless otherwise noted.) (Note 1)

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.

(All voltages are referenced to VEE, unless otherwise noted.)

GND........................................................................-0.3V to +80V

OUT, PGOOD ...........................................-0.3V to (GND + 0.3V)

RCLASS, GATE ......................................................-0.3V to +12V

UVLO ........................................................................-0.3V to +8V

PGOOD to OUT.........................................-0.3V to (GND + 0.3V)

Maximum Input/Output Current (continuous)

OUT to VEE ...................................................................500mA

GND, RCLASS to VEE .....................................................70mA

UVLO, PGOOD, PGOOD to VEE .....................................20mA

GATE to VEE....................................................................80mA

Continuous Power Dissipation (TA = +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature ......................................................+150°C

Lead Temperature (soldering, 10s) ................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DETECTION MODE

Input Offset Current (Note 2)

IOFFSET

VIN = 1.4V to 10.1V

µA

Effective Differential Input

Resistance (Note 3)

VIN = 1.4V up to 10.1V with 1V step,

OUT = PGOOD = GND

550

Ω

CLASSIFICATION MODE

Classification Current Turn-Off

Threshold (Note 4)

VTH,CLSS

VIN rising

20.8

21.8

22.5

Class 0, RCL = 10k

Ω

Class 1, RCL = 732

Ω

9.17

11.83

Class 2, RCL = 392

Ω

17.29

19.71

Class 3, RCL = 255

Ω

26.45

29.55

Classification Current (Notes 5, 6)

ICLASS

VIN = 12.6V to

20V, RDISC =

25.5k

Ω

Class 4, RCL = 178

Ω

36.6

41.4

POWER MODE

Operating Supply Voltage

VIN

VIN = (GND - VEE)67

Operating Supply Current

IIN

Measure at GND, not including RDISC

0.4

MAX5940A

34.3

35.4

36.6

Default Power Turn-On Voltage

VUVLO, ON VIN increasing

MAX5940B, UVLO = VEE

37.4

38.6

39.9

Default Power Turn-Off Voltage

VUVLO, OFF

VIN decreasing, UVLO = VEE for

MAX5940B

MAX5940A

4.2

Default Power Turn-On/Off

Hysteresis

VHYST,

UVLO

MAX5940B, UVLO = VEE

7.4

External UVLO Programming

Range

VIN,EX

Set UVLO externally (MAX5940B only)

(Note 7)

UVLO External Reference Voltage

VREF, UVLO

2.400

2.460

2.522

UVLO External Reference Voltage

Hysteresis

HYST

Ratio to VREF,UVLO

19.2

20.9

UVLO Bias Current

IUVLO

UVLO = 2.460V

-1.5

+1.5

µA

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