MAX5940A-MAX5940B Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX5940A-MAX5940B

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

Maxim Integrated 

IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

ABSOLUTE MAXIMUM RATINGS

(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

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.

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)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP MAX UNITS

DETECTION MODE

Input Offset Current (Note 2)

IOFFSET VIN = 1.4V to 10.1V

10

µA

Effective Differential Input

Resistance (Note 3)

dR

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

OUT = PGOOD = GND

550

kΩ

CLASSIFICATION MODE

Classification Current Turn-Off

Threshold (Note 4)

VTH,CLSS VIN rising

20.8 21.8 22.5

V

Classification Current (Notes 5, 6)

POWER MODE

ICLASS

VIN = 12.6V to

20V, RDISC =

25.5kΩ

Class 0, RCL = 10kΩ

Class 1, RCL = 732Ω

Class 2, RCL = 392Ω

Class 3, RCL = 255Ω

Class 4, RCL = 178Ω

0

9.17

17.29

26.45

36.6

2

11.83

19.71 mA

29.55

41.4

Operating Supply Voltage

Operating Supply Current

Default Power Turn-On Voltage

VIN

VIN = (GND - VEE)

67

V

IIN

Measure at GND, not including RDISC

0.4

1

mA

MAX5940A

34.3 35.4 36.6

VUVLO, ON VIN increasing MAX5940B, UVLO = VEE

37.4

38.6

39.9

V

Default Power Turn-Off Voltage

VUVLO, OFF

VIN decreasing, UVLO = VEE for

MAX5940B

30

V

Default Power Turn-On/Off

VHYST, MAX5940A

4.2

V

Hysteresis

UVLO MAX5940B, UVLO = VEE

7.4

External UVLO Programming

Range

VIN,EX

Set UVLO externally (MAX5940B only)

(Note 7)

12

67

V

UVLO External Reference Voltage VREF, UVLO

2.400 2.460 2.522

V

UVLO External Reference Voltage

Hysteresis

HYST Ratio to VREF,UVLO

19.2

20

20.9

%

UVLO Bias Current

IUVLO UVLO = 2.460V

-1.5

+1.5 µA

2 _______________________________________________________________________________________

Share Link: