MAX5942A datasheet(2/24 Pages) MAXIM

Part #	MAX5942A

Description	IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices

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Manufacturer	MAXIM [Maxim Integrated Products]

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IEEE 802.3af Power-Over-Ethernet

Interface/PWM Controller for Power Devices

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = (GND - VEE) = 48V, GATE = PGOOD = PGOOD = OPEN, V- tied to OUT, V+ tied to GND, UVLO = VEE, TA = TMIN to TMAX,

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)

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

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

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

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

VDD to V-.................................................................-0.3V to +40V

VCC to V-..............................................................-0.3V to +12.5V

FB, NDRV, SS_SHDN, CS to V- ..................-0.3V to (VCC + 0.3V)

Maximum Input/Output Current (continuous)

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

GND, RCL to VEE ............................................................70mA

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

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

VDD, VCC.........................................................................20mA

NDRV Continuous ...........................................................25mA

NDRV (pulsed for less than 1µs) .......................................±1A

Continuous Power Dissipation (TA = +70°C)

16-Pin SO (derate 9.1mW/°C above +70°C)................727mW

Operating Temperature Ranges

MAX5942_CSE...................................................0°C to +70°C

MAX5942_ESE ................................................-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

PD INTERFACE

DETECTION MODE

Input Offset Current

IOFFSET

VIN = 1.4V to 10.1V (Note 2)

10

µA

Effective Differential Input

Resistance

dR

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

OUT = PGOOD = GND (Note 3)

550

k

Ω

CLASSIFICATION MODE

Classification Current Turn-Off

Threshold

VTH,CLSS

VIN rising (Note 4)

20.8

21.8

22.5

V

Class 0, RCL = 10k

Ω

02

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

ICLASS

VIN = 12.6V

to 20V, RDISC

= 25.5k

Ω

(Notes 5, 6)

Class 4, RCL = 178

Ω

36.6

41.4

mA

POWER MODE

Operating Supply Voltage

VIN

VIN = (GND - VEE)67

V

Operating Supply Current

IIN

Measure at GND, not including RDISC

0.4

1

mA

Default Power Turn-On Voltage

VUVLO,ON

VIN increasing, UVLO = VEE

37.4

38.6

40.1

V

Default Power Turn-Off Voltage

VUVLO,OFF VIN decreasing, UVLO = VEE

30

V

Default Power Turn-On/Off

Hysteresis

VHYST,UVLO

7.4

V

External UVLO Programming

Range

VIN,EX

Set UVLO externally (Note 7)

12

67

V

UVLO External Reference Voltage

VREF,UVLO VUVLO increasing

2.400

2.460

2.522

V

UVLO External Reference

Voltage Hysteresis

HYST

Ratio to VREF,UVLO

19.2

20

20.9

%

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