MAX5953A datasheet(2/27 Pages) MAXIM

Part #	MAX5953A

Description	IEEE 802.3af PD Interface and PWM Controllers with Integrated Power MOSFETs

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Manufacturer	MAXIM [Maxim Integrated Products]

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IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = (V+ - VEE) = 48V, GATE = PGOOD = PGOOD = unconnected, GND = OUT, HVIN = V+, UVLO = VEE, TJ = 0°C to +125°C, unless

otherwise noted. Typical values are at TJ = +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.

V+ to VEE ................................................................-0.3V to +90V

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

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

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

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

HVIN, INBIAS, DRNH, XFRMRH,

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

BST to GND ........................................................... -0.3V to +95V

BST to XFRMRH .................................................... -0.3V to +12V

PGND to GND .......................................................-0.3V to +0.3V

DCUVLO, RAMP, CSS, OPTO, FLTINT, RCFF,

RTCT to GND..................................................... -0.3V to +12V

SRC, CS to GND...................................................... -0.3V to +6V

REGOUT, DRVIN to GND .......................................-0.3V to +12V

REGOUT to HVIN .................................................. -80V to +0.3V

REGOUT to INBIAS ............................................... -80V to +0.3V

PPWM to GND....................................-0.3V to (VREGOUT + 0.3V)

Maximum Input/Output Current (Continuous)

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

V+, RCLASS to VEE.........................................................70mA

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

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

REGOUT to GND ............................................................50mA

DRNH, XFRMRH, XFRMRL, SRC to GND (Average),

TJ = +125°C..................................................................0.9A

PPWM to GND ..............................................................±20mA

Continuous Power Dissipation* (TA = +70°C)

48-Pin TQFN 7mm X 7mm

(derate 27.8mW/°C above +70°C) .............................2222mW

θJA ................................................................................36°C/W

Operating Ambient Temperature Range ................0°C to +85°C

Operating Junction Temperature Range ..............0°C to +125°C

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

Storage Temperature Range .............................-60°C to +150°C

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWERED DEVICE (PD) INTERFACE

DETECTION MODE

Input Offset Current

IOFFSET

VIN = 1.4V to 10.1V (Note 2)

10

µA

Effective Differential Input

Resistance (Note 3)

dR

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

550

k

Ω

CLASSIFICATION MODE

Classification Current Turn-Off

Threshold

VTH,CLASS

VIN rising (Note 4)

20.8

21.8

22.5

V

Class 0, RRCLASS = 10k

Ω

02

Class 1, RRCLASS = 732

Ω

9.17

11.83

Class 2, RRCLASS = 392

Ω

17.29

19.71

Class 3, RRCLASS = 255

Ω

26.45

29.55

Classification Current

ICLASS

VIN = 12.6V

to 20V,

RDISC =

25.5k

Ω

(Notes 5, 6)

Class 4, RRCLASS = 178

Ω

36.6

41.4

mA

POWER MODE

Operating Supply Voltage

VIN

VIN = (V+ - VEE)67

V

Operating Supply Current

IIN

Measure at V+, not including RDISC,

GATE = VEE, HVIN = GND = OUT

0.4

1

mA

MAX5953A/MAX5953C

37.4

38.6

40.2

Default Power Turn-On Voltage

VUVLO, ON

VIN

increasing

MAX5953B/MAX5953D

34.3

35.4

36.9

V

Default Power Turn-Off Voltage

VUVLO,OFF

VIN decreasing, MAX5953A/MAX5953C

30

V

*As per JEDEC 51 standard.

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